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Application method of methylamino formyl chloride decomposition tail gas hydrogen chloride in cartap synthesis

A technology of methylcarbamoyl chloride and an application method, which is applied in the synthesis of saquat, in the field of methylcarbamoyl chloride decomposing tail gas hydrogen chloride, can solve the problems of high energy consumption, high by-produced hydrochloric acid, large equipment investment, etc. The effect of less hydrochloric acid production, less equipment investment, and fewer preparation steps

Active Publication Date: 2014-06-11
HUNAN GOFAR FINE CHEM IND TECH CO LDT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment process has the disadvantages of large equipment investment, high energy consumption, and many by-products of hydrochloric acid.

Method used

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  • Application method of methylamino formyl chloride decomposition tail gas hydrogen chloride in cartap synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Collect the mixed tail gas containing hydrogen chloride, chloroform and methyl isocyanate generated by the decomposition of carbamoyl chloride into the tail gas collection tank, and then condense through the condenser, and the condensed chloroform and methyl isocyanate condensate is transferred to methylamino The formyl chloride mixing tank enters the methyl isocyanate production system for recycling; the hydrogen chloride gas that has not been condensed is used to prepare cartap after being stabilized in the secondary buffer tank.

[0019] Add 346.0Kg of dichloroethane solution with a mass fraction of thiocyanide of 25%, 1000Kg of water, and 2.5Kg of benzyltrioctylammonium chloride into the catalytic hydrolysis kettle in sequence. Then turn on the stirring speed at 45-50r / min, pass through the separated carbamoyl chloride to decompose the tail gas hydrogen chloride, at this time the tail gas pressure is 0.04 MPa, and the flow rate is 20m 3 / h, the exhaust time is...

Embodiment 2

[0021] Collect the mixed tail gas containing hydrogen chloride, chloroform and methyl isocyanate generated by the decomposition of carbamoyl chloride into the tail gas collection tank, and then condense through the condenser, and the condensed chloroform and methyl isocyanate condensate is transferred to methylamino The formyl chloride mixing tank enters the methyl isocyanate production system for recycling; the hydrogen chloride gas that has not been condensed is used to prepare cartap after being stabilized in the secondary buffer tank.

[0022] Add 346.0Kg of dichloroethane solution with a mass fraction of thiocyanide of 25%, 1000Kg of water, and 2.5Kg of benzyltrioctylammonium chloride into the catalytic hydrolysis kettle in sequence. Then turn on the stirring speed at 45-50r / min, pass through the separated carbamoyl chloride to decompose the tail gas hydrogen chloride, at this time the tail gas pressure is 0.04 MPa, and the flow rate is 20m 3 / h, the exhaust time is...

Embodiment 3

[0024] Collect the mixed tail gas containing hydrogen chloride, chloroform and methyl isocyanate generated by the decomposition of carbamoyl chloride into the tail gas collection tank, and then condense through the condenser, and the condensed chloroform and methyl isocyanate condensate is transferred to methylamino The formyl chloride mixing tank enters the methyl isocyanate production system for recycling; the hydrogen chloride gas that has not been condensed is used to prepare cartap after being stabilized in the secondary buffer tank.

[0025] Add 346.0Kg of dichloroethane solution with a mass fraction of thiocyanide of 25%, 1000Kg of water, and 2.5Kg of benzyltrioctylammonium chloride into the catalytic hydrolysis kettle in sequence. Then turn on the stirring speed at 45-50r / min, pass through the separated carbamoyl chloride to decompose the tail gas hydrogen chloride, at this time the tail gas pressure is 0.03 MPa, and the flow rate is 20m 3 / h, the exhaust gas tim...

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Abstract

The invention relates to an application method of a methylamino formyl chloride decomposition tail gas hydrogen chloride in cartap synthesis. After a tail gas mixture of hydrogen chloride, trichloromethane and methyl isocyanate produced by decomposing methylamino formyl chloride is condensed by a condenser, the condensed condensate is transferred into a methylamino formyl chloride mixing slot, and then enters a circulating system of methyl isocyanate production for being collected and recycled; uncondensed gas hydrogen chloride is directly added into thiocyanide liquor of cartap synthesis after pressure is stabilized by a secondary buffer tank, so that the cartap is synthesized by catalytic hydrolysis. According to the invention, tertiary step cooling and condensing is adopted to separate a hydrogen chloride gas in the tail gas from a trichloromethane gas and a methyl isocyanate gas. The whole separating and recycling process is less in equipment investment and less in amount of byproduct hydrochloric acid; moreover, the separated hydrogen chloride gas is used for a catalytic hydrolysis process of the cartap.

Description

technical field [0001] The invention belongs to the field of organic chemistry, and specifically relates to a method for applying methylcarbamoyl chloride decomposition tail gas hydrogen chloride in the synthesis of cartap. This method can separate hydrogen chloride gas, chloroform gas and methyl isocyanate gas in the carbamoyl chloride decomposition tail gas, and the separated hydrogen chloride gas is directly passed into the thiocyanide solution in the synthesis of cartap for catalytic hydrolysis to prepare Chlorella. Background technique [0002] Nereist poison derivatives are a class of high-efficiency, low-toxicity, broad-spectrum biomimetic insecticides. The development of nereist poison biomimetic insecticides began in the 1970s in China, and the industrialized production and popularization of insecticides mainly include insecticides. Shuang, monosultap, cartap three varieties. [0003] At present, the synthesis method of cartap in China is to use monosultap as the ...

Claims

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Application Information

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IPC IPC(8): C07C333/04C07C265/04C07C263/20
Inventor 胡晓珊黎辉良张敦河陈朝辉李国栋祝红福文万志陈南方李勇利
Owner HUNAN GOFAR FINE CHEM IND TECH CO LDT
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