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EP1831155A1 - Procede pour reduire les composants chlores dans les isocyanates organiques - Google Patents

Procede pour reduire les composants chlores dans les isocyanates organiques

Info

Publication number
EP1831155A1
EP1831155A1 EP05815233A EP05815233A EP1831155A1 EP 1831155 A1 EP1831155 A1 EP 1831155A1 EP 05815233 A EP05815233 A EP 05815233A EP 05815233 A EP05815233 A EP 05815233A EP 1831155 A1 EP1831155 A1 EP 1831155A1
Authority
EP
European Patent Office
Prior art keywords
organic isocyanates
isocyanates
mixtures
organic
isocyanate
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.)
Withdrawn
Application number
EP05815233A
Other languages
German (de)
English (en)
Inventor
Andreas Job
Klaus Jost
Hans-Ulrich Dummersdorf
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.)
Lanxess Deutschland GmbH
Original Assignee
Lanxess Deutschland 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
Priority claimed from DE200410063222 external-priority patent/DE102004063222A1/de
Priority claimed from DE200410063221 external-priority patent/DE102004063221A1/de
Application filed by Lanxess Deutschland GmbH filed Critical Lanxess Deutschland GmbH
Publication of EP1831155A1 publication Critical patent/EP1831155A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C263/00—Preparation of derivatives of isocyanic acid
    • C07C263/18—Separation; Purification; Stabilisation; Use of additives
    • C07C263/20—Separation; Purification

