Dyeing device for electrochemical reduction

Abstract

The invention relates to a dyeing device for electrochemical reduction. The device comprises an anode, a cathode and an ion exchange membrane isolating the anode from the cathode, wherein an anode region and a cathode region are respectively formed between the ion exchange membrane and the anode and between the ion exchange membrane and the cathode; the cathode is a centrifugal systematic cathode; the centrifugal systematic cathode comprises electrode plates and round electrode clamp slots; the electrode plates are round serrated impellers; the electrode plates and the electrode clamp slots are connected with a rotating device and have rotation directions opposite to the rotation direction of the rotating device; besides, a stirring device and an electrode rod connected with a reduction potentiometer are installed in the cathode region. The device improves the current efficiency, increases the rate of reducing dyes in an electrolytic manner and is suitable for industry.

Description

technical field [0001] The invention belongs to the field of dyeing devices, in particular to an electrochemical reduction dyeing device. Background technique [0002] Vat dyes are mostly polycyclic aromatic compounds, and their structures do not contain water-soluble groups such as sulfonic acid groups and carboxylic acid groups. They need to undergo a reduction process to form soluble leucosome sodium salts before they can be dyed into fibers. In the traditional process, hydrosulfite is mostly used as its reducing agent, but it will produce a large amount of sulfate-containing wastewater in industry, and it will also decompose to produce acid gases such as hydrogen sulfide, which does not meet the requirements of green chemistry. [0003] The traditional vat dyeing method has caused great harm to the environment. Therefore, in recent years, people have been researching and developing some new vat dyeing technologies. Among them, the clean and easy-to-realize automatic cont...

AI Technical Summary

Problems solved by technology

However, because the medium can only get electrons when it contacts the surface of the cathode, the current efficiency is low and the reduction time is long. Although Hong Kong Yang Lijian proposed to adopt the form of multi-cathode (CN1644790A, July 27, 2005), the electrolysis area can be increased and the reduction can be accelerated. Speed, but this requires that in actual production, multiple power supplies should be provided as power supplies, and it also causes excessive power consumption in production costs

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