Method for recycling mixed alkali liquor from after-treatment washing process of indigo

A washing process and alkali mixing technology, which is applied in the processing of textile materials, equipment configuration for processing textile materials, textiles and papermaking, etc., can solve the problems of high processing costs and production costs, waste of alkali resources, alkali loss, etc., to reduce tap water The use, huge benefits, and significant emission reduction effects

Active Publication Date: 2014-02-05
JIANGSU TAIFENG CHEM
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Problems solved by technology

According to tracking statistics and analysis, during the post-treatment and washing process of indigo, the filter cake washing causes a large amount of alkali loss, and a large amount of tap water is required to dilute and wash the material. After the lost alkali ente...

Method used

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  • Method for recycling mixed alkali liquor from after-treatment washing process of indigo

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with drawings and embodiments.

[0016] figure 1 As shown, a method for recovering mixed lye from the indigo post-treatment washing process, the flow process is: after the indigo oxidation process, it is sent to a filter press for pressure filtration, washed with tap water, and the filter press filtrate is concentrated through an alkali evaporation system and CO 2 After removing sodium to adjust the potassium-sodium ratio and dehydration, it is used as a solvent for alkali fusion in the oxidation process; the concentration of the washing liquid is 0.5%-5.0%, and the preferred concentration is 1.0%-4.0%. The washing liquid is sequentially desuspended, filtered and adsorbed organic matter After filtration, it is divided into two routes, one is returned to the filter press as washing water, and the other is cooled to 0-70°C, preferably 5-45°C, and returned to the indigo oxidation process for dilution of a...

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Abstract

The invention relates to a method for recycling mixed alkali liquor from an after-treatment washing process of indigo. According to the method for recycling the mixed alkali liquor from the after-treatment washing process of the indigo, after an indigo oxidation process, mixed alkali liquor is sent to a filter press for filter pressing, tap water is filled for washing, washing liquid is divided into two paths, one path returns back to the filter press to serve as washing water, and the other path returns back to the indigo oxidation process to serve as diluting water of alkali fusion materials according to the amount of the diluting water of the alkali fusion materials of the indigo oxidation process after being cooled. According to the method for recycling the mixed alkali liquor from the after-treatment washing process of the indigo, the requirements of the indigo oxidation process are combined, the characteristics of a alkali fusion process are utilized, a method of recycling and reusing is utilized, the filter-pressed washed low-concentration mixed alkali liquor is collected and reused as washing water and the diluting water of the kali fusion materials, full recycling of the low-concentration mixed alkali liquor and the utilization of surplus low-concentration mixed alkali liquor can be achieved, and the aims of emission reduction and fresh water tap water consumption reduction can be achieved.

Description

technical field [0001] The invention belongs to the recycling technology of dye chemical raw materials, in particular to a method for recycling mixed lye in the post-treatment washing process of vat dyes such as indigo. Background technique [0002] Indigo is an environmentally friendly vat dye with a long history, which is widely used in the dyeing of cotton fabrics, especially the warp yarns of indigo denim products. [0003] The current industrial production is to prepare indigo through the oxidation of 3-indoxyl salt. The reaction process includes a certain amount of aniline acetate, sodium amide, and a mixed alkali of sodium hydroxide and potassium hydroxide at 220~250°C. Reaction to obtain 20-30% alkali melt of 3-indoxyl salt, dissolve the alkali melt in a large amount of water, oxidize with air, press filter, wash and dry to obtain indigo. [0004] In the alkali fusion, oxidation and post-treatment process of indigo synthesis, the use of alkali is mainly in the alkal...

Claims

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Application Information

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IPC IPC(8): D06B23/00D06B23/20
Inventor 吴德生李留德毛永生常青
Owner JIANGSU TAIFENG CHEM
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