Definitions

  • the present invention relates to a process for the substantial liberation of organic isocyanates or isocyanate mixtures of chlorine compounds by contacting the isocyanates or isocyanate mixtures with a water-containing
  • Inert gas stream or organic materials that have cation-exchanging effect The method allows a gentle liberation of the isocyanates of chlorine-containing compounds and is particularly suitable for temperature-sensitive isocyanates.
  • Organic isocyanates such as 2,4- and 2,6-diisocyanatotoluene, but also aliphatic isocyanates such as n-butyl isocyanate often contain impurities as a result of production, in particular such compounds which are hydrolyzable
  • Impurities often strong reactivity fluctuations, which are unfavorable for a reproducible large-scale use and a reduced storage stability.
  • the greatest possible liberation of the organic isocyanates from the impurities mentioned is therefore of considerable technical as well as economic importance.
  • a disadvantage of the described method is that they can be applied only to thermally insensitive isocyanates and thermally also insensitive impurities survive these processes without prejudice.
  • Metal complexes an undesirable formation of dimers, trimers and carbodiimides.
  • epoxy compounds see for example EP 374 932 A and US 6,245,935
  • formic or acetic acid or its derivatives see for example US 3,799,963
  • trimethylsilyl compounds see for example EP 524,507 A
  • a process for lowering the content of hydrolyzable chlorine in organic isocyanates or mixtures of organic isocyanates which is characterized in that liquid organic isocyanates or liquid mixtures of organic isocyanates or solutions of organic isocyanates or solutions of mixtures of organic isocyanates in a first step be brought into contact with a hydrous inert gas stream or with organic material with cation-exchanging effect and the resulting reaction mixture is freed in a second step of any solids present.
  • hydrolyzable chlorine used below is used for compounds which react with water to form hydrogen chloride or chloride ions.
  • chloroformic acid amides are the chloroformic acid amides as they occur for example in the preparation of isocyanates by phosgenation of amines as intermediates.
  • Any organic isocyanates or mixtures of isocyanates can be used for the process according to the invention, wherein the term isocyanate is intended to include compounds which contain one, two or even more isocyanate groups.
  • Preferred organic isocyanates are, for example, monoisocyanates having aliphatically, cycloaliphatically, araliphatically or aromatically bound isocyanate groups such as.
  • Preferred organic isocyanates are, for example, monoisocyanates having aliphatically, cycloaliphatically, araliphatically or aromatically bound isocyanate groups such as.
  • Diisocyanatodiphenylmethane 1,5-diisocyanato naphthalene, dipropylene glycol diisocyanate, 2,4- or 2,6-diisocyanato-1-methylcyclohexane;
  • Triisocyanates and / or higher functional isocyanates such.
  • liquid organic isocyanates or liquid mixtures of organic isocyanates or solutions of organic isocyanates or solutions of mixtures of organic isocyanates with organic material with cation-exchanging action are brought into contact, the following applies:
  • liquid organic isocyanates or liquid mixtures become more organic
  • Isocyanates more preferably used liquid organic isocyanates.
  • the state of matter liquid refers to the state at the selected reaction temperature.
  • the cation-exchanging organic material may, for example, be any polymeric, organic material containing acidic groups relative to a comparative aqueous scale.
  • the organic material used should be substantially free of water and other isocyanate-reactive solvents and admixtures and by common separation methods such. As filtration, sedimentation or centrifugation can be separated from the isocyanates and be largely free of heavy metal ions.
  • gel or macroporous, cation exchange organic materials are used.
  • Such materials are known, for example, from DE-A 1113570.
  • Suitable materials its called: Lewatite® SC 102, SC 104, SC 108, SPC 1 18 (all Fa. Bayer AG) or cation-exchanging Amberlite® or Duolite® (both Fa. Rohm and Haas).
  • Preferred materials in the context of the process according to the invention are the above-described cation-exchanging organic materials whose matrix Polymerization (copolymers of styrene and divinylbenzene and from (meth) acrylates and divinylbenzene) were obtained.
  • cation-exchanging organic materials whose matrix has been obtained by polymerization (copolymers of styrene and divinylbenzene) and the acidic groups, e.g. Sulfonic acid groups.
  • Substantially free of water in the context of the process according to the invention means that the proportion by Karl Fischer titration is ⁇ 5, preferably ⁇ 3 and particularly preferably ⁇ 1% by weight.
  • This optionally necessary drying can be done in a conventional manner, for example by exchanging the water for an inert, non-isocyanate-reactive solvent or by drying the materials preferably in
  • a content of such compounds of less than 5, preferably less than 3 and particularly preferably less than 1% by weight, should be understood to mean largely free of isocyanate-reactive solvents and admixtures.
  • a content of such ions which is largely free of heavy metal is to be understood as meaning a content of less than 0.5, preferably less than 0.3 and particularly preferably less than 0.1% by weight.
  • the cation exchange materials used in the process of this invention may be used either as solids without a solvent or as a slurry in an inert, non-isocyanate reactive solvent.
  • the cation exchange materials used in the process according to the invention can be regenerated by suitable process steps and reused in the process according to the invention.
  • the cation exchange-type materials are added in an amount of more than 0.1%, more preferably in an amount of 0.5 to 50%, and particularly preferably in an amount of 1.0 to 10% by weight cleaning isocyanate used.
  • the reaction temperature is for example -10 to 200 0 C, preferably 2O 0 C and 14O 0 C, particularly preferably 40 to 100 0 C, and still more preferably 50 to 80 0 C.
  • the contacting of the isocyanate compounds with the described cation-exchanging materials can be carried out such that the cation-exchanging organic material is a stationary phase of a
  • the method can also be operated in a continuous mode in such a device or similar apparatus.
  • liquid organic isocyanates or liquid mixtures of organic isocyanates or solutions of organic isocyanates or solutions of mixtures of organic isocyanates are brought into contact with a hydrous inert gas stream, the following applies:
  • inert gas all gases which do not react under normal reaction conditions with water, hydrogen chloride, amines or isocyanates, such as, for example, nitrogen, noble gases, e.g. Argon, carbon dioxide or mixtures of such gases.
  • organic solvents which do not react with water, hydrogen chloride, amines or isocyanates under customary reaction conditions can be used as solvent.
