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

Active Publication Date: 2014-04-02
SHENZHEN GANGCHUANG BUILDING MATERIAL
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Problems solved by technology

Gao Hong (Journal of Hefei University, 2006, 16(3), 25) researched a clean production process of hydrosulfite, which first used incineration to recover sodium thiosulfate for waste

Method used

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  • Comprehensive utilization method of sodium hydrosulfite waste residue

Examples

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Effect test

example 1

[0015] Example 1: Weigh 1000g of sodium hydrosulfite waste residue and put it into a vacuum still, turn on the vacuum pump, adjust the vacuum degree to about 2000Pa, control the heating temperature of the oil bath to about 80°C, complete the distillation of water in 3 hours, and obtain a water quality of 98g. Close the water receiving tank, open the ethylene glycol receiving tank, adjust the vacuum to 600Pa, raise the heating temperature to 100°C, and distill to obtain colorless ethylene glycol. The quality of the obtained ethylene glycol is 100g, and the purity is 99.5%.

[0016] Take 1500 ml of isopropanol: acetone mixed organic solvent with a volume ratio of 3:1 to wash the waste residue from the removal of water and ethylene glycol in the previous step. The number of washings is 4 times, and the washing temperature is 25-30°C. Filtration obtains solid A498g, accounts for 50% of waste residue total amount. The filtrates were combined to give the organic phase I.

[0017] T...

example 2

[0019] Example 2: Weigh 1000g of sodium hydrosulfite waste residue and put it into a vacuum still, turn on the vacuum pump, adjust the vacuum degree to about 2000Pa, control the heating temperature of the oil bath to about 100°C, and distill water in 1 hour to obtain a water quality of 97.5g. Close the water receiving tank, open the ethylene glycol receiving tank, adjust the vacuum to 600Pa, raise the heating temperature to 120°C, and distill to obtain colorless ethylene glycol. The quality of the obtained ethylene glycol is 101g, and the purity is 99%.

[0020] Take 1500 ml of isopropanol: acetone mixed organic solvent with a volume ratio of 2:1 to wash the waste residue removed from water and ethylene glycol in the previous step. The amount of mixed organic solvent used is 3 times the quality of the waste residue, and the number of washings is 3 times, the washing temperature is 25-30°C. Filtration afforded solid A 495g. The filtrates were combined to give the organic phase...

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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.

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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Application Information

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IPC IPC(8): C07C51/42C07C53/06C07C323/12C07C319/28C07C309/08C07C303/44C07C31/20C07C29/80
CPCC07C29/80C07C51/42C07C303/44C07C319/28C07C53/06C07C323/12C07C309/08C07C31/202
Inventor 孙国新刘思源孙国静
Owner SHENZHEN GANGCHUANG BUILDING MATERIAL
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