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EP1208065A1 - Method for recovering fluorinated emulsifiers from aqueous phases - Google Patents

Method for recovering fluorinated emulsifiers from aqueous phases

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Publication number
EP1208065A1
EP1208065A1 EP00954467A EP00954467A EP1208065A1 EP 1208065 A1 EP1208065 A1 EP 1208065A1 EP 00954467 A EP00954467 A EP 00954467A EP 00954467 A EP00954467 A EP 00954467A EP 1208065 A1 EP1208065 A1 EP 1208065A1
Authority
EP
European Patent Office
Prior art keywords
aqueous phase
emulsifier
concentration
exchange resin
nonionic surfactant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP00954467A
Other languages
German (de)
French (fr)
Inventor
Georg Burkard
Klaus Hintzer
Gernot Löhr
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dyneon GmbH
Original Assignee
Dyneon GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dyneon GmbH filed Critical Dyneon GmbH
Publication of EP1208065A1 publication Critical patent/EP1208065A1/en
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/547—Tensides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J41/00—Anion exchange; Use of material as anion exchangers; Treatment of material for improving the anion exchange properties
    • B01J41/04—Processes using organic exchangers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
    • C07C51/42—Separation; Purification; Stabilisation; Use of additives
    • C07C51/47—Separation; Purification; Stabilisation; Use of additives by solid-liquid treatment; by chemisorption

Definitions

  • the invention relates to the treatment of waste water, especially weakly contaminated waste water, which contain fluorinated emulsifiers, such as are used in the polymerization of fluorinated monomers, since they have no telogenic properties.
  • the salts preferably the alkali or ammonium salts, of perfluorinated or partially fluorinated alkane carboxylic acids or sulfonic acids are used. These compounds are produced by electrofluorination or by the telomerization of fluorinated monomers, which is very expensive. There has been no shortage of attempts to recover these valuable materials from waste water.
  • a process for the recovery of fluorinated carboxylic acids in usable form from contaminated starting materials is known from US Pat. No. 5,442,097, where necessary the fluorinated carboxylic acid is released from these materials in an aqueous medium with a sufficiently strong acid, and these are reacted with a suitable alcohol and distilled off the ester formed.
  • a polymerization liquor can be used as the starting material, in particular from so-called emulsion polymerization, in which the fluoropolymer is produced in the form of colloidal particles with the aid of relatively high amounts of emulsifier.
  • Polymerization liquor is the wastewater that is obtained when the fluoropolymer is isolated by coagulation (without further process steps such as washing). This The process has proven itself very well, but requires a certain concentration of fluorinated carboxylic acid in the starting material.
  • Carboxylic acids can also be carried out in the absence of alcohols.
  • the fluorocarboxylic acid is distilled off in the form of a highly concentrated azeotrope.
  • this method variant is not technically advantageous for energy reasons.
  • the resulting wastewater is also more polluted than before treatment.
  • DE-A-20 44 986 discloses a process for obtaining perfluorocarboxylic acids from dilute solution, the dilute solution of the perfluorocarboxylic acids being brought into adsorption contact with a weakly based anion exchange resin and thereby the perfluorocarboxylic acid contained in the solution to the anions - Exchange resin adsorbed, the anion exchange resin eluted with an aqueous ammonia solution and thus the adsorbed perfluorocarboxylic acid is converted into the eluent and finally the acid from the eluate is recovered.
  • relatively large amounts of dilute ammonia solution are required for complete elution and, moreover, this process is very time consuming.
  • fluorinated emulsifier acids which is characterized in that the solids finely divided in the waste water are stabilized with a surfactant or a surface-active substance and then the fluorinated emulsifier acids are bound to an anion exchange resin and the fluorinated emulsifier acids are eluted from this (WO -A-99/62830).
  • nonionic surfactants are used in a concentration of 100 to 400 mg / 1.
  • a process has now been found for recovering fluorinated emulsifiers from an aqueous phase, this aqueous phase containing small amounts of fluoropolymer particles and optionally further substances in addition to the emulsifier, an upper concentration value of a nonionic surface-active substance being determined, below which no further decrease in the Desorption of the emulsifier bound to an anion exchanger occurs, - the aqueous phase is adjusted to a concentration of nonionic surfactant between the upper concentration value determined in this way or a lower concentration which is still effective to avoid coagulation of the polymer particles, brings the aqueous phase thus adjusted into contact with an anionic exchange resin in order to effect adsorption of the emulsifier on the exchange resin and to release the emulsifier from the exchange resin.
  • the suitable concentration of nonionic surface-active agent depends on the type of polymer, on the surface-active agent and optionally on other substances contained in the aqueous phase. It is therefore advisable to determine the appropriate concentration limits on the nonionic surfactant for each wastewater to be treated. Usually a concentration of at most 10 ppm is sufficient, mostly a concentration in the range of 5 to 0.1 ppm.
  • fluoropolymers such as polytetrafluoroethylene, fluorothermoplastics and fluoroelastomers
  • the polymers are separated by coagulation, these being mechanically subject to high shear ratios or chemically by means of coagulation
  • the coagulated fluoropolymers are usually agglomerated and washed with water. This results in relatively high amounts of process waste water, namely usually about 5 to 10 t of waste water per 1 t
  • Fluoropolymer Fluoropolymer.
