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Production process for preparing dimethyl sulfate by composite acid through catalytic dehydration

A dimethyl sulfate, catalytic dehydration technology, applied in the direction of sulfuric acid ester preparation, organic chemistry, etc., can solve the problems of high consumption of methanol and sulfuric acid, the output does not reach the efficiency level, serious production pollution, etc., to reduce the unit consumption of methanol, Increase market competitiveness and protect the environment

Inactive Publication Date: 2010-02-24
HUBEI YUANDA FUCHI PHARMA CHEM
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Problems solved by technology

[0006] During the production process of this process, the consumption of methanol and sulfuric acid is high, the output has not reached the proper level of efficiency, and the production pollution is also serious

Method used

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  • Production process for preparing dimethyl sulfate by composite acid through catalytic dehydration
  • Production process for preparing dimethyl sulfate by composite acid through catalytic dehydration

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Embodiment Construction

[0012] The implementation of the present invention is to use a pump to press sulfuric acid and phosphoric acid to the high-level tank, prepare a qualified compound acid according to a certain ratio, put it into the etherification reaction kettle, and then vaporize the metered methanol and pass it into the etherification reaction kettle , dehydration reaction under certain conditions to generate dimethyl ether gas, after three-stage purification, it is sent to the esterification tower, and at a certain temperature, it reacts with dimethyl sulfate rich liquid that has absorbed sulfur trioxide to generate dimethyl sulfate Crude product, the qualified dimethyl sulfate crude product is delivered to refining station and carries out vacuum distillation and obtains qualified dimethyl sulfate finished product.

[0013] (1) Methanol catalytic dehydration

[0014]

[0015] Methanol gas enters the tank from the bottom of the etherification reaction tank and fully bubbles into contact w...

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Abstract

The invention relates to a production process for preparing dimethyl sulfate by composite acid through catalytic dehydration, which solves the problems of high consumption of sulphuric acid and methanol during production and more serious production pollution in the prior domestic production of dimethyl sulfate due to the adoption of conventional sulphuric acid-methanol method. The production process is characterized in that composite acid catalyst is adopted to carry out dehydrated etherealization of vaporized methanol to generate dimethyl ether gas; after purification, dimethyl ether gas reacts with dimethyl sulfate rich solution absorbing sulfur trioxide to generate a crude product of dimethyl sulfate; and an eligible finished product of dimethyl sulfate is obtained through reduced pressure distillation. The production process is suitable to be used in small and medium-sized methanol production enterprises or sulphuric acid production enterprises taking dimethyl sulfate as a downstream product.

Description

1. Technical field [0001] The invention belongs to a production method of dimethyl sulfate, in particular to a production process for preparing organic chemical raw material dimethyl sulfate by catalytic dehydration of sulfuric acid and phosphoric acid mixture. 2. Background technology [0002] Dimethyl sulfate is an important chemical raw material, a good methylating agent in organic synthesis, and widely used in industries such as chemical industry, medicine, pesticide, military industry, dyestuff, fragrance, rubber and leather. At present, the production of dimethyl sulfate in China adopts traditional production techniques and catalysts, that is, direct use of sulfuric acid etherification, and its production process is roughly as follows: [0003] 1. With catalyst: sulfuric acid + methanol → methyl hydrogen sulfate [0004] 2. Etherification: methyl hydrogen sulfate + methanol → dimethyl ether [0005] 3. Esterification: dimethyl ether + sulfur trioxide → dimethyl sulfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C305/08C07C303/24
Inventor 肖满庚熊先胜
Owner HUBEI YUANDA FUCHI PHARMA CHEM
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