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Electrochemical reduction for reducible dyes

An electrochemical and dye technology, applied in the field of electrochemical reduction, can solve the problem of low yield of indigo white

Inactive Publication Date: 2003-04-02
DYSTAR TEXITILFARBEN GMBH & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to this method, the yield of indigo is very low

Method used

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Examples

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Embodiment 1

[0073] Example 1. Example of electrochemical reduction of reducible dyes.

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Abstract

A process for an electrochemical reduction of a reducible dye by contacting said reducible dye with a cathode comprising a support of an electrically conductive material and an electrically conductive, cathodically polarized layer formed thereon in situ by alluviation comprises conducting said electrochemical reduction in the presence of a base.

Description

technical field [0001] The present invention relates to a process for the electrochemical reduction of reducible dyes. Background technique [0002] EP-A 0 808 920 discloses the electrochemical reduction of organic compounds in the presence of a cathode comprising a support of electrically conductive material and an electrically conductive cathodically polarized layer formed in situ thereon by alluvial action. See also this reference for background information on the electrochemical reduction of organic compounds. This document also mentions the possibility of reducing indigo to indigo white by its disclosed method, describes the application of Pd / C, Pt / C, Rh / C and Ru / C as materials for forming cathodically polarized layers, and states that The above reactions should be carried out in acidic medium. However, according to this method, the yield of indigo is very low. [0003] EP-B 0 426 832 also discloses a process for reducing dyes, in particular by...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/28C02F1/461C02F1/467C25B3/25D06P1/22D06P1/28D06P1/30D06P3/60D06P5/20
CPCD06P1/30C25B3/04C02F2001/46119C02F2001/46142C02F2001/46161C02F2101/308D06P1/221D06P5/2016C02F1/4676C25B3/25C25B11/043C25B11/046
Inventor C·墨克J·伯特赞姆G·胡伯N·戈伦德
Owner DYSTAR TEXITILFARBEN GMBH & CO
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