  • the fluorinated emulsifier is largely washed out and is thus found in the waste water.
  • the concentration is usually a few millimoles per liter, corresponding to about 1000 ppm.
  • the wastewater also contains chemicals from the polymerization, such as initiators and buffers, which are approximately of the same order of magnitude as the emulsifier, and very small amounts of fluoropolymer latex particles which have not been coagulated.
  • the proportion of these latex particles in the wastewater is usually less than 0.5% by weight.
  • Another advantage of the low concentrations of nonionic surfactant is the more effective separation of the latex particles from the anion-exchanged wastewater. These particles are advantageously coagulated with small amounts of organic flocculant, it being found that the amount of flocculant required increases with increasing concentration of nonionic surface-active agent.
  • the fluoropolymers obtained in this way, now loaded with small amounts of surface-active agent and flocculant, can be used in building materials and therefore do not have to be worked up or deposited in a complex manner.
  • oxethylates and oxpropylates of organic hydroxy compounds are suitable as nonionic surface-active agents, non-aromatic oxalkylates being preferred for reasons of environmental protection. Oxethylates of long-chain alcohols are therefore preferably used.
  • the organic flocculants are advantageously cationic products, for example polydiallyldimethylammonium chloride.
  • Cationic surfactants such as didecyldimethylammonium chloride can also be used to precipitate the nonionic stabilized latex particles.
  • their use on an industrial scale is problematic because, when the precipitation is carried out improperly, the particles are reloaded into cationically stabilized latex particles. This significantly reduces the degree of felling.
  • the invention is explained in more detail in the following examples.
  • wastewater from mechanically coagulated polymer dispersions which contained approximately 90% by weight of the perfluorooctanoic acid used in the polymerization and latex particles. They are not diluted with washing water from the agglomerated resins.
  • the dimensions of the anion exchange column were: height 5 cm, diameter 4 cm, filling quantity 500 ml, flow rate 0.5 to 1 l / h, procedure: from top to bottom.
  • a commercially available, strongly basic ion exchanger ® AMPERLITE IRA 402 was used, capacity: 1.2 mmol / ml.
  • Polymerization liquor from the polymerization of the terpolymer from tetrafluoroethylene, hexafluoropropene and vinylidene fluoride with 0.3% by weight polymer-latex particles and 0.1% by weight perfluorooctanoic acid.
  • a commercial p-octylphenol oxyethylate ® TRITON X 100 was used
  • Example 1 is repeated with the modification that a commercially available fatty alcohol polyglycol ether ® GENAPOL X 080 (Hoechst AG) was used as the nonionic surface-active agent.
  • Example 2 was repeated, but using a process wastewater ("polymerization liquor") from the polymerization of a copolymer of tetrafluoroethylene with perfluoro (n-propyl-vinyl) ether containing 0.1% by weight of perfluorooctanoic acid and 0.4% by weight. % Polymer latex particles was used.
  • Example 2 was repeated, but using a process wastewater ("polymerization liquor”) from the polymerization of a copolymer of tetrafluoroethylene with ethylene with 0.2% by weight of perfluorooctanoic acid and 0.6% by weight of polymer latex particles.
  • polymerization liquor a process wastewater from the polymerization of a copolymer of tetrafluoroethylene with ethylene with 0.2% by weight of perfluorooctanoic acid and 0.6% by weight of polymer latex particles.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Removal Of Specific Substances (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Treatment Of Water By Ion Exchange (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)

Abstract

The invention relates to a method for recovering fluorinated emulsifiers from an aqueous phase containing small quantities of fluoro-polymer particles. According to the inventive method, the aqueous phase is treated with a small quantity of a non-ionic surface-active agent, the treated aqueous phase is brought into contact with an anionic exchanger resin, and the adsorbed emulsifier is separated from the exchanger resin. The fine particle fluoro polymer can be quantitatively precipitated in the untreated aqueous phase or the eluate.

Description

Verfahren zur Rückgewinnung fluorierter Emulgatoren aus wäßrigen PhasenProcess for the recovery of fluorinated emulsifiers from aqueous phases
Die Erfindung betrifft die Aufarbeitung von Abwässern, insbesondere von schwach belasteten Abwässern, die fluorierte Emulgatoren enthalten, wie sie bei der Polymerisation fluorierter Monomerer eingesetzt werden, da sie keine telogenen Eigenschaften haben. Vor allem werden die Salze, vorzugsweise die Alkali- oder Ammoniumsalze, von perfluorierten oder teilfluorierten Alkancarbonsäuren oder -sulfonsäuren verwendet. Diese Verbindungen werden durch Elektrofluorierung oder durch die Telomerisation fluorierter Monomerer hergestellt, was mit hohem Aufwand verbunden ist. Es hat deshalb nicht an Versuchen gefehlt, diese Wertstoffe aus Abwässern wiederzugewinnen .The invention relates to the treatment of waste water, especially weakly contaminated waste water, which contain fluorinated emulsifiers, such as are used in the polymerization of fluorinated monomers, since they have no telogenic properties. Above all, the salts, preferably the alkali or ammonium salts, of perfluorinated or partially fluorinated alkane carboxylic acids or sulfonic acids are used. These compounds are produced by electrofluorination or by the telomerization of fluorinated monomers, which is very expensive. There has been no shortage of attempts to recover these valuable materials from waste water.
