Comprehensive utilization method of sodium hydrosulfite waste residue

A technology of hydrosulfite and waste residue, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of failure to comprehensively utilize organic substances and reduce the amount of waste residue
CN103694101AActive Publication Date: 2014-04-02SHENZHEN GANGCHUANG BUILDING MATERIAL
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHENZHEN GANGCHUANG BUILDING MATERIAL
Publication Date
2014-04-02

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Abstract

The present invention discloses a comprehensive utilization method of sodium hydrosulfite waste residue. The comprehensive utilization method comprises that: (1) a vacuum distillation method is adopted to remove water in sodium hydrosulfite waste residue and concurrently obtain ethylene glycol; (2) the remaining waste residue obtained from vacuum distillation is washed by using an organic solvent to obtain an organic phase I and a solid A; (3) according to different solubilities of the solid in the solvent, sodium isethionate and sodium formate can be obtained; and (4) the organic phase I is subjected to vacuum distillation to recover the solvent and concurrently obtain thiodiglycol. According to the invention, the waste residue produced in the sodium hydrosulfite production process is subjected to comprehensive utilization and is purified to obtain four organic products, such that enterprise waste emission is reduced while economic benefits and social benefits are brought to enterprises.
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Description

technical field

[0001] The invention relates to a comprehensive utilization technology of waste residue produced in the production of sodium hydrosulfite. High-value products such as ethylene glycol, sodium isethionate and thiodiglycol can also be obtained while recovering sodium formate from waste residue through this technology. Background technique

[0002] At present, the main method of domestic production of hydrosulfite is the sodium formate method. The quality of hydrosulfite produced by this method is stable, the manufacturing cost is low, and the production capacity is high. The hydrosulfite produced by this method accounts for 90% of the total national output. The waste residue discharged from the hydrosulfite produced by the method mainly contains organic matter such as sodium formate, ethylene glycol, sodium isethionate, thiodiglycol and a small amount of water. At present, there is no effective treatment and utilization method, and most companies store it temp...

Claims

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