Device for producing methyl isocyanate from dimethyl sulfate and continuous process

A technology of methyl isocyanate and dimethyl sulfate, applied in the purification/separation of isocyanic acid derivatives, preparation of isocyanic acid derivatives, organic chemistry, etc., can solve problems affecting the safety of environmental workers and avoid side effects Responsive, reasonable overall design, simple operation process

Active Publication Date: 2020-07-28
河南金鹏化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Methyl isocyanate is a flammable and highly toxic liquid. At present, the synthesis of methyl isocyanate from dimethyl sulfate in China is a batch production process, which requires frequent manual opening of the reactor for feeding. During the process, highly toxic methyl isocyanate Etc. gases etc. are easily volatilized into the air, affecting the environment and worker safety; therefore, design a device and continuous chemical process is necessary

Method used

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  • Device for producing methyl isocyanate from dimethyl sulfate and continuous process
  • Device for producing methyl isocyanate from dimethyl sulfate and continuous process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] like figure 1 Shown, a kind of device that dimethyl sulfate produces methyl isocyanate, it comprises methyl isocyanate reactor D1, and described methyl isocyanate reactor D1 is connected with raw material solvent oil feed line 1, Sodium cyanate feed line 2 and dimethyl sulfate feed line 3, described methyl isocyanate reactor D1 is connected with methyl isocyanate condenser C1 by product discharge line 4 after reaction, described isocyanate Acetate methyl ester condenser C1 is connected with gas-liquid separation tank D2 through condensed mixture delivery line 5; Said gas-liquid separation tank D2 is connected with said methyl isocyanate reactor D1 through circulating solvent oil delivery line 6, said After the gas-liquid separation tank D2 is separated from the gas-liquid, the nitrogen delivery pipeline 7 is connected with a nitrogen compressor C2, and the nitrogen compressor C2 is connected with a nitrogen inlet pipeline 8, and the nitrogen compressor C2 is connected w...

Embodiment 2

[0032] like figure 1Shown, a kind of device that dimethyl sulfate produces methyl isocyanate, it comprises methyl isocyanate reactor D1, and described methyl isocyanate reactor D1 is connected with raw material solvent oil feed line 1, Sodium cyanate feed line 2 and dimethyl sulfate feed line 3, described methyl isocyanate reactor D1 is connected with methyl isocyanate condenser C1 by product discharge line 4 after reaction, described isocyanate Acetate methyl ester condenser C1 is connected with gas-liquid separation tank D2 through condensed mixture delivery line 5; Said gas-liquid separation tank D2 is connected with said methyl isocyanate reactor D1 through circulating solvent oil delivery line 6, said After the gas-liquid separation tank D2 is separated from the gas-liquid, the nitrogen delivery pipeline 7 is connected with a nitrogen compressor C2, and the nitrogen compressor C2 is connected with a nitrogen inlet pipeline 8, and the nitrogen compressor C2 is connected wi...

Embodiment 3

[0042] A kind of dimethyl sulfate is produced the continuous process of methyl isocyanate, it has used above-mentioned such as figure 1 A kind of dimethyl sulfate shown produces the device of methyl isocyanate, can adopt following steps:

[0043] 180# solvent oil enters described methyl isocyanate reactor D1 with 2000g / h, sodium cyanate through raw material solvent oil feed line 1 and sodium cyanate feed line 2 respectively with the speed of 267g / h, dimethyl sulfate Ester enters the methyl isocyanate reactor D1 through the dimethyl sulfate feed line 3 at a speed of 323g / h, and the reaction temperature is controlled at 180° C. through the jacket; nitrogen passes through the nitrogen compressor C2 to The speed of 6L / h enters the described methyl isocyanate reactor D1; the material that has reacted enters the described methyl isocyanate condenser C1 through the product discharge pipeline 4 after the reaction, and controls the methyl isocyanate The outlet temperature of the ester...

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PUM

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Abstract

The invention belongs to the technical field of fine chemical synthesis, and particularly relates to a device for producing methyl isocyanate from dimethyl sulfate and a continuous process. The devicecomprises a methyl isocyanate reactor, wherein the methyl isocyanate reactor is connected with a raw material solvent oil feeding pipeline, a sodium cyanate feeding pipeline and a dimethyl sulfate feeding pipeline, the methyl isocyanate reactor is connected with a methyl isocyanate condenser through a post-reaction product discharging pipeline, and is connected with a gas-liquid separation tank through a post-condensation mixture conveying pipeline, the gas-liquid separation tank is connected with a methyl isocyanate reactor through a circulating solvent oil conveying pipeline, a nitrogen compressor is connected with a nitrogen conveying pipeline after gas-liquid separation, and the nitrogen compressor is connected with the methyl isocyanate reactor through a compressed nitrogen conveyingpipeline, and the gas-liquid separation tank is connected with a methyl isocyanate discharging pump through a methyl isocyanate conveying pipeline after gas-liquid separation. According to the method, continuous production of methyl isocyanate can be realized by using dimethyl sulfate, the reaction rate is high, and the yield is high.

Description

technical field [0001] The invention belongs to the technical field of fine chemical synthesis, and in particular relates to a device and a continuous process for producing methyl isocyanate from dimethyl sulfate. Background technique [0002] Methyl isocyanate is one of the most important varieties of monoalkyl isocyanates, and has been widely used in many fields such as polymer industry, plastic industry, pharmaceutical industry, and pesticide industry. The monomer of urea and polymer binder; in the pesticide industry, it is the main source for the manufacture of carbamate insecticides such as carbaryl, aldicarb, carbofuran, and herbicides such as carbadan and oat enemy. Intermediate; methyl isocyanate There is a carbon atom in the molecule that is connected with two double bonds, which makes it have the characteristics similar to the enone structure, and has strong addition property, and can be combined with various compounds containing active hydrogen, such as phenol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C263/00C07C263/20C07C265/04
CPCC07C263/00C07C263/20C07C265/04
Inventor 周明杰谢省宾孙高杰张龙祥张龙龙王振
Owner 河南金鹏化工有限公司
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