Aus der US-A-5 442 097 ist ein Verfahren zur Rückgewinnung von fluorierten Carbonsäuren in verwertbarer Form aus verunreinigten Ausgangsmaterialien bekannt, wobei man aus diesen Materialien im wäßrigen Medium mit einer hinreichend starken Säure die fluorierte Carbonsäure nötigenfalls freisetzt, diese mit einem geeigneten Alkohol umsetzt und den gebildeten Ester abdestilliert . Als Ausgangsmaterial kann hierbei eine Polymerisationsflotte dienen, insbesondere aus der sogenannten Emulsionspolymerisation, bei der das Fluorpolymer in Form kolloidaler Teilchen mit Hilfe relativ hoher Mengen an Emulgator hergestellt wird. "Polymerisationsflotte" ist hierbei das Abwasser, das bei der Isolierung des Fluorpolymers durch Koagulation (ohne weitere Verfahrensschritte wie Wäschen) anfällt. Dieses Verfahren hat sich sehr gut bewährt, setzt aber eine gewisse Konzentration an fluorierter Carbonsäure im Ausgangsmaterial voraus .A process for the recovery of fluorinated carboxylic acids in usable form from contaminated starting materials is known from US Pat. No. 5,442,097, where necessary the fluorinated carboxylic acid is released from these materials in an aqueous medium with a sufficiently strong acid, and these are reacted with a suitable alcohol and distilled off the ester formed. A polymerization liquor can be used as the starting material, in particular from so-called emulsion polymerization, in which the fluoropolymer is produced in the form of colloidal particles with the aid of relatively high amounts of emulsifier. "Polymerization liquor" is the wastewater that is obtained when the fluoropolymer is isolated by coagulation (without further process steps such as washing). This The process has proven itself very well, but requires a certain concentration of fluorinated carboxylic acid in the starting material.
Die destillative Rückgewinnung der fluoriertenDistillation recovery of the fluorinated
Carbonsäuren kann auch in Abwesenheit von Alkoholen durchgeführt werden. Bei dieser Verfahrensvariante wird die Fluorcarbonsäure in Form eines hochkonzentrierten Azeotrops abdestilliert. Diese Verfahrensvariante ist aber aus energetischen Gründen technisch nicht vorteilhaft. Außerdem ist das resultierende Abwasser stärker belastet als vor der Behandlung.Carboxylic acids can also be carried out in the absence of alcohols. In this process variant, the fluorocarboxylic acid is distilled off in the form of a highly concentrated azeotrope. However, this method variant is not technically advantageous for energy reasons. The resulting wastewater is also more polluted than before treatment.
Aus der DE-A-20 44 986 ist ein Verfahren zur Gewinnung von Perfluorcarbonsäuren aus verdünnter Lösung bekannt, wobei man die verdünnte Lösung der Perfluorcarbonsäuren in Adsorptionskontakt mit einem s'chwachbasisehen Anionen-Austauscherharz bringt und dadurch die in der Lösung enthaltene Perfluorcarbonsäure an das Anionen- Austauscherharz adsorbiert, das Anionen-Austauscherharz mit einer wäßrigen Ammoniaklösung eluiert und damit die adsobierte Perfluorcarbonsäure in das Elutionsmittel überführt und schließlich die Säure aus dem Eluat gewinnt. Für eine vollständige Elution werden jedoch relativ große Mengen an verdünnter Ammoniaklösung benötigt und außerdem ist dieses Verfahren sehr zeitraubend. Diese Nachteile überwindet das aus der US-A-4 282 162 bekannte Verfahren zur Elution von an Anionenaustauschern adsorbierten fluorierten Emulgatorsäuren, bei dem die Elution der adsorbierten fluorierten Emulgatorsäure aus dem Anionenaustauscher mit einem Gemisch aus verdünnter Mineralsäure und einem organischen Lösungsmittel vorgenommen wird. Bei diesem Verfahren wird durch den Einsatz der Säure gleichzeitig die Regeneration des Austauscherharzes bewirkt. Die Verwendung von Anionen-Austauscherharzen bei der Abwasserbehandlung im technischen Maßstab wird essentiell behindert durch die Anwesenheit von Fluorpolymer-Latex- Partikel. Die Latex-Partikel sind anionisch stabilisiert und werden folglich im Anionen-Austauscherharz koaguliert. Dadurch wird die Austauscherkolonne verstopft .DE-A-20 44 986 discloses a process for obtaining perfluorocarboxylic acids from dilute solution, the dilute solution of the perfluorocarboxylic acids being brought into adsorption contact with a weakly based anion exchange resin and thereby the perfluorocarboxylic acid contained in the solution to the anions - Exchange resin adsorbed, the anion exchange resin eluted with an aqueous ammonia solution and thus the adsorbed perfluorocarboxylic acid is converted into the eluent and finally the acid from the eluate is recovered. However, relatively large amounts of dilute ammonia solution are required for complete elution and, moreover, this process is very time consuming. These disadvantages are overcome by the process known from US Pat. No. 4,282,162 for the elution of fluorinated emulsifier acids adsorbed on anion exchangers, in which the adsorption of the adsorbed fluorinated emulsifier acid from the anion exchanger is carried out with a mixture of dilute mineral acid and an organic solvent. In this process, the regeneration of the exchange resin is effected by the use of the acid. The use of anion exchange resins in wastewater treatment on an industrial scale is essentially hindered by the presence of fluoropolymer latex particles. The latex particles are anionically stabilized and are consequently coagulated in the anion exchange resin. This clogs the exchanger column.
