Dyeing apparatus for electrochemical reduction of cotton yarns

Abstract

The invention relates to a dyeing apparatus for electrochemical reduction of cotton yarns. The dyeing apparatus comprises an electrolytic bath reduction device, a dye concentration on-line monitoring device and a dyeing tank, wherein the electrolytic bath reduction device comprises an electrolytic bath, an anode connected with a positive electrode of a power supply and a cathode connected with a negative electrode of the power supply; an ion exchange isolation membrane is arranged in the electrolytic bath to form an anode region and a cathode region of the electrolytic cell; the anode is arranged in the anode region of the electrolytic bath; the cathode is arranged in the cathode region of the electrolytic bath and is connected with a translation device; the dyeing tank is connected with the cathode region of the electrolytic bath through a first pipeline; and the cathode region of the electrolytic bath is provided with the dye concentration on-line monitoring device in a connecting manner. Through the dyeing apparatus, electrolytic reduction speed of a dye can be increased, and current efficiency can be increased.

Description

technical field [0001] The invention relates to the technical field of electrochemical reduction dyeing, in particular to a dyeing device for electrochemical reduction of cotton yarn. Background technique [0002] Most of vat dyes belong to polycyclic aromatic compounds, which do not contain water-soluble groups such as sulfonic acid groups and carboxylic acid groups in their structures. They need to undergo a reduction process to generate soluble leuco sodium salts before they can be dyed into fibers. In traditional processes, hydrosulfite is mostly used as its reducing agent, but it will produce a large amount of wastewater containing sulfate in industry, and will also decompose to produce acid gases such as hydrogen sulfide, which does not meet the requirements of green chemistry. [0003] The traditional vat dye dyeing method has caused great harm to the environment. Therefore, in recent years, some new vat dyeing technologies have been researched and developed. Among th...

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Problems solved by technology

But because the medium can only get electrons by contacting the surface of the cathode, the current efficiency is relatively low. 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 speed can be accelerated. In actual production, it is necessary to provide multiple power sources as the power supply, which also causes excessive power consumption in the production cost

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