Novel comprehensive utilization technique of industrial waste sulfuric acid

A waste sulfuric acid and sulfuric acid technology, applied in the preparation of ammonium sulfate, organic compounds, organic chemistry, etc., can solve the problems of narrow use range, difficult recovery of organic matter, high energy consumption, and achieve improved quality, good economic and environmental benefits , the effect of improving the utilization rate of raw materials

Inactive Publication Date: 2008-06-18
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the market demand for ordinary calcium is greatly affected by the season, the market demand for waste sulfuric acid also fluctuates with the season, and the price is also low
[0008] The method of direct concentration not only has high energy consumption, but also it is difficult to recycle the organic matter; the waste sulfuric acid after concentration contains more organic matter, which leads to its low price and narrow use range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Waste sulfuric acid is heated, kept warm, cooled, and suction filtered to recover p-aminobenzenesulfonic acid.

[0041] Take 200 grams of waste sulfuric acid in a three-necked flask, heat up to boiling, keep stirring at 100°C to 110°C for 3 hours, then cool to about 0°C while stirring, and separate by suction to obtain p-aminobenzenesulfonic acid. The p-aminobenzenesulfonic acid is separated by recrystallization and suction filtration, and the white powdery p-aminobenzenesulfonic acid is obtained after drying. After analysis and inspection, the yield of the reaction p-aminobenzenesulfonic acid is 90%, and the content of p-aminobenzenesulfonic acid in the product reaches 99%, meeting the requirements of relevant indicators in HG / T 3678-2000.

Embodiment 2

[0043] Add ammonium chloride to waste sulfuric acid after removing organic matter to produce hydrochloric acid.

[0044] Take 190 grams of 37% waste sulfuric acid and 43 grams of 95% ammonium chloride after removing organic matter at 0°C in a 250ml four-necked flask, stir and heat, and when the temperature at the bottom of the kettle rises to about 115°C, start The distillate was taken out, and the temperature of the distillate was 108°C. When the temperature at the bottom of the kettle rose to 150°C and the temperature of the gas phase dropped, the distillation was stopped. After analysis, the concentration of hydrochloric acid was 21%, and the yield of this reaction hydrochloric acid was 95%.

Embodiment 3

[0046] Add about 50% of waste sulfuric acid to ammonium chloride to distill hydrochloric acid.

[0047] Take 150 grams of waste sulfuric acid concentrated to about 50% after removing organic matter at 0°C and add 43 grams of 95% ammonium chloride in a 250ml four-neck flask, stir and heat, and absorb with 10 grams of 10% hydrochloric acid. When the temperature rises to about 70°C, a large amount of acid mist will precipitate. Continue heating and stirring to raise the temperature, and when the temperature of the kettle rises to the bottom and the temperature rises to 160°C, the distillation is stopped. After analysis, the concentration of hydrochloric acid was 34%, and the yield of this reaction hydrochloric acid was 98%.

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PUM

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Abstract

The invention relates to a method for recycling the waste sulfuric acid of the second separation during the production process of the industrial sulfanilamide. The invention method is the novel process of first recycling the organic matter and second treating the waste sulfuric acid, and hydrochloric acid and ammonium hydrogen sulfate or ammonium sulfate with wide application by the treatment of the waste sulfuric acid. The invention not only reduces the environmental pollution and but also decreases the production cost of the industrial sulfanilamide, and has the good environmental protection benefit, the social benefit and the enormous economic benefit.

Description

technical field [0001] The invention is a new process for the comprehensive utilization of industrial waste sulfuric acid and ammonium chloride, especially a new process for the resource utilization of dichotomized waste sulfuric acid produced in the production process of industrial sulfonamide. Background technique [0002] At present, in the production of industrial sulfonamides, there are high consumption of raw materials, high energy consumption, and serious problems of "three wastes". Before a new process that can reduce costs and reduce pollution is developed, seeking resource utilization of "three wastes" is to reduce energy consumption. , reduce costs, and solve environmental pollution in an effective way. [0003] In the production process of industrial sulfonamides, use antipyretic ice (acetanilide) to obtain acetaminobenzenesulfonyl chloride and water through sulfonation of chlorosulfonic acid at a certain temperature, and simultaneously by-product paracetamol and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C309/47C07C303/44C01C1/24
Inventor 谢增勇崔建斌尹应武张众笑刘平查正炯袁可
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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