Diese Schwierigkeit überwindet ein vorgeschlagenes Verfahren zur Gewinnung von fluorierten Emulgatorsäuren, das dadurch gekennzeichnet ist, daß man die im Abwasser feinverteilten Feststoffe mit einem Tensid beziehungsweise einer oberflächenaktiven Substanz stabilisiert und anschließend die fluorierten Emulgatorsäuren an ein Anionentauscherharz bindet und aus diesem die fluorierten Emulgatorsäuren eluiert (WO-A-99/62830) . In den Beispielen werden nichtionische Tenside in einer Konzentration von 100 bis 400 mg/1 eingesetzt .This problem is overcome by a proposed process for the production of fluorinated emulsifier acids, which is characterized in that the solids finely divided in the waste water are stabilized with a surfactant or a surface-active substance and then the fluorinated emulsifier acids are bound to an anion exchange resin and the fluorinated emulsifier acids are eluted from this (WO -A-99/62830). In the examples, nonionic surfactants are used in a concentration of 100 to 400 mg / 1.
Es wurde nun ein Verfahren zur Rückgewinnung fluorierter Emulgatoren aus einer wäßrigen Phase gefunden, wobei diese wäßrige Phase neben dem Emulgator kleine Mengen von Fluorpolymerteilchen sowie gegebenenfalls weitere Substanzen enthält, wobei man einen oberen Konzentrationswert eines nichtionischen oberflächenaktiven Stoffes bestimmt, unterhalb dem keine weitere Abnahme in der Desorption des an einen Anionenaustauscher gebundenen Emulgators auftritt, - die wäßrige Phase auf eine Konzentration an nichtionischem oberflächenaktivem Mittel zwischen dem so bestimmten oberen Konzentrationswert oder einer niedrigeren, noch zur Vermeidung einer Koagulation der Polymerteilchen wirksamen Konzentration einstellt, die so eingestellte wäßrige Phase in Kontakt mit einem anionischen Austauscherharz bringt, um die Adsorption des Emulgators an das Austauscherharz zu bewirken und den Emulgator aus dem Austauscherharz freisetzt.A process has now been found for recovering fluorinated emulsifiers from an aqueous phase, this aqueous phase containing small amounts of fluoropolymer particles and optionally further substances in addition to the emulsifier, an upper concentration value of a nonionic surface-active substance being determined, below which no further decrease in the Desorption of the emulsifier bound to an anion exchanger occurs, - the aqueous phase is adjusted to a concentration of nonionic surfactant between the upper concentration value determined in this way or a lower concentration which is still effective to avoid coagulation of the polymer particles, brings the aqueous phase thus adjusted into contact with an anionic exchange resin in order to effect adsorption of the emulsifier on the exchange resin and to release the emulsifier from the exchange resin.
Die geeignete Konzentration an nichtionischem oberflächenaktivem Mittel ist abhängig von der Art des Polymers, vom oberflächenaktiven Mittel und gegebenenfalls von weiteren in der wäßrigen Phase enthaltenen Stoffen. Es ist deshalb ratsam, für jedes zu behandelnde Abwasser die geeigneten Konzentrationsgrenzen an dem nichtionischen oberflächenaktiven Mittel zu bestimmen. Üblicherweise genügt eine Konzentration von höchstens 10 ppm, meistens eine Konzentration im Bereich von 5 bis 0,1 ppm.The suitable concentration of nonionic surface-active agent depends on the type of polymer, on the surface-active agent and optionally on other substances contained in the aqueous phase. It is therefore advisable to determine the appropriate concentration limits on the nonionic surfactant for each wastewater to be treated. Usually a concentration of at most 10 ppm is sufficient, mostly a concentration in the range of 5 to 0.1 ppm.
Da es sich - wie vorstehend genahnt - bevorzugt um schwach belastete Abwässer handelt, die erfindungsgemäß bearbeitet werden können, werden sinnvollerweise nur so wenig Hilfschemikalien wie nötig dem Abwasser zugesetzt, um nicht eine neue Belastung für die weitere Aufarbeitung des Abwassers herbeizuführen. Will man andererseits in der industriellen Praxis, bei der gegebenenfalls Gemische verschiedener Abwässer vereinigt aufgearbeitet werden, die jeweilige Bestimmung der Grenzwerte vermeiden, so kann man in der Regel mit einem Mittelwert von etwa 3 ppm problemlos arbeiten.Since - as mentioned above - it is preferably slightly polluted wastewater that can be processed according to the invention, only as little auxiliary chemicals as necessary are expediently added to the wastewater in order not to bring about a new burden for the further processing of the wastewater. On the other hand, if one wants to avoid the respective determination of the limit values in industrial practice, in which mixtures of different wastewater are possibly processed together, one can generally work without problems with an average value of about 3 ppm.
