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EP0505464A1 - Procede pour blanchir en continu des liquides avec de l'ozone - Google Patents

Procede pour blanchir en continu des liquides avec de l'ozone

Info

Publication number
EP0505464A1
EP0505464A1 EP19910901473 EP91901473A EP0505464A1 EP 0505464 A1 EP0505464 A1 EP 0505464A1 EP 19910901473 EP19910901473 EP 19910901473 EP 91901473 A EP91901473 A EP 91901473A EP 0505464 A1 EP0505464 A1 EP 0505464A1
Authority
EP
European Patent Office
Prior art keywords
liquid
bleached
ozone
bleaching
reaction chamber
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Withdrawn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
EP19910901473
Other languages
German (de)
English (en)
Inventor
Paul Schulz
Stefanie MÜLLER
Stefan Hammelstein
Keith Neary
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP0505464A1 publication Critical patent/EP0505464A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07H—SUGARS; DERIVATIVES THEREOF; NUCLEOSIDES; NUCLEOTIDES; NUCLEIC ACIDS
    • C07H15/00—Compounds containing hydrocarbon or substituted hydrocarbon radicals directly attached to hetero atoms of saccharide radicals
    • C07H15/02—Acyclic radicals, not substituted by cyclic structures
    • C07H15/04—Acyclic radicals, not substituted by cyclic structures attached to an oxygen atom of the saccharide radical
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/147—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications
    • D21C9/153—Bleaching ; Apparatus therefor with oxygen or its allotropic modifications with ozone

