Continuous indigo blue electrochemistry reduction dyeing process

An electrochemical and indigo technology, applied in the field of vat dyeing technology, can solve the problems of affecting dyeing quality, low current density, high production cost, etc., achieve high reaction efficiency, reduce medium loss, and ensure quality

Inactive Publication Date: 2013-08-21
HANGZHOU SAILONG CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that Fe(II / III)-TEA is relatively expensive, and it will be taken away by cotton yarn when the concentration is high, which not only causes a large amount of loss but also affects the dyeing quality
Unfortunately, these reactors are still structurally too complex, too expensive to manufacture, and suitable for low current densities

Method used

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  • Continuous indigo blue electrochemistry reduction dyeing process
  • Continuous indigo blue electrochemistry reduction dyeing process
  • Continuous indigo blue electrochemistry reduction dyeing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In 0.2 mol / L NaOH aqueous solution, add indigo (0.02 mol / L), Fe 2 (SO 4 ) 3 (0.0005 mol / L), TEA (0.012 mol / L) and other substances are configured as the initial catholyte, and the electrolyte is passed into the electrochemical reactor (3) for electrolytic reduction. The temperature of the electrolytic reaction is 40°C, and the current density of the single-piece stainless steel cathode mesh is 0.2 A / dm 2 ; In the electrochemical reactor (3), the cathode is a piece of stainless steel mesh, the Nafion324 cationic membrane is a diaphragm, the anode is a ruthenium iridium electrode (purchased from Hangzhou Sailong Chemical Co., Ltd.), and the anolyte is 1 mol / L H 2 SO 4 . After 80% of the indigo is reduced to the leucosome, start to continuously output the electrolyte solution to the leucosome dilution tank (11) for dilution, and at the same time continuously input the dyed solution from the feeding tank (1) or the electrochemical reactor (3) at the same flow rate The...

Embodiment 2

[0035] In 0.2 mol / L NaOH aqueous solution, add indigo (2.0 mol / L), Fe 2 (SO 4 ) 3 (0.01 mol / L), TEA (0.15 mol / L) and other substances are configured as the initial catholyte, and the electrolyte is passed into the electrochemical reactor (3) for electrolytic reduction. The temperature of the electrolytic reaction is 60°C, and the current density of the single-piece stainless steel cathode mesh is 5 A / dm 2 ; In the electrochemical reactor (3), the cathode is 5 stainless steel meshes separated from each other, the Nafion117 cationic membrane is the diaphragm, the anode is the ruthenium iridium electrode, and the anolyte is 0.5 mol / L H 2 SO 4 . After 98% of the indigo is reduced to the leucosome, start to continuously output the electrolyte solution to the leucosome dilution tank (11) for dilution, and at the same time continuously input the dyed solution from the feeding tank (1) or the electrochemical reactor (3) at the same flow rate After filtering the dyeing solution, ...

Embodiment 3

[0038] At 1.0 mol / L Na 2 CO 3 In the aqueous solution, add indigo (1.0 mol / L), Fe 2 (SO 4 ) 3 (0.02 mol / L), TEA (0.3 mol / L) and other substances are configured as an electrolyte, and the electrolyte is passed into the electrochemical reactor (3) for electrolytic reduction. The temperature of the electrolytic reaction is 20°C, and the current density of the single-piece stainless steel cathode mesh is 2 A / dm 2 ; In the electrochemical reactor (3), the cathode is 10 stainless steel meshes separated from each other, the Nafion117 cationic membrane is a diaphragm, the anode is a ruthenium iridium electrode, and the anolyte is 0.5 mol / L H 2 SO 4 . After 95% of the indigo is reduced to the leucosome, start to continuously output the electrolyte solution to the leucosome dilution tank (11) for dilution, and at the same time continuously input the dyed solution from the feeding tank (1) or the electrochemical reactor (3) at the same flow rate After filtering the dyeing solutio...

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Abstract

The present invention discloses a continuous indigo blue electrochemistry reduction dyeing process, which is sequentially and continuously performed according to the following steps that: 1, under a low concentration medium condition, high concentration indigo blue is subjected to electrolysis reduction in a first electrochemistry reactor, the electrolyte is input into a leuco body dilution tank after 80-98% of the indigo blue is reduced into the leuco body, and concurrently the indigo blue and a dyeing liquid are added so as to maintain a indigo blue concentration in the first electrochemistry reactor; 2, the dyeing liquid is adopted to dilute the leuco body in the electrolyte into a required dyeing concentration in the leuco body dilution tank; 3, the diluted electrolyte in the step 2 is input into a dyeing machine, and a second electrochemistry reactor is adopted to control an electric potential of the dyeing liquid in the dyeing machine so as to completely convert the indigo blue into the leuco body; 4, the dyeing machine is opened after the electric potential of the dyeing liquid in the dyeing machine is stabilized so as to absorb the leuco body by cotton yarns; and 5, a filtration treatment is performed on the dyeing liquid used in the step 4, and recycling is performed. With the present invention, media loss can be reduced, dyeing work efficiency can be increased, and dyeing quality can be ensured.

Description

Technical field: [0001] The invention relates to a vat dyeing process of indigo, more specifically, relates to a continuous indigo electrochemical vat dyeing process. technical background: [0002] Indigo is a kind of indigo with a history of more than 3,000 years, but it still has a very important position in the current dyeing industry. Indigo is mainly used in the dyeing of jeans. Currently, the average annual market demand for this type of jeans is about 1 billion. If each pair of jeans needs to use 10 grams of indigo, the annual consumption of indigo is 10,000 tons. The dyeing principle of indigo is shown in formula 1: after indigo is reduced in alkaline aqueous solution, a soluble leucosome is formed, which has good adhesion on the fiber fabric, and after the leuco body is evenly attached to the fiber fabric, Oxidation with air makes it insoluble indigo. [0003] [0004] The dyeing principle of formula 1 indigo [0005] At present, the main reducing agent used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06P1/22D06P1/642D06P3/60D06P5/20
Inventor 马淳安徐颖华毛信表赵峰鸣褚有群
Owner HANGZHOU SAILONG CHEM IND
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