  • the state of matter liquid refers to the state at the selected reaction temperature.
  • the reaction temperature is for example -10 to 200 0 C, preferably 0 ° C to 12O 0 C, particularly preferably 10 to 8O 0 C.
  • the contacting of the liquid organic isocyanates or liquid mixtures of organic isocyanates or solutions of organic isocyanates or solutions of mixtures of organic isocyanates with a hydrous inert gas stream can be carried out, for example, by passing or introducing the aqueous inert gas stream.
  • Hydrous means that the inert gas has a certain partial pressure of water vapor and / or a mist is used, preferably, the water-containing inert gas has a certain partial pressure of water vapor.
  • the amount of water which is brought into contact with the isocyanates via the inert gas stream can be adjusted in the usual manner advantageously via the water saturation curve of the inert gas at various temperatures and is for example 0.5 to 2 mol, preferably 0.8 to 1.4 mol and particularly preferably 0.9 to 1.2 mol, based on 1 mol content of hydrolyzable chlorine in the isocyanate.
  • step 1 Before, during or after step 1, other cleaning methods can be carried out, for example, to remove coloring components and by-products.
  • These include, inter alia, treatments and / or lightening, for example with reducing or oxidizing agents and the treatment with adsorbents such as activated carbon and / or bleaching earths and / or silicic acids.
  • Brightening can exert a further positive effect on lowering the hydrolyzable chlorine content of the isocyanate compound.
  • the isocyanate present after the reduction of the chlorine content by the process according to the invention can be subjected to further purification by distillation. The distillation is preferably carried out under a pressure of z. B.
  • 0.001 mbar to 500 mbar e.g. as a bubble distillation or distillation by means of a thin-film evaporator.
  • the contacting is preferably carried out until the purified isocyanates or isocyanate mixtures have a hydrolyzable chlorine content of less than 180 ppm.
  • step two of the method according to the invention the following applies to both variants of the first step
  • reaction mixture resulting from step 1 is freed from existing solids, in particular the optionally organic material with cation-exchanging action.
  • the separation of solids can be carried out in a manner known per se, for example by sedimentation, centrifugation or filtration, with filtration, in particular pressure filtration, being preferred.
  • Reactor-filtration unit combination if necessary to carry out in a continuous procedure.
  • the purified isocyanates or isocyanate mixtures obtainable according to the invention usually have a content of hydrolyzable chlorine of less than 400 ppm and a very high purity. You can therefore z. B. for the preparation of particularly pure oligomeric polyisocyanates or prepolymers or as intermediates for polyurethane moldings and coating agents.
  • the advantage of the process according to the invention lies in the fact that it is technically easy in the organic isocyanates or isocyanate mixtures to be purified controllable and mild conditions interfering chlorine compounds can be separated very selectively and without appreciable formation of by-products.
  • the method is also suitable for the demanding workup of aliphatic isocyanates.
  • n-butyl isocyanate (HC value: 2056 ppm, purity according to GC analysis: 98.7%) submitted.
  • a glass sintered frit (Pore 3)
  • a stream of nitrogen at 10 1 per hour passed through the presented and heated to 6O 0 C isocyanate, the nitrogen stream is previously passed at 23 ° C for humidification through a water-filled wash bottle.
  • a solid begins to precipitate.
  • a sample for the HC value determination is taken from the supernatant solution (the analysis shows an HC value of 511 ppm).
  • n-butyl isocyanate (HC value: 1300 ppm, purity according to GC analysis: 99.5%) submitted.
  • HC value 1300 ppm, purity according to GC analysis: 99.5%
  • a glass sintered frit (Pore 2) is a nitrogen flow at about 9-10 1 per hour by the presented and heated to 60 0 C.
  • the nitrogen stream is previously passed at 23 ° C for humidification through a water-filled wash bottle. After a total of 15.5 hours, the nitrogen inlet is switched off (water consumption in the wash bottle: 3.5 g), the mixture is cooled to RT and filtered. This gives a clear liquid with a HC value of 100 ppm, a purity of 99.5% by GC analysis and a yield of 96% d.Th ..
  • Example 3 (according to the invention), Examples 4 to 6 (for comparison)
  • n-butyl isocyanate In a gas-tight bottle 80 g of n-butyl isocyanate are presented. 5.1 g of Lewatit® SC 102 (cation exchanger) are then added to the vessel. This mixture is heated at 6O 0 C. From the supernatant solution is after 5 hours a sample for HC value determination of the proportion of hydrolyzable chlorine (HC value) pulled. After a total of 15 hours, the Lewatit® is filtered off and then the clear liquid is analyzed by gas chromatography. The results are documented in Table 1.
  • the silver wool was obtained commercially (Aldrich: Catalog No. 295744)
  • the copper wire was taken out of a ground wire.
  • n-butyl isocyanate (HC value: 2471 ppm, content according to GC: 98.7%) submitted.
  • 3.0 g of Lewatit® SC 108 (cation exchanger) are introduced into the vessel. This mixture is heated at 60 0 C for 5 h. Then the Lewatit® is filtered off and the clear liquid is analyzed for HC value and isocyanate content.
  • An HC value of 316 ppm and a purity by GC analysis of 99.0% are found.
  • Example 8 (for comparison)
  • n-butyl isocyanate (HC value: 2471 ppm, content according to GC: 98.7%) submitted.
  • 3.0 g of Lewatit® MP 62 (anion exchanger) are introduced into the vessel. This mixture is heated at 6O 0 C for 5 h.
  • the Lewatit® is filtered off and the clear liquid is analyzed for HC value and isocyanate content.
  • An HC value of 48 ppm and a purity by GC analysis of 92.4% are found. Here at is a significant deterioration of the purity of the isocyanate to notice.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un procédé de libération prolongée d'isocyanates organiques ou de mélanges d'isocyanates organiques de composés chlorés, par mise en contact desdits isocyanates ou mélanges d'isocyanates avec un courant de gaz inerte hydraté, ou avec un matériau organique présentant une action d'échange cationique. Le procédé selon l'invention permet de libérer les isocyanates de composés chlorés tout en douceur, et est en particulier conçu pour les isocyanates sensibles à la température.
EP05815233A 2004-12-22 2005-12-10 Procede pour reduire les composants chlores dans les isocyanates organiques Withdrawn EP1831155A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200410063222 DE102004063222A1 (de) 2004-12-22 2004-12-22 Verfahren zur Reduktion von chlorhaltigen Komponenten in organischen Isocyanaten
DE200410063221 DE102004063221A1 (de) 2004-12-22 2004-12-22 Verfahren zur Reinigung organischer Isocyanate
PCT/EP2005/013277 WO2006072360A1 (fr) 2004-12-22 2005-12-10 Procede pour reduire les composants chlores dans les isocyanates organiques

