Recovery method of alkali-washable disperse dye hydrolysate

A technology of disperse dyes and hydrolyzate, applied in the direction of organic dyes, water pollutants, azo dyes, etc., can solve the problem of large acid consumption, and achieve the effect of cost saving
CN111978202AActive Publication Date: 2020-11-24浙江理工大学上虞工业技术研究院有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江理工大学上虞工业技术研究院有限公司
Publication Date
2020-11-24

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Abstract

The invention discloses a recovery method of alkaline-washable disperse dye hydrolysate. The method comprises the following steps: performing alkaline washing on a fabric dyed by alkaline-washable disperse dye in a 0.1-1g / L NaOH aqueous solution to obtain an alkaline washing liquid, wherein the alkaline washing liquid contains hydrolysate-carboxylate dye formed by hydrolyzing the alkaline-washabledisperse dye; adding a calcium chloride saturated solution into the alkaline washing liquid until the molar ratio of calcium chloride to carboxylate dye is (2-6):1; after uniformly stirring, performing standing for 24+ / -2 hours; and performing filtering to obtain a filtrate, namely an alkali washing solution obtained by recovering the hydrolysis product of the alkaline-washable disperse dye. Thecarboxylate dye is recovered by adopting salting-out instead of acid precipitation, so that a large amount of acid is prevented from being used for neutralizing an alkali washing solution, and the cost is saved.
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Description

technical field

[0001] The invention relates to a method for recovering alkali-washable disperse dyes and hydrolyzed dyes. Background technique

[0002] Disperse dyes are a class of non-ionic dyes with low water solubility, mainly used for dyeing polyester fibers. In 2018, the global annual output of disperse dyes was about 650,000 tons, accounting for about half of the total output of dyes.

[0003] Azo dyes are the most productive type of disperse dyes, and their advantages are simple synthesis, good color development and low cost. Due to the low solubility of disperse dyes in water, the fibers need to be suspended in the water system with the help of dispersants to dye the fibers, and some dye aggregates are adsorbed on the surface of the fibers during the dyeing process to form floating colors. Dye floating not only affects the vividness of the fabric, but also reduces its color fastness. Therefore, after the polyester fabric is dyed, it is usually necessary to remove...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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