Ein weiterer Vorteil des Einsatzes geringer Mengen an nichtionischem oberflächenaktivem Mittel ist neben der Vermeidung unnötiger Kosten auch die Unterdrückung des Schäumens, das im industriellen Maßstab sehr lästig sein kann und gegebenenfalls eine weitere Belastung des Abwassers mit Schaumdämpfern erfordert . Bei der Herstellung von Fluorpolymeren wie Polytetrafluorethylen, Fluorthermoplasten und Fluorelastomeren werden die Polymeren durch Koagulation abgetrennt, wobei diese mechanisch mit hohen Scherverhältnissen oder chemisch durch Fällen mitAnother advantage of using small amounts of nonionic surface-active agent, in addition to avoiding unnecessary costs, is also the suppression of foaming, which can be very troublesome on an industrial scale and may require further pollution of the waste water with foam dampers. In the production of fluoropolymers such as polytetrafluoroethylene, fluorothermoplastics and fluoroelastomers, the polymers are separated by coagulation, these being mechanically subject to high shear ratios or chemically by means of coagulation
Mineralsäuren oder anorganischen Salzen erfolgt. Die koagulierten Fluorpolymeren werden üblicherweise agglomeriert und mit Wasser gewaschen. So ergeben sich relativ hohe Mengen an Prozeßabwässern, nämlich üblicherweise etwa 5 bis 10 t Abwässer pro 1 tMineral acids or inorganic salts. The coagulated fluoropolymers are usually agglomerated and washed with water. This results in relatively high amounts of process waste water, namely usually about 5 to 10 t of waste water per 1 t
Fluorpolymer. Bei diesen Prozeßschritten wird der fluorierte Emulgator zum größten Teil ausgewaschen und findet sich so im Abwasser. Die Konzentration beträgt üblicherweise wenige Millimol pro Liter entsprechend zu etwa 1000 ppm. Neben den bereits genannten Bestandteilen enthält das Abwasser weiterhin Chemikalien aus der Polymerisation wie Initiatoren und Puffer, die etwa in der gleichen Größenordnung wie der Emulgator vorliegen und sehr geringe Mengen an Fluorpolymer-Latex-Teilchen, die nicht koaguliert wurden. Der Anteil dieser Latex- Partikel im Abwasser ist üblicherweise unter 0,5 Gew.-%.Fluoropolymer. During these process steps, the fluorinated emulsifier is largely washed out and is thus found in the waste water. The concentration is usually a few millimoles per liter, corresponding to about 1000 ppm. In addition to the components already mentioned, the wastewater also contains chemicals from the polymerization, such as initiators and buffers, which are approximately of the same order of magnitude as the emulsifier, and very small amounts of fluoropolymer latex particles which have not been coagulated. The proportion of these latex particles in the wastewater is usually less than 0.5% by weight.
Es wurde bereits erwähnt, daß die Herstellung der fluorierten Emulgatoren mit hohem Aufwand verbunden ist, zumal diese Stoffe in hoher Reinheit eingesetzt werden müssen. Weiterhin sind diese Emulgatoren biologisch schwer abbaubar, weshalb eine möglichst vollständige Abtrennung aus dem Abwasser geboten erscheint . Das erfindungsgemäße Verfahren erlaubt eine praktisch quantitative Rückgewinnung auch aus den vorstehend definierten, schwach belasteten Abwässern.It has already been mentioned that the production of the fluorinated emulsifiers is very time-consuming, especially since these substances have to be used in high purity. Furthermore, these emulsifiers are difficult to biodegrade, which is why it appears necessary to separate them as completely as possible from the waste water. The method according to the invention allows a practically quantitative recovery even from the slightly polluted waste water defined above.
Ein weiterer Vorteil der geringen Konzentrationen an nichtionischem oberflächenaktivem Mittel ist die wirksamere Abtrennung der Latex-Partikel aus dem anionenausgetauschten Abwasser. Vorteilhaft werden diese Partikel mit geringen Mengen organischer Flockungsmittel koaguliert, wobei es sich gezeigt hat, daß die Menge an erforderlichem Flockungsmittel mit steigender Konzentration an nichtionischem oberflächenaktivem Mittel steigt. Die so erhaltenen, nun mit geringen Mengen an oberflächenaktivem Mittel und Flockungsmittel belasteten Fluorpolymere können in Baustoffen verwendet werden und müssen deshalb nicht aufwendig aufgearbeitet oder deponiert werden.Another advantage of the low concentrations of nonionic surfactant is the more effective separation of the latex particles from the anion-exchanged wastewater. These particles are advantageously coagulated with small amounts of organic flocculant, it being found that the amount of flocculant required increases with increasing concentration of nonionic surface-active agent. The fluoropolymers obtained in this way, now loaded with small amounts of surface-active agent and flocculant, can be used in building materials and therefore do not have to be worked up or deposited in a complex manner.