Publications (1)

Publication Number Publication Date
EP1831155A1 true EP1831155A1 (fr) 2007-09-12

Family

ID=35962153

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05815233A Withdrawn EP1831155A1 (fr) 2004-12-22 2005-12-10 Procede pour reduire les composants chlores dans les isocyanates organiques

Country Status (7)

Country Link
US (1) US20080228006A1 (fr)
EP (1) EP1831155A1 (fr)
JP (1) JP2008524273A (fr)
CN (1) CN102351738A (fr)
BR (1) BRPI0519528A2 (fr)
IL (1) IL183874A0 (fr)
WO (1) WO2006072360A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2925498B1 (fr) * 2007-12-21 2010-04-02 Rhodia Operations Procede de reduction de l'acidite residuelle d'isocyanatosilanes
CN110396057B (zh) * 2019-07-16 2022-02-18 万华化学集团股份有限公司 一种制备低氯含量的异氰酸酯的方法
CN110982038B (zh) * 2019-12-27 2021-05-14 万华化学（宁波）有限公司 一种聚氨酯树脂及其制备方法
CN112098576B (zh) * 2020-08-27 2022-07-05 广州广电计量检测无锡有限公司 一种气质联用检测胶黏剂中1,3-双（1-异氰酸根-1-甲基乙基）苯的方法
CN116535334A (zh) * 2023-05-22 2023-08-04 南京工业大学 一种降低异氰酸酯中水解氯含量的方法

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DE1113570B (de) * 1957-04-20 1961-09-07 Bayer Ag Verfahren zur Herstellung von Kationenaustauschern auf Basis von nicht sprosspolymerisierten vernetzten Polymerisaten
DE1240849B (de) 1962-10-31 1967-05-24 Olin Mathieson Verfahren zur Herabsetzung der Konzentration des hydrolysierbaren Chlorids in einem organischen Isocyanat
US3219678A (en) * 1963-02-28 1965-11-23 Olin Mathieson Process for reducing the hydrolyzable chlorine content of organic isocyanates
US3458558A (en) * 1963-10-25 1969-07-29 Allied Chem Purification of isocyanates by reducing the hydrolyzable chlorine content
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US3759971A (en) * 1971-01-20 1973-09-18 Jefferson Chem Co Inc Purification of isocyanates
US3799963A (en) 1972-05-12 1974-03-26 Olin Corp Purification of isocyanates reducing the hydrolyzable chlorine and acid content
US3912600A (en) * 1974-05-09 1975-10-14 Upjohn Co Recovery of polymethylene polyphenyl polyisocyanate from a phoshenosed polyamine feed
US4049894A (en) * 1975-08-25 1977-09-20 The B. F. Goodrich Company Latex modified portland cement and use thereof in polymerization reactors
JPS5686146A (en) * 1979-12-14 1981-07-13 Mitsui Toatsu Chem Inc Preparation of lower aliphatic isocyanate
US4996351A (en) * 1987-01-27 1991-02-26 The Dow Chemical Company Process for reducing the quantity of hydrolyzable chlorides in isocyanates
US4904704A (en) * 1988-12-22 1990-02-27 The Dow Chemical Company Rigid foams prepared from treated toluene diisocyanate residue
US4962272A (en) * 1989-05-30 1990-10-09 Aristech Chemical Corporation Treatment of arsine removal catalysts
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Also Published As

Publication number Publication date
IL183874A0 (en) 2007-10-31
JP2008524273A (ja) 2008-07-10
US20080228006A1 (en) 2008-09-18
BRPI0519528A2 (pt) 2009-02-17
WO2006072360A1 (fr) 2006-07-13
CN102351738A (zh) 2012-02-15

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