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Reuse of Bunte salt in sodium hydrosulfite waste residue

A hydrosulfite and waste residue technology, which is applied in the preparation of sulfonates, organic chemistry, etc., can solve the problems of expensive investment, inability to recycle organic substances, and no conversion and utilization of high value-added products.

Inactive Publication Date: 2015-08-05
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN102050471A uses steps such as ultrafiltration, nanofiltration, concentrated crystallization, and centrifugal filtration to recover sodium formate and sodium sulfite. The investment in equipment is expensive, but organic matter with high added value cannot be recycled.
Patent CN101214930A discloses a method for co-producing sodium lignin sulfonate by using sodium hydrosulfite residue, and this method does not convert and utilize high value-added products in waste residue

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] (1) Weigh 100g of Bunter's salt into a round bottom flask, add 100g of water to dissolve, take 30mL of hydrochloric acid solution with a mass fraction of 10% and drop it into the flask while stirring, and control the acid hydrolysis temperature at 85-90°C, Reaction time 3h;

[0013] (2) Cool the solution after acid hydrolysis, control the temperature at 10-15°C, slowly add 80g of hydrogen peroxide dropwise, and control the reaction time to 3h after the dropwise addition;

[0014] (3) After the reaction, add sodium hydroxide into the reaction bottle for neutralization, and the quality of adding sodium hydroxide is 30g;

[0015] (4) Slowly add 100mL of ethanol to the neutralized solution, and a white flocculent precipitate will slowly wash out from the solution, which is sodium isethionate. The precipitate was suction filtered, washed, and dried. The weight m=64g, the yield was 78%, and the product purity was 98%.

Embodiment 2

[0017] (1) Weigh 100g of Bunter's salt into a round bottom flask, add 100g of water to dissolve, take 20mL of sulfuric acid solution with a mass fraction of 30% and drop it into the flask while stirring, and control the acid hydrolysis temperature at 85-90°C. Reaction time 3h;

[0018] (2) Cool the solution after acid hydrolysis, control the temperature at 10-15°C, slowly add 60g of hydrogen peroxide dropwise, and control the reaction time to 2.5h after the dropwise addition;

[0019] (3) After the reaction, add sodium hydroxide into the reaction bottle for neutralization, and the quality of adding sodium hydroxide is 30g;

[0020] (4) Slowly add 100mL of ethanol to the neutralized solution, and a white flocculent precipitate will slowly wash out from the solution, which is sodium isethionate. The precipitate was suction filtered, washed, and dried. The weight m=69g, the yield was 84%, and the product purity was 97%.

Embodiment 3

[0022] (1) Weigh 100g of Bunter's salt into a round bottom flask, add 100g of water to dissolve, take 20mL of nitric acid solution with a mass fraction of 20% and drop it into the flask while stirring, and control the acid hydrolysis temperature at 70-75°C. Reaction time 1.5h;

[0023] (2) Cool the solution after the acid hydrolysis, control the temperature at 10-15°C, slowly add 50g of hydrogen peroxide dropwise, and control the reaction time to 1.5h after the dropwise addition;

[0024] (3) After the reaction, add potassium hydroxide into the reaction flask for neutralization, and the quality of adding potassium hydroxide is 40g;

[0025] (4) Slowly add 200mL of ethanol to the neutralized solution, and a white flocculent precipitate will slowly wash out from the solution, which is sodium isethionate. Suction filter, wash and dry the precipitate, the weight m=72g, the yield is 87%, and the product purity is 97%.

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Abstract

The invention discloses a reuse method for Bunte salt in sodium hydrosulfite waste residue. The main processes include (1) acidolysis of Bunte salt, (2) oxidation of acidolysis product, (3) alkali neutralization, and (4) product precipitation. The method provided by the invention converts the waste Bunte salt in sodium hydrosulfite waste residue into high value-added sodium hydroxyethyl sulfonate, and turns waste into treasure, and the purity of the product can reach 95%. With the characteristics of mild reaction conditions and simple operation process, the method solves enterprise environmental pollution, and at the same time brings economic benefits and social benefits to enterprises.

Description

technical field [0001] The invention relates to a method for converting and reusing bundt salt in waste residue of sodium hydrosulfate. The bundt salt is converted into sodium isethionate with high economic value through conversion, which belongs to the nature of waste recycling. Background technique [0002] At present, there are mainly two methods for domestic production of hydrosulfite, sodium formate method and zinc powder method. Because the sodium formate method has the advantages of low production cost and stable quality, the output of sodium formate production accounts for 4 / 5 of the total national output of hydrosulfite. The waste liquid after the hydrosulfite is produced by the method contains a large amount of organic waste, which causes serious pollution to the environment. There is no unified standard for the utilization of sodium hydrosulfite waste residue in China, and the high processing costs make enterprises discouraged. [0003] Patent CN1164527A just co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/08C07C303/32
Inventor 孙国新牟晓磊崔玉
Owner UNIV OF JINAN
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