Production method and equipment of methyl isocyanate

A technology of methyl isocyanate and production method, applied in the field of methyl isocyanate, can solve the problems of large pollutant discharge, low chemical synthesis reaction yield and the like

Inactive Publication Date: 2014-04-02
荆州沙隆达控股有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the formation of various slags in the production process, the yield of c

Method used

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  • Production method and equipment of methyl isocyanate

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Experimental program
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Effect test

Embodiment 1

[0023] The production method of methyl isocyanate of the present invention, it comprises the steps:

[0024] (1) with CO 2 , O 2 and coke to produce CO, then CO and chlorine to produce phosgene, and then phosgene and monomethylamine to synthesize methylcarbamoyl chloride; the mass ratio of phosgene and monomethylamine is 3:1; the synthesis reaction of phosgene and monomethylamine The temperature is 250°C.

[0025] (2) After methylcarbamoyl chloride is synthesized, send it to the mixing tank and add solvent for mixing. There is a small amount of methylammonium hydrochloride solid residue in the mixture of acid chloride and solvent, and it is filtered by adding wire mesh filler and 350 mesh filter cloth in two stages The filter is continuously filtered to remove slag and sent to the decomposer; in step (2), the solvent that dissolves methyl isocyanate and enters the slag removal and purification production system is chloroform.

[0026] (3) The mixture of acid chloride and so...

Embodiment 2

[0032] The production method of methyl isocyanate of the present invention, step is the same as embodiment one, difference is: step (1) uses CO 2 , O 2and coke to produce CO, then CO and chlorine to produce phosgene, and then phosgene and monomethylamine to synthesize methylcarbamoyl chloride; the mass ratio of phosgene and monomethylamine is 3.3:1; the synthesis reaction of phosgene and monomethylamine The temperature is 260°C. Step (3) Control the temperature in the decomposer to 140°C; the temperature of the decomposer is controlled from 150 to 180°C to 140°C, which can reduce the production of methyl isocyanate polymers and increase the yield of methyl isocyanate by 93%. A gas-liquid separator is used to guide the high-boiling point substances in the decomposition reaction system to the slag steaming kettle, and the liquid material containing solid slag generated in the material circulation is directed into the slag steaming kettle. When 2000L is collected, the steam is t...

Embodiment 3

[0034] The production method of methyl isocyanate of the present invention, step is the same as embodiment one, difference is: the production method of methyl isocyanate of the present invention, step is the same as embodiment one, difference is: step (1) uses CO 2 , O 2 and coke to produce CO, then CO and chlorine to produce phosgene, and then phosgene and monomethylamine to synthesize methylcarbamoyl chloride; the mass ratio of phosgene and monomethylamine is 3.5:1; the synthesis reaction of phosgene and monomethylamine The temperature was 255°C. Step (3) Control the temperature in the decomposer to 130°C, and control the temperature of the decomposer from 150 to 180°C to 1,30°C, which can reduce the production of methyl isocyanate polymers and increase the yield of methyl isocyanate by 95%. A gas-liquid separator is used to guide the high-boiling point substances in the decomposition reaction system to the slag steaming kettle, and the liquid material containing solid slag...

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Abstract

The invention discloses a production method of methyl isocyanate. The method comprises the following steps: producing CO from CO2, O2 and coke, producing phosgene from CO and chlorine gas, synthesizing methylaminoformyl chloride from the phosgene and the monomethylamine, decomposing and purifying to prepare the methyl isocyanate. The invention further discloses production equipment of methyl isocyanate. According to the production method and equipment, the energy consumption can be effectively reduced, byproducts are reduced, the production cost is lowered, the product yield is increased, the labor intensity of workers is reduced, the production field environment is improved, the reaction safety is further enhanced, and the three-waste emission is reduced.

Description

technical field [0001] The invention relates to the technical field of methyl isocyanate, in particular to a method and equipment for producing methyl isocyanate. Background technique [0002] Methyl isocyanate is an intermediate of carbamate pesticides. In China, methyl isocyanate is produced by reacting phosgene with monomethylamine at a temperature of 250-260°C to directly synthesize the target product. Currently, a continuous method is generally used for production. Due to the formation of various slags during the production process, the yield of the chemical synthesis reaction is not high and the discharge of pollutants is large. Contents of the invention [0003] In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a production method and equipment for methyl isocyanate, which can reduce energy consumption, increase yield, increase product yield, reduce discharge of three wastes, increase output per unit time, an...

Claims

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Application Information

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IPC IPC(8): C07D265/04C07D263/04C07D263/20
CPCC07C263/04C07C263/20C07C265/04
Inventor 李子平黄刚
Owner 荆州沙隆达控股有限公司
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