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The production method of methyl carbamate

A technology of methyl carbamate and a production method, which is applied in the production field of methyl carbamate, can solve the problems of complex manufacturing process of methyl carbamate, high waste rate of raw materials, low product yield, etc., shorten the reaction time, reduce the Raw material and energy consumption, and the effect of simplifying the synthesis system

Inactive Publication Date: 2011-12-14
ANHUI GUANGXIN AGROCHEM
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Problems solved by technology

At present, the manufacturing process of methyl carbamate in China is complicated, the waste rate of raw materials is high, the product yield is low, the environmental pollution is serious, and the competitiveness is poor compared with similar foreign products, which cannot meet the market demand for high-quality and low-priced products.

Method used

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Embodiment Construction

[0012] For domestic present methyl carbamate manufacturing process is complicated, raw material waste rate is high, product yield is low, the problem of serious environmental pollution, the present invention simplifies the synthetic system of methyl carbamate, and synthetic steps are:

[0013] Put trifluoromethoxyaniline and potassium carbonate solution into the reaction kettle, use toluene as solvent, add methyl chloroformate dropwise at 5-10°C, and react to generate KB687. Add potassium carbonate solution to KB687, after washing and water separation, transfer the organic phase to the concentration kettle and concentrate under pressure.

[0014] In addition, sodium methoxide solution and toluene are put into the reaction kettle, and the concentrated solution of KB687 is added dropwise under the reaction environment of -0.09MPa and 30-50°C, and the reaction generates KB687Na salt.

[0015] Put xylene into the synthesis kettle, pass through phosgene at 0°C, and add KB687Na salt...

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Abstract

The invention provides a method for producing methyl carbamate, comprising the steps of synthesis of KB687, post-synthesis treatment of KB687, synthesis of KB687Na salt, synthesis of methyl carbamate solution, and post-synthesis treatment of methyl carbamate solution. The process of the invention simplifies the synthetic system of methyl carbamate, improves the yield of methyl carbamate, simplifies the operation procedure and shortens the reaction time. The material balance and energy exchange balance of the entire technological process, through the control of reaction conditions, achieve high selectivity of products, achieve reasonable comprehensive utilization, reduce raw material and energy consumption, and greatly save production costs.

Description

technical field [0001] The invention relates to a preparation method in the field of chemical industry, in particular to a production method of methyl carbamate. Background technique [0002] Methyl carbamate belongs to a kind of chemical product, which is widely used in medicine, pesticide, rubber manufacturing and other industries. It has the characteristics of wide application range and good use effect. At present, the manufacturing process of methyl carbamate in China is complicated, the waste rate of raw materials is high, the product yield is low, the environmental pollution is serious, and the competitiveness is poor compared with similar foreign products, which cannot meet the market demand for high-quality and low-priced products. Contents of the invention [0003] Aiming at the above problems in the prior art, the present invention provides a method for producing methyl carbamate with simple process, high utilization rate of raw materials and little environmental...

Claims

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Application Information

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IPC IPC(8): C07C271/12C07C269/06
Inventor 黄金祥过学军许健杨小明胡安胜吴建平高焰兵魏健
Owner ANHUI GUANGXIN AGROCHEM
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