Als nichtionische oberflächenaktive Mittel eignen sich die handelsüblichen Oxethylate und Oxpropylate von organischen Hydroxyverbindungen, wobei aus Gründen des Umweltschutzes nichtaromatische Oxalkylate bevorzugt werden. Bevorzugt werden deshalb Oxethylate von langkettigen Alkoholen eingesetzt.The commercially available oxethylates and oxpropylates of organic hydroxy compounds are suitable as nonionic surface-active agents, non-aromatic oxalkylates being preferred for reasons of environmental protection. Oxethylates of long-chain alcohols are therefore preferably used.
Organische Flockungsmittel sind zum Beispiel beschrieben in Encycl . Polym. Sei. Engng., Wiley Interscience, New York 7, 211 (1987) .Organic flocculants are described, for example, in Encycl. Polym. Be. Engng., Wiley Interscience, New York 7, 211 (1987).
Bei den organischen Flockungsmitteln handelt es sich vorteilhaft um kationische Produkte, beispielsweise Polydiallyldimethylammoniumchlorid .The organic flocculants are advantageously cationic products, for example polydiallyldimethylammonium chloride.
Kationische Tenside, wie zum Beispiel Didecyldimethylammoniumchlorid, können ebenfalls zur Ausfällung der nichtionischen stabilisierten Latex-Partikel benutzt werden. Ihre Verwendung im technischen Maßstab ist aber problematisch, weil bei unsachgemäßer Durchführung der Fällung eine Umladung der Partikel zu kationisch stabilisierten Latex-Partikel überlagert ist. Dadurch wird der Fällgrad erheblich vermindert . Die Erfindung wird in den folgenden Beispielen näher erläutert .Cationic surfactants such as didecyldimethylammonium chloride can also be used to precipitate the nonionic stabilized latex particles. However, their use on an industrial scale is problematic because, when the precipitation is carried out improperly, the particles are reloaded into cationically stabilized latex particles. This significantly reduces the degree of felling. The invention is explained in more detail in the following examples.
BeispieleExamples
In den folgenden Beispielen wurden Abwässer mechanisch koagulierter Polymerdispersionen eingesetzt, die circa 90 Gew.-% der bei der Polymerisation eingesetzten Perfluoroctansäure sowie Latex-Partikel enthielten. Sie sind nicht mit Waschwässern der agglomerierten Harze verdünnt . Untersucht wurden Abwässer aus der Polymerisation von Tetrafluorethylen mit Ethylen, Perfluor (n-propyl-vinyl) ether, Hexafluorpropen und eines Terpolymers aus Tetrafluorethylen, Hexafluorpropen undIn the following examples, wastewater from mechanically coagulated polymer dispersions was used which contained approximately 90% by weight of the perfluorooctanoic acid used in the polymerization and latex particles. They are not diluted with washing water from the agglomerated resins. Wastewater from the polymerization of tetrafluoroethylene with ethylene, perfluoro (n-propyl vinyl) ether, hexafluoropropene and a terpolymer from tetrafluoroethylene, hexafluoropropene and
Vinylidenfluorid sowie Mischungen solcher Abwässer. Da es sich zeigte, daß Abwässer der genannten Terpolymer sowie der Copolymere aus Tetrafluorethylen und des genannten Ethers sowie des Ethylens eher zu Verstopfungen der Austauschersäule führten, wurden diese Abwässer näher untersucht .Vinylidene fluoride and mixtures of such waste water. Since it was found that wastewater from the terpolymer mentioned and the copolymers of tetrafluoroethylene and the ether and from the ethylene tended to clog the exchanger column, these wastewater were examined in more detail.
Die Dimensionen der Anionenaustauschersäule waren: Höhe 5 cm, Durchmesser 4 cm, Füllmenge 500 ml, Durchflußgeschwindigkeit 0,5 bis 1 1/h, Arbeitsweise: von oben nach unten. Eingesetzt wurde ein handelsüblicher, starkbasischer Ionenaustauscher ®AMPERLITE IRA 402, Kapazität: 1,2 mmol/ml.The dimensions of the anion exchange column were: height 5 cm, diameter 4 cm, filling quantity 500 ml, flow rate 0.5 to 1 l / h, procedure: from top to bottom. A commercially available, strongly basic ion exchanger ® AMPERLITE IRA 402 was used, capacity: 1.2 mmol / ml.
Ein Zusetzen der Säule wurde festgestellt, in dem dieClogging of the column was found in which the
Durchflußgeschwindigkeit unter konstantem hydrostatischem Druck kontrolliert wurde. Die Versuche wurden bis zum Durchbruch der Perfluoroctansäure durchgeführt . Ein typischer Versuch im Labormaßstab erforderte eine Menge bis zu 150 1. Die Durchflußgeschwindigkeit wurde am Beginn und am Ende durch Wägen des ausgetauschten Abwassers für eine gegebene Zeit bestimmt. Eine Abnahme der Durchflußgeschwindigkeit von unter 20 % am Ende des Versuchs wurde als annehmbar erachtet . Zu Beginn des Versuchs war das Anionen-Austauscherharz in der OH"-Form. Die Bestimmungsgrenze für die Perfluoroctansäure war 5 ppm.Flow rate was controlled under constant hydrostatic pressure. The experiments were carried out until the breakthrough of perfluorooctanoic acid. A typical experiment on a laboratory scale required a quantity of up to 150 l Beginning and end determined by weighing the exchanged wastewater for a given time. A decrease in flow rate of less than 20% at the end of the experiment was considered acceptable. At the beginning of the experiment, the anion exchange resin was in the OH " form. The limit of quantification for the perfluorooctanoic acid was 5 ppm.
