WO2004024826A2 - Verfahren zur herstellung von hochreinem indigo - Google Patents
Verfahren zur herstellung von hochreinem indigo Download PDFInfo
- Publication number
- WO2004024826A2 WO2004024826A2 PCT/EP2003/009363 EP0309363W WO2004024826A2 WO 2004024826 A2 WO2004024826 A2 WO 2004024826A2 EP 0309363 W EP0309363 W EP 0309363W WO 2004024826 A2 WO2004024826 A2 WO 2004024826A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- indigo
- leucoindigo
- purity
- solutions
- production
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B7/00—Indigoid dyes
- C09B7/02—Bis-indole indigos
Definitions
- the invention is in the technical field of vat dyes.
- Indigo is a vat dye that has been known for a long time and is used for dyeing textile material containing celiulose, in particular cotton cotton for blue denim articles.
- indigo still contains impurities, for example up to 0.6% by weight of aniline and 0.4% by weight of N-methylaniline, as well as other organic impurities that one would like to remove. These impurities are firmly built into the crystal structure of the indigo and can therefore not be removed either by stirring with solvent or by steam distillation.
- the water-insoluble indigo For dyeing, the water-insoluble indigo must first be converted into the water-soluble fiber-affine leuco form by reduction, which is then oxidized again to the water-insoluble indigo after being drawn onto the material to be colored.
- An ecologically advantageous dyeing process is known from WO-A-94/23114, in which indigo is used in the form of the alkaline, aqueous leucoindigo solution obtained by catalytic reduction of an indigo suspension, and a drastic reduction in the wastewater pollution caused by sulfite / which occurs in the conventional dyeing processes. Allows sulfate or organic substances.
- the invention thus relates to a process for the production of high-purity indigo, characterized in that aromatic amines, in particular aniline and N-methylaniline up to a content of ⁇ 200 ppm, are separated from leucoindigo solutions with exclusion of air.
- aromatic amines in particular aniline and N-methylaniline up to a content of ⁇ 200 ppm
- the leucoindigo solutions obtained in this way can be used directly for dyeing or oxidized to indigo.
- all common methods for separating liquids are suitable.
- Particular embodiments of the present invention relate, on the one hand, to extraction and, on the other hand, to distillation, it being possible for the distillation to be carried out with and without steam or by stripping with an inert gas.
- a very special embodiment of the present invention relates to the separation by distillation of aromatic amines from highly concentrated leucoindigo solutions with exclusion of air at boiling temperature, high-purity leukoindigo solutions with a leukoindigo content of up to 55% by weight and A content of aromatic amines ⁇ 200 ppm are accessible.
- the distillation can be carried out under normal pressure or reduced pressure.
- Another very special embodiment of the present invention relates to steam distillation at normal pressure, high-purity dilute leucoindigo solutions containing aromatic amines below the detection limit being obtained
- a very special embodiment of the present invention relates to extraction with a water-immiscible organic solvent, such as, for example, toluene, .xylenes, perchlorethylene, chlorobenzene, methylisopropyl ether, n-hexanol, 2-ethylhexanol, cyclohexane, cyclohexanone, petroleum ether of a suitable boiling range.
- a water-immiscible organic solvent such as, for example, toluene, .xylenes, perchlorethylene, chlorobenzene, methylisopropyl ether, n-hexanol, 2-ethylhexanol, cyclohexane, cyclohexanone, petroleum ether of a suitable boiling range.
- Aqueous solutions of leukoindigo are usually obtained by reducing an indigo suspension.
- Dithionite, thiourea, hydroxyacetone and homologous organic reducing agents, electrochemical processes or hydrogen in combination with hydrogenation catalysts, such as Raney nickel, are suitable as reducing agents.
- hydrogenation catalysts such as Raney nickel
- EP 1097184 discloses highly concentrated leucoindigo solutions consisting of leukoindigo in the form of the leukoindigo salt of a mixture of at least two alkali metal hydroxides.
- the separation process according to the invention is applied to these leucoindigo solutions, it is possible to obtain high-purity leukoindigo solutions whose leukoindigo content is up to 55% by weight, with aniline and N-methylaniline content ⁇ 200 ppm.
- leuco indigo solutions purified by the processes according to the invention can be used directly for dyeing. They are advantageously suitable for dyeing cellulose-containing textile material, it being possible to proceed as described in WO-A-94/23114.