Definitions

  • the present invention relates to a continuous process for bleaching viscous liquid products with gaseous ozone.
  • Chemical-technical products are often more or less strongly colored due to production, although the corresponding substances are colorless in their purest form.
  • the colored impurities often interfere with the application or further processing of the technical products, so that they are generally cleaned, or at least optically brightened, by a bleaching process, often directly after their production.
  • Such bleaching processes are normally based on chemical changes, which should preferably be irreversible.
  • the bleaching reagent should not only attack the colored by-products themselves, but also the precursors of these substances, which are usually also present in the technical products and can form colored contaminants again during storage and thus the Influence color stability of the bleached product.
  • oxidation and reduction reactions can be considered as chemical reactions which can usually be used for bleaching.
  • the usual reductive bleaching agents are sulfites, hydrogen sulfites and SO2 . Dithionites, boranates and hydrogen in the presence of hydrogenation catalysts. Bleaches which have an oxidative effect are usually used which release active oxygen or active chlorine. Examples of such bleaching agents are hydrogen peroxide, alkali peroxides, perborates, persulfates, percarbonates, and hypochlorites, which are normally used in the form of aqueous solutions, and chlorine dioxide, elemental chlorine, elemental oxygen and ozone, which are used either as aqueous solutions or in gaseous form.
  • the products to be bleached are usually in a more or less easily mobile form in order to facilitate the reaction with the bleaching agent.
  • Liquids to be bleached are used either as such or diluted as solutions.
  • Solids to be bleached, for example cellulose are usually reacted as slurries or pastes with the bleaching agents present in liquid or gaseous form.
  • Gaseous bleaching agents for example chlorine, oxygen or ozone
  • the surface of suspended solids with sufficiently fast kinetics must adsorb, which can only be facilitated by " more or less complex mixing techniques, for example using packed columns or bubble columns, only in the case of relatively low-viscosity liquids, which should not or only slightly foam can.
  • a preferred embodiment of the process according to the invention consists in conveying or allowing the liquid to be bleached to flow continuously or, where appropriate, using gravity, in the form of a thin film on the inner wall of a preferably vertically arranged tubular reaction chamber, and in the meantime with the gaseous ozone, which preferably moves in countercurrent to the liquid.
  • the low layer thickness of the liquid phase which is preferably 0.05 mm to 2 mm, promotes both the ozone uptake and its distribution in the liquid.
  • rollers, blades or wipers rotating around the central axis of the chamber can be useful to use rollers, blades or wipers rotating around the central axis of the chamber, as are customary in thin-film evaporators.
  • Such rotor elements can consist, for example, of elastically pressed blades or rigid elements with constant wall distances.
  • the layer thickness and the flow speed of the liquid phase can be regulated as required by the type and arrangement of the rotor elements used and their speed of rotation.
  • ozone is preferably in, for example, a carrier gas which is largely inert under the reaction conditions Oxygen, nitrogen or air, diluted form used, the concentration of the ozone in the mixture with the carrier gas is preferably 1-10 vol .-%.
  • the process according to the invention preferably works with a gaseous phase under normal pressure, slight overpressures being able to occur in the reaction chamber, for example due to the fact that the gaseous phase is passed through a downstream ozone destruction system after flowing through the reaction chamber.
  • the linear gas flow rates in the reaction chamber are preferably 0.1 m / s or less.
  • the contact time of the gaseous ozone with the liquid to be bleached can be influenced by the flow rate of both the liquid phase and the gaseous phase. It is preferably between 0.1 and 10 minutes.
  • the desired reaction temperature which in the bleaching process according to the invention is preferably between 10 ° C. and 60 ° C., but depending on the product to be bleached, this range may also lie outside the heating chamber on the outside of the reaction chamber Cooling facilities are located; the outside of the reaction chamber is preferably wholly or partially shaped as a hollow body through which a heatable and / or coolable liquid medium is passed.
  • the bleached product can be subjected again to the bleaching process according to the invention. This can be done either by recycling the bleached liquid product several times into the reaction chamber that has already passed through, or by using one or more further reaction chambers connected downstream, so that the total contact time with the ozone increases accordingly.
  • the bleaching process according to the invention is in principle suitable for all flowable or pumpable liquid products. It is irrelevant whether the products themselves are highly viscous liquids or from solutions, emulsions or suspensions of chemical-technical products in an inert Solvents, especially water, exist. If they do not already arise during the manufacture of the chemical-technical product to be bleached, such solutions can be produced, for example, by the process described in the ' European patent application EP 365 831.
  • the process according to the invention can preferably be used for bleaching those products which have viscosities between 100 mPa-s and 1 000 000 mPa-s at 20 ° C.
  • the pH of the liquid products to be bleached should preferably be neutral or acidic before entering the reaction chamber, so that the spontaneous ozone decomposition accelerated under alkaline conditions and thus the ozone consumption is minimized. If the product to be bleached has an alkaline pH, this can be reduced by adding acids that are compatible with the product, which may include, for example, acetic acid or hydrochloric acid.
  • the relatively highly viscous liquid products which can be bleached by the process according to the invention include, in particular, aqueous solutions of alkylglycosides of the formula (I),
  • n is a number between 1 and 10, which can also be broken as an analytically determined arithmetic size
  • R is an aliphatic radical with 1 to 30 carbon atoms.
  • the preparation of such alkyl glycosides is described, for example, in US Pat. Nos. 3,219,656, 3,547,828, 3,839,318, European Patent Applications EP 92355, EP 165721, EP 301 298 and EP 377 883.
  • the alkyl glycosides are normally obtained in the form of more or less strongly colored aqueous solutions and, as described in the documents mentioned, have hitherto been bleached in a batch process, for example by adding aqueous H2 O 2 solutions and heating to, for example, 100 ° C., which has the disadvantages of the additional dilution , the occurrence of by-products resulting from oxidative product degradation, for example aliphatic carboxylic acids, and the compulsion to destroy excess oxidizing agent present in the product.
  • These disadvantages are overcome by the bleaching process according to the invention, which provides practically oxidizer-free products which are largely free from impurities caused by oxidative product degradation and which have hook and loop numbers of about 5 to about 50.
  • a 50 weight percent aqueous crude alkyl glycoside solution made from glucose and essentially according to the method described in European patent application EP 301 298, which has a viscosity at 20 ° C. of 5000 mPa-s (Brookfield, spindle No. 5, 10 revolutions per minute), a pH of 5.5 and had a Velcro number of 200, would be by a thin-film system (Buss-SMS T 100, ratio height ' to diameter 7: 1, inner surface 0.3 m ⁇ ) with centrifugal ' pressed wiper blades (linear wiper speed 3.75 m / s) directed.
  • Buss-SMS T 100 ratio height ' to diameter 7: 1, inner surface 0.3 m ⁇
  • the throughput of the liquid phase through the reaction chamber was 60 kg / m ⁇ • h, the residence time of the liquid phase in the reaction chamber was about 2 minutes.
  • a gas stream consisting of air containing 2.5% by volume of ozone was directed against the liquid in such an amount that about 1.5 g of ozone accounted for 1 kg of liquid phase.
  • the reaction temperature was kept at about 40 ° C. by heating the reaction chamber over the double tube jacket (heating liquid water with a temperature of approximately 50 ° C.). After bleaching and vacuum degassing, the product had a color number according to Klett a ) of 30.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biotechnology (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Molecular Biology (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Detergent Compositions (AREA)
  • Saccharide Compounds (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Dans un procédé pour blanchir en continu des liquides visqueux, un film mince du liquide est mis en contact avec de l'ozone gazeux. Ce procédé convient notamment pour blanchir des alkylglycosides.
EP19910901473 1989-12-11 1990-12-03 Procede pour blanchir en continu des liquides avec de l'ozone Withdrawn EP0505464A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893940827 DE3940827A1 (de) 1989-12-11 1989-12-11 Verfahren zum kontinuierlichen bleichen von fluessigkeiten mit ozon
DE3940827 1989-12-11