Beispiel 1example 1
Eingesetzt wurde ein ProzeßabwasserProcess wastewater was used
("Polymerisationsflotte") aus der Polymerisation des Terpolymers aus Tetrafluorethylen, Hexafluorpropen und Vinylidenfluorid mit 0,3 Gew.-% Polymer-Latex-Teilchen und 0,1 Gew.-% Perfluoroctansäure . Eingesetzt wurde ein handelsübliches p-Octylphenol-oxethylat ®TRITON X 100("Polymerization liquor") from the polymerization of the terpolymer from tetrafluoroethylene, hexafluoropropene and vinylidene fluoride with 0.3% by weight polymer-latex particles and 0.1% by weight perfluorooctanoic acid. A commercial p-octylphenol oxyethylate ® TRITON X 100 was used
(Rohm & Haas, CAS-Nr. 9002-93-1) .(Rohm & Haas, CAS No. 9002-93-1).
Tabelle 1Table 1
Die Perfluoroctansäure-Konzentrationen nahe dem Durchbruch zeigen ein "Auslaufen" bei höheren Konzentrationen des nichtionischen oberflächenaktiven Mittels. Die nominelle Ionenaustauscherkapazität scheint bei höheren Konzentrationen an nichtionischem oberflächenaktivem Mittel herabgesetzt. The perfluorooctanoic acid concentrations near the breakthrough show "leakage" at higher concentrations of the nonionic surfactant. The nominal ion exchange capacity appears to be reduced at higher concentrations of nonionic surfactant.
Beispiel 2Example 2
Beispiel 1 wird wiederholt mit der Abwandlung, daß als nichtionisches oberflächenaktives Mittel ein handelsüblicher Fettalkoholpolyglykolether ®GENAPOL X 080 (Hoechst AG) eingesetzt wurde.Example 1 is repeated with the modification that a commercially available fatty alcohol polyglycol ether ® GENAPOL X 080 (Hoechst AG) was used as the nonionic surface-active agent.
Tabelle 2Table 2
Beispiel 3 Example 3
Beispiel 2 wurde wiederholt, wobei jedoch ein Prozeßabwasser ("Polymerisationsflotte") aus der Polymerisation eines Copolymeren von Tetrafluorethylen mit Perfluor (n-propyl-vinyl) ether mit einem Gehalt an 0,1 Gew.-% Perfluoroctansäure und 0,4 Gew.-% Polymer-Latex-Partikeln eingesetzt wurde.Example 2 was repeated, but using a process wastewater ("polymerization liquor") from the polymerization of a copolymer of tetrafluoroethylene with perfluoro (n-propyl-vinyl) ether containing 0.1% by weight of perfluorooctanoic acid and 0.4% by weight. % Polymer latex particles was used.
Tabelle 3Table 3
Beispiel 4Example 4
Beispiel 2 wurde wiederholt, wobei jedoch ein Prozeßabwasser ("Polymerisationsflotte") aus der Polymerisation eines Copolymeren von Tetrafluorethylen mit Ethylen mit 0,2 Gew.-% Perfluoroctansäure und 0,6 Gew.-% Polymer-Latex-Teilchen eingesetzt wurde. Tabelle 4Example 2 was repeated, but using a process wastewater ("polymerization liquor") from the polymerization of a copolymer of tetrafluoroethylene with ethylene with 0.2% by weight of perfluorooctanoic acid and 0.6% by weight of polymer latex particles. Table 4
Beispiel 5Example 5
Die in den Tabellen 5 und 6 angegebenen Abwässer wurden mit dem handelsüblichen organischen Flockungsmittel ®MAGNOFLOC 1697 (Polydiallyldimethylammoniumchlorid, Allied Colloids Company) behandelt. Die minimale Konzentration des Flockungsmittels für eine quantitative Fällung der Latex-Partikel wurde durch Titration bestimmt. Eine 0,lgew.%ige Lösung des Flockungsmittels wurde tropfenweise zu dem Austauscher-Eluat unter mildem Rühren gegeben. Die Latex-Partikel werden praktisch momentan gefällt und setzen sich sehr schnell ab. Das Eintropfen wird beendet, wenn kein weiterer Niederschlag mehr beobachtet wird. Die Ergebnisse zeigt die folgende Tabelle. Tabelle 5: PFOS-freies Prozeßabwasser (PFOS-Konzentration < 5 ppm)The waste water given in Tables 5 and 6 was treated with the commercially available organic flocculant ® MAGNOFLOC 1697 (polydiallyldimethylammonium chloride, Allied Colloids Company). The minimum concentration of the flocculant for a quantitative precipitation of the latex particles was determined by titration. A 0.1% by weight solution of the flocculant was added dropwise to the exchanger eluate with gentle stirring. The latex particles are practically felled at the moment and settle very quickly. The dropping is stopped when no further precipitation is observed. The results are shown in the following table. Table 5: PFOS-free process waste water (PFOS concentration <5 ppm)
Tabelle 6 : Unbehandeltes Prozeßabwasser (PFOS-Konzentration circa 1000 ppm)Table 6: Untreated process waste water (PFOS concentration approx. 1000 ppm)

Claims

Ansprüche Expectations