- Leucoindigo solutions according to the invention can be used by oxidation for the production of high-purity indigo.
- the leucoindigo solution thus prepared is subjected to distillation at normal pressure by passing a weak stream of nitrogen at a bath temperature of 140 ° C. to a concentration of 55% by weight of leucoindigo.
- the leucoindigo solution prepared in this way contains ⁇ 200 ppm aniline and ⁇ 20 ppm N-methylaniline. It can be used directly for dyeing or oxidized to indigo in the conventional way.
- the leucoindigo solution prepared according to Example 1 is stirred with 750 ml of toluene under nitrogen inertization for 1 hour at room temperature. Then the phases are separated. The aqueous phase contains the leuco indigo solution. It contains 1530 ppm aniline and 213 ppm N-methylaniline based on the indigo contained. The extraction is repeated twice, the aniline content dropping to 147 ppm, and N-methylaniline is no longer detectable
- the leucoindigo solution prepared according to Example 1 is heated to 85 ° C. with nitrogen inerting and stripped with nitrogen for 5 hours with stirring. 1000 ml of water are distilled off. This amount is then through Fresh water replaced again. A 23% by weight leukoindigo solution with an aniline content of 113 ppm, based on leukoindigo, is obtained. N-methylaniline is no longer detectable.
- the leucoindigo solution prepared according to Example 1 is distilled with steam for 3 hours. A 7% by weight leukoindigo solution is obtained in which neither aniline nor N-methylaniline can be detected.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Indole Compounds (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003260454A AU2003260454A1 (en) | 2002-08-31 | 2003-08-23 | Method for the production of high-purity indigo |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10240258.2 | 2002-08-31 | ||
DE10240258 | 2002-08-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004024826A2 true WO2004024826A2 (de) | 2004-03-25 |
Family
ID=31983890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/009363 WO2004024826A2 (de) | 2002-08-31 | 2003-08-23 | Verfahren zur herstellung von hochreinem indigo |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2003260454A1 (de) |
WO (1) | WO2004024826A2 (de) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104897665A (zh) * | 2015-06-10 | 2015-09-09 | 山东出入境检验检疫局检验检疫技术中心 | 染色纺织品中禁用偶氮染料的一步显色筛查法 |
EP3441429A1 (de) | 2017-08-11 | 2019-02-13 | Archroma IP GmbH | Gereinigte konzentrierte wässrige leucoindigo-salzlösungen |
EP3441431A1 (de) | 2017-08-11 | 2019-02-13 | Archroma IP GmbH | Verfahren zur herstellung von leucoindigo-salzlösungen mit sehr niedrigem anilingehalt |
EP3441430A1 (de) | 2017-08-11 | 2019-02-13 | Archroma IP GmbH | Leucoindigo-salzlösung mit sehr niedrigem gehalt von anilin und verfahren zur herstellung davon |
WO2019030391A1 (en) | 2017-08-11 | 2019-02-14 | Archroma Ip Gmbh | SALT SOLUTION OF LEUCOINDIGO HAVING VERY LOW ANILINE CONTENT AND PROCESS FOR PREPARING THE SAME |
EP3569660A1 (de) | 2018-05-18 | 2019-11-20 | Archroma IP GmbH | Verfahren und vorrichtung zur herstellung von anilinfreien leucoindigo-salzlösungen |
EP3754053A1 (de) | 2020-05-04 | 2020-12-23 | Lenzing Aktiengesellschaft | Spinngefärbte zellulosefaser |
WO2021102530A1 (pt) | 2019-11-28 | 2021-06-03 | Bann Química Ltda. | Processo de purificação de soluções de sal de leucoíndigo empregando um gás inerte |
-
2003
- 2003-08-23 WO PCT/EP2003/009363 patent/WO2004024826A2/de not_active Application Discontinuation
- 2003-08-23 AU AU2003260454A patent/AU2003260454A1/en not_active Abandoned
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JP7527337B2 (ja) | 2017-08-11 | 2024-08-02 | アルフローマ アイピー ゲゼルシャフト ミット ベシュレンクテル ハフツング | アニリン不含ロイコインジゴ塩溶液を製造するための方法およびデバイス |
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WO2019030391A1 (en) | 2017-08-11 | 2019-02-14 | Archroma Ip Gmbh | SALT SOLUTION OF LEUCOINDIGO HAVING VERY LOW ANILINE CONTENT AND PROCESS FOR PREPARING THE SAME |
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Also Published As
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