Publications (1)

Publication Number Publication Date
EP0505464A1 true EP0505464A1 (fr) 1992-09-30

Family

ID=6395204

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910901473 Withdrawn EP0505464A1 (fr) 1989-12-11 1990-12-03 Procede pour blanchir en continu des liquides avec de l'ozone

Country Status (3)

Country Link
EP (1) EP0505464A1 (fr)
DE (1) DE3940827A1 (fr)
WO (1) WO1991009043A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5432275A (en) * 1994-02-25 1995-07-11 Henkel Corporation Continuous bleaching of alkylpolyglycosides
DE4431852A1 (de) * 1994-09-07 1996-03-14 Huels Chemische Werke Ag Verfahren zur Bleichung von Alkylpolyglycosiden
DE4431856A1 (de) * 1994-09-07 1996-03-14 Huels Chemische Werke Ag Verfahren zur Herstellung von Alkylpolyglycosiden
EP0712857B1 (fr) 1994-11-18 1998-05-27 Th. Goldschmidt AG Procédé pour la préparation d'alkylglycosides
DE19535031A1 (de) * 1995-09-21 1997-03-27 Goldschmidt Ag Th Verfahren zur Auftrennung von Alkylglycosiden
EP1042338B1 (fr) 1997-11-22 2004-04-07 Lg Chemical Limited Procede de preparation d'alkyle glycosides transparents et faiblement colores

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3980669A (en) * 1972-02-09 1976-09-14 Colgate-Palmolive Company Continuous process for manufacturing gamma sultones
JPS5318496A (en) * 1976-08-05 1978-02-20 Mitsui Mining & Smelting Co Continuous decoloring and refining process and device of concentrated sulfuric acid
JPS60501565A (ja) * 1983-06-14 1985-09-19 ウエヤ−ハウザ−・カンパニ− 低濃度オゾン漂白反応装置
US4557729A (en) * 1984-05-24 1985-12-10 A. E. Staley Manufacturing Company Color stabilization of glycosides
DE3910269A1 (de) * 1989-03-30 1990-10-11 Huels Chemische Werke Ag Verfahren zur herstellung von alkylpolyglycosiden

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9109043A1 *

Also Published As

Publication number Publication date
DE3940827A1 (de) 1991-06-13
WO1991009043A1 (fr) 1991-06-27

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