Method for carrying out coupling and extraction separation treatment on waste sulfuric acid by reaction between urea and sulfuric acid

A technology of waste sulfuric acid and urea, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of urea derivatives, etc., can solve the problems of difficult treatment and utilization of waste sulfuric acid, and achieve harmless treatment and resource utilization, Simple operation and mild reaction conditions

Inactive Publication Date: 2017-08-25
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for treating waste sulfuric acid containing organic impurities. In the process of reacting urea and sulfuric acid, the extraction and

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Take 69.28g of toluene and 68.71g of 36.99% waste sulfuric acid in a 250ml three-necked flask, preheat to 45°C, add 31.1329g of urea in a molar ratio of 2:1 to react, the reaction time is 2.5h, finally two phases are formed, and the extraction phase is passed through Recover the extractant by distillation under reduced pressure. 97.35 g of urea sulfuric acid solution can be obtained, and the removal rate of organic impurities is 88.85%.

Embodiment 2

[0017] Take 79.59g of carbon tetrachloride and 34.01g of 73.55% waste sulfuric acid in a 250ml three-necked flask, preheat to 30°C, add 7.7859g of urea in a molar ratio of 0.5:1 to react, the reaction time is 0.5h, and finally form two phases, The extraction phase was distilled under reduced pressure to recover the extractant. 41.05 g of urea sulfate solution can be obtained, and the removal rate of organic impurities is 89.01%.

Embodiment 3

[0019] Take 90.12g of chloroform and 34.01g of 73.55% waste sulfuric acid in a 250ml three-necked flask, preheat to 40°C, add 38.9184g of urea in a molar ratio of 2.5:1 to react, the reaction time is 1.5h, finally form two phases, extract The extractant was recovered by distillation under reduced pressure. 68.96g of urea sulfate solution can be obtained, and the removal rate of organic impurities is 92.47%.

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Abstract

The invention discloses a method for carrying out coupling and extraction separation treatment on waste sulfuric acid by reaction between urea and sulfuric acid. In a technological process of the invention, reaction between urea and waste sulfuric acid is carried out to produce urea sulfate as an additive of a composite fertilizer; meanwhile, in an extraction separation process of a coupling solvent, organic impurities contained in the waste sulfuric acid are subjected to extraction separation, and the extracted solvent is distilled and recycled for repeated utilization. The invention provides a method for treating organic waste sulfuric acid with mild condition. Organic impurities in the waste sulfuric acid can be effectively separated, and sulfuric acid components in the waste sulfuric acid can be converted into a urea sulfate product. Compared with an existing industrial treatment method of the waste sulfuric acid, the method disclosed by the invention has the advantages of lower energy consumption, simplicity in operation, mild conditions and the like.

Description

technical field [0001] The invention relates to a method for treating waste sulfuric acid by coupling, extracting, and separating urea-sulfuric acid reaction, and belongs to the field of harmless treatment and resource utilization of industrial waste. Background technique [0002] Sulfuric acid is an important raw material for chemical production and is widely used in industries such as alkylation, sulfonation, nitration, esterification, titanium dioxide, acetylene gas purification, and gas drying. However, 40%-50% of sulfuric acid in industrial production is not converted into products, but is converted into waste sulfuric acid containing impurities in the production process. According to statistics, the annual production of waste sulfuric acid in my country is as high as 100 million tons, of which inorganic waste sulfuric acid accounts for 35%, and organic waste sulfuric acid accounts for 65% (46% with a content above 40%). Organic waste sulfuric acid is waste sulfuric aci...

Claims

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Application Information

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IPC IPC(8): C07C273/02C07C275/02
CPCC07C273/02C07C275/02
Inventor 张涛唐盛伟罗俊国李娟
Owner SICHUAN UNIV
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