Two-component complexing system indirect electrochemical reduction method and system for indigo dye and preparation method of system

An indigo dye, electrochemical technology, applied in the direction of dyeing method, electrolysis process, electrolysis components, etc., can solve the problems of complexity, low current efficiency, long reduction time, etc., and achieve the goal of improving current efficiency, reducing energy consumption, and saving costs Effect

Inactive Publication Date: 2017-06-20
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in recent years, the electrochemical reduction of indigo dye has also been studied to a certain extent, such as the multi-cathode reduction device and continuous reduction device described in patent CN 1320202 C and patent CN 103255642 A, and the reduction system used is iron-triethanolamine , Yanhua stone, etc., but the system is relatively complicated, but the reduction of indigo with this system takes a long time and the current efficiency is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In 0.1mol / L sodium hydroxide aqueous solution, add successively to 0.001mol / L ferric sulfate, 0.02mol / L triethanolamine, 0.0001mol / L calcium gluconate, 0.001mol / L indigo and fully stir to obtain catholyte, will The electrolytic solution is added to the electrolytic cell for reduction, the electrolytic reduction temperature is 50°C, the electrolytic current density is 0.14 A / dm2, and the electric reduction is carried out for 1 hour, and the measured current efficiency is 81.7%. When indigo is completely converted into leuco , the dye solution changes from an opaque solution to a transparent solution.

Embodiment 2

[0031] In 1mol / L sodium hydroxide aqueous solution, add successively to 0.01mol / L iron sulfite, 0.3mol / L triethanolamine, 0.001mol / L calcium gluconate, 0.001mol / L indigo and carry out thorough stirring to obtain catholyte, will The electrolytic solution is added to the electrolytic cell for reduction. The electrolytic reduction temperature is 50°C, the electrolytic current density is 0.13 A / dm2, and the electrolytic reduction is carried out for 1 hour. The measured current efficiency is 79.1%. When the indigo is completely converted into a leuco , the dye solution changes from an opaque solution to a transparent solution.

Embodiment 3

[0033] In 0.5mol / L sodium hydroxide aqueous solution, add successively to 0.05mol / L ferric chloride, 1.25mol / L triethanolamine, 0.01mol / L calcium gluconate, 0.005mol / L indigo and fully stir to obtain catholyte, Add the electrolyte solution to the electrolytic cell for reduction. The electrolytic reduction temperature is 50°C, the electrolytic current density is 0.09 A / dm2, and the current efficiency is 84.6% when the indigo is completely converted into leuco body, the dye solution changes from an opaque solution to a transparent solution.

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Abstract

The invention belongs to the technical field of indigo dye reduction dying and particularly relates to a two-component complexing system indirect electrochemical reduction method and system for an indigo dye and a preparation method of the system. The preparation method comprises the steps that 1, under the alkaline condition, Fe(II / III) salt is fully mixed with triethanolamine, so that a complexing system is obtained; and 2, gluconate is added to the complexing system obtained in step 1, so that a two-component complexing system is obtained. The indirect electrochemical reduction method comprises the step that under protection of protective gas, the two-component complexing system serves as a medium, indirect electrochemical reduction is conducted on the indigo dye in an electrolytic cell at the temperature of 25-75 DEG C and under the alkaline condition. According to the two-component complexing system indirect electrochemical reduction method and system for the indigo dye and the preparation method of the system, the mixed medium of a certain condition is jointly formed by gluconic acid and iron-triethanolamine, and the synergistically-reinforcing effect can be achieved; the current required in the energized reduction process is reduced, reduction time is shortened, and thus current efficiency is improved; and energy consumption is remarkably lowered, and cost is saved.

Description

technical field [0001] The invention belongs to the technical field of vat dyeing of indigo, and in particular relates to an indirect electrochemical reduction method, system and preparation method of a two-component complex system of indigo dye. Background technique [0002] Indigo dye belongs to vat dye, which is widely used in the dyeing and finishing industry, especially the dyeing of denim. However, indigo is insoluble in water and has no affinity for cellulose fibers. Under the conditions of alkali and reducing agent, indigo can only be dyed by being reduced to soluble leucosomes. Sodium hydrosulfite (sodium dithionite) is widely used in industrial production as a strong reducing agent, but it is easy to decompose and produces a large amount of dark-colored, highly alkaline, and refractory sulfur wastewater, which will cause serious environmental pollution. [0003] The principle of indigo dyeing is as follows: after indigo is reduced in alkaline aqueous solution, a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B3/04D06P1/22C25B3/25
CPCD06P1/228C25B3/25
Inventor 易长海谭晓东周阳徐杰邹汉涛刘雪亭左丹英黄平张进
Owner WUHAN TEXTILE UNIV
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