1. Verfahren zur Rückgewinnung fluorierter Emulgatoren aus einer wäßrigen Phase, die neben dem Emulgator kleine Mengen von Fluorpolymerteilchen enthält, dadurch gekennzeichnet, daß man1. A process for the recovery of fluorinated emulsifiers from an aqueous phase which, in addition to the emulsifier, contains small amounts of fluoropolymer particles, characterized in that
- einen oberen Konzentrationswert eines nichtionischen oberflächenaktiven Stoffes bestimmt, unterhalb dem keine weitere Abnahme in der Desorption des an einen Anionenaustauscher gebundenen Emulgators auftritt,determines an upper concentration value of a nonionic surfactant below which there is no further decrease in the desorption of the emulsifier bound to an anion exchanger,
- die wäßrige Phase auf eine Konzentration an nichtionischem oberflächenaktivem Mittel zwischen dem so bestimmten oberen Konzentrationswert oder einer niedrigeren, noch zur Vermeidung einer- The aqueous phase to a concentration of nonionic surfactant between the upper concentration value determined in this way or a lower, still to avoid a
Koagulation der Polymerteilchen wirksamen Konzentration einstellt,Sets coagulation of the polymer particles effective concentration,
- die so eingestellte wäßrige Phase in Kontakt mit einem anionischen Austauscherharz bringt, um die Adsorption des Emulgators an das Austauscherharz zu bewirken und- The aqueous phase thus set in contact with an anionic exchange resin to effect the adsorption of the emulsifier on the exchange resin and
- den Emulgator aus dem Austauscherharz freisetzt.- releases the emulsifier from the exchange resin.
2. Verfahren zur Rückgewinnung fluorierter Emulgatoren aus einer wäßrigen Phase, die neben dem Emulgator kleine Mengen von Fluorpolymerteilchen enthält, dadurch gekennzeichnet, daß man die wäßrige Phase auf eine Konzentration an nichtionischem oberflächenaktivem Mittel zwischen 10 ppm und einer niedrigeren noch zur Vermeidung einer Koagulation der2. Process for the recovery of fluorinated emulsifiers from an aqueous phase which, in addition to the emulsifier, contains small amounts of fluoropolymer particles, characterized in that the aqueous phase is concentrated to a concentration of nonionic surface-active agent between 10 ppm and a lower level to avoid coagulation of the
Polymerteilchen wirksamen Konzentration einstellt, die so eingestellte wäßrige Phase in Kontakt mit einem anionischen Austauscherharz bringt, um die Adsorption des Emulgators an das Austauscherharz zu bewirken und den Emulgator aus dem Austauscherharz freisetzt . Setting effective polymer particles concentration, the aqueous phase thus brought into contact with an anionic exchange resin to cause the adsorption of the emulsifier on the exchange resin and to release the emulsifier from the exchange resin.
3. Verfahren nach Anspruch 2, wobei die Konzentration des nichtionischen oberflächenaktiven Mittels von 5 bis 0,1 ppm beträgt.3. The method of claim 2, wherein the concentration of the nonionic surfactant is from 5 to 0.1 ppm.
4. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das nichtionische oberflächenaktive Mittel nicht aromatisch ist.4. The method according to one or more of the preceding claims, characterized in that the nonionic surfactant is not aromatic.
5. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, wobei das nichtionische oberflächenaktive Mittel ein Fettalkoholoxethylat ist.5. The method according to one or more of the preceding claims, wherein the nonionic surfactant is a fatty alcohol oxyethylate.
6. Verfahren nach einem oder mehreren der vorhergehenden Ansprüche, wobei zu der wäßrigen Phase eine wirksame6. The method according to one or more of the preceding claims, wherein an effective to the aqueous phase
Menge eines organischen Flockungsmittels zugegeben wird, um im wesentlichen die gesamten Fluorpolymer- Partikel auszufällen.Amount of organic flocculant is added to precipitate substantially all of the fluoropolymer particles.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß das Flockungsmittel ein organisches kationisches Flockungsmittel ist.7. The method according to claim 6, characterized in that the flocculant is an organic cationic flocculant.
8. Verfahren nach Anspruch 6 oder 7 , dadurch gekennzeichnet, daß das Flockungsmittel der unbehandelten oder behandelten wäßrigen Phase zugesetzt wird. 8. The method according to claim 6 or 7, characterized in that the flocculant is added to the untreated or treated aqueous phase.
EP00954467A 1999-07-17 2000-07-11 Method for recovering fluorinated emulsifiers from aqueous phases Ceased EP1208065A1 (en)

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