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Anolyte for indirect electrochemical dyeing of vat dyes

An anolyte, electrochemical technology, applied in the field of vat dye dyeing, can solve the problems of corrosion of electrode materials, low conduction current, poor dyeing effect, etc., and achieve the effects of excellent electrical conductivity, increased conduction current, and strong ability to conduct electrons

Active Publication Date: 2021-06-01
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems of severe corrosion of electrode materials, low conduction current and poor dyeing effect of existing anolyte, the invention provides an anolyte for indirect electrochemical dyeing of vat dyes

Method used

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Examples

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Effect test

Embodiment 1

[0023] An embodiment of the present invention provides an electrolyte for indirect electrochemical dyeing of vat dyes, which includes an anolyte and a catholyte, wherein the anolyte is a 0.1mol / L sodium bisulfite solution, and the catholyte is composed of The following components are fully stirred to obtain: 0.01mol / L sodium hydroxide aqueous solution, 0.02mol / L ferrous sulfate, 0.01mol / L triethanolamine, 0.005mol / L sodium gluconate and 0.01mol / L indigo, the cathode and Add the anolyte to the electrolytic cell for reduction, the electrolytic reduction temperature is 25° C., the voltage is 3.50 V, and the electrolytic reduction is performed for 1 hour to obtain the dye liquor. Record the electrolysis current, reduction potential and reduction time of the dye solution from opaque solution to transparent solution.

Embodiment 2

[0038] The embodiment of the present invention provides an electrolyte for indirect electrochemical dyeing of vat dyes, which includes an anolyte and a catholyte, wherein the anolyte is a 2mol / L sodium metabisulfite solution, and the catholyte consists of the following groups: Stir thoroughly to obtain: 0.5mol / L sodium hydroxide aqueous solution, 0.075mol / L ferrous sulfate, 0.075mol / L triethanolamine, 0.075mol / L sodium gluconate and 0.0375mol / L indigo, respectively, the cathode and anolyte Add it to the electrolytic cell for reduction, the electrolytic reduction temperature is 25°C, the voltage is 3.50V, and the electricity is reduced for 1 hour to obtain the dye liquor. Record the electrolysis current, reduction potential and reduction time of the dye solution from opaque solution to transparent solution.

Embodiment 3

[0049] An embodiment of the present invention provides an electrolyte for indirect electrochemical dyeing of vat dyes, which includes an anolyte and a catholyte, wherein the anolyte is a mixed solution of 0.5 mol / L sodium sulfite and 0.5 mol / L sodium metabisulfite , the catholyte is obtained by fully stirring the following components: 0.5mol / L sodium hydroxide aqueous solution, 0.075mol / L ferrous chloride, 0.075mol / L triethanolamine, 0.075mol / L sodium gluconate and 0.025mol / L To reduce olive green, the cathode and anode electrolytes were respectively added to the electrolytic cell for reduction. The electrolytic reduction temperature was 50° C., the voltage was 3.50 V, and the reduction was carried out for 1 hour to obtain a dye solution. Record the electrolysis current, reduction potential and reduction time of the dye solution from opaque solution to transparent solution.

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PUM

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Abstract

The invention relates to the technical field of vat dye dyeing, in particular to an anolyte for indirect electrochemical dyeing of vat dyes, the electrolyte of which includes sulfite, pyrosulfite, dithionite or thiocyanate at least one. The present invention adopts an electrolyte with excellent electrical conductivity and less side reactions and weak reducibility, and selects sulfite, pyrosulfite, dithionite or thiocyanate as the anode electrolyte, which has a strong ability to conduct electrons, and can be used on the anode. The reaction is fast, the product is sulfate, clean and environmentally friendly, the dyeing process under this system is simple, the reduction time is shortened, and the current efficiency is high, which is conducive to the realization of industrial production and has good application prospects. It solves the traditional anolyte such as sulfuric acid and other electrode corrosion Serious, poor safety, long recovery time, low current efficiency and other problems.

Description

technical field [0001] The invention relates to the technical field of vat dye dyeing, in particular to an anolyte used for indirect electrochemical dyeing of vat dyes. Background technique [0002] Vat dyes have complete chromatograms, bright colors and excellent color fastness, especially high light fastness and chlorine fastness. They are widely used in the dyeing of cellulose fibers and inner cotton components of polyester / cotton blended fabrics. Compared with the traditional chemical reduction method, the electrochemical reduction method uses clean electrons as the reducing agent, which greatly reduces the amount of reducing agent and the discharge of waste water, and has a very good industrial application prospect. Electrochemical dyeing is mainly divided into direct electrochemical reduction and indirect electrochemical reduction methods, of which indirect electrochemical methods have been studied more. In the indirect electrochemical reduction method, the role of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/22D06P1/00C25B1/00
Inventor 姚继明李晓燕汪康康张维
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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