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A kind of production method of methyl carbamate

A technology of methyl carbamate and its production method, which is applied in the production field of methyl carbamate, can solve problems such as potential safety hazards, blockage of reactor pipelines, etc., and achieve the effects of smooth production reaction, increased yield, and perfect industrial conditions

Active Publication Date: 2021-08-24
重庆化工职业学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although its yield is high, it is easy to block the pipeline of the reactor, which is not conducive to further amplification, and more importantly, it will cause certain safety hazards

Method used

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  • A kind of production method of methyl carbamate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Equipment used in the production of methyl carbamate, such as figure 1 As shown, the equipment includes a reactor 1, the reactor 1 is provided with an agitator 2 and a temperature measuring thermocouple 7, the agitator 2 and the temperature measuring thermocouple 7 are connected to a controller 8, and the reactor 1 is connected to an inert gas storage cylinder 3 , the reactor 1 is provided with an exhaust channel 4 (exhaust pipe), the exhaust channel 4 is pressure-resistant 10Mpa, and the exhaust channel 4 is provided with five sections of independent outer pipes 5 ( figure 1 From bottom to top, there are outer tube 51, outer tube 52, outer tube 53, outer tube 54, outer tube 55), the outer tube 5 can be a metal tube, and an inlet and an outlet are respectively arranged on each section of the outer tube. The outlet and outlet can be used to connect the circulation pipeline, and the valves 6 for releasing gas are respectively arranged on the exhaust channels 4 located bel...

Embodiment 2

[0023] A production method of methyl carbamate, adopting the equipment in embodiment 1 to produce, wherein, the length of outer tube 51 is 0.2m, the length of outer tube 52 is 0.15m, the length of outer tube 53 is 0.1m, and the length of outer tube 54 is 0.05m, and the length of the outer pipe 55 is 0.01m.

[0024] The steps to produce methyl carbamate include:

[0025] Step 1: First introduce 6000mL of methanol, 426g of urea and 21g of catalyst into the reaction kettle in sequence, close the valve on the exhaust channel for releasing gas, and then flush 1.2MPa inert gas into the reaction system; the inert gas is nitrogen , the catalyst is titanium dioxide supported by silica, and the content of titanium dioxide is 2.9%;

[0026] Step 2: Control the temperature of the exhaust passage by dividing it into five sections. The pipe section of the exhaust passage where the outer pipe 51 is located uses tap water for temperature control, that is, tap water at 10°C is passed into the...

Embodiment 3

[0029] A production method of methyl carbamate, adopting the equipment in embodiment 1 to produce, wherein, the length of outer tube 51 is 0.3m, the length of outer tube 52 is 0.2m, the length of outer tube 53 is 0.15m, and the length of outer tube 54 is 0.1m, and the length of the outer pipe 55 is 0.05m.

[0030] The steps to produce methyl carbamate include:

[0031] Step 1: First introduce 6000mL of methanol, 426g of urea and 21g of catalyst into the reaction kettle in sequence, close the valve on the exhaust channel for releasing gas, and then flush 0.6MPa inert gas into the reaction system; the inert gas is nitrogen , the catalyst is titanium dioxide supported by silica, and the content of titanium dioxide is 2.9%;

[0032] Step 2: Control the temperature of the exhaust passage in 4 divided into five sections. The pipe section of the exhaust passage where the outer pipe 51 is located uses tap water for temperature control, that is, tap water at 4°C is passed into the out...

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Abstract

The invention provides a method for producing methyl carbamate, comprising: controlling the temperature of the exhaust channel of the reaction kettle in stages, controlling the temperature of the pipe section of the exhaust passage near the reaction kettle to 4-20°C, and gradually increasing the temperature of the subsequent pipe sections High, until the temperature of the exhaust channel pipe section away from the reactor is controlled at 75-85°C; the reaction process for the production of methyl carbamate by urea alcoholysis is pressurized to release gas, and the pressure of the reaction system in the reactor is maintained at 1.8-2.8Mpa . The invention solves the technical problem of blockage of the exhaust channel of the reaction kettle, improves the industrial conditions for the production of methyl carbamate, makes the production reaction more smooth, and can also increase the yield of the methyl carbamate.

Description

technical field [0001] The present invention relates to a kind of production method of methyl carbamate. Background technique [0002] Methyl carbamate, alias urethane, methyl urethane, structural formula: NH2C=OOCH3, molecular formula: C2H5NO2, molecular weight: 75.06, appearance: white crystal, melting point 54-58 ° C, boiling point 176-177 ° C, flash point 93°C, water solubility 700g / l, density 1.1361, refractive index 1.4125. Methyl carbamate has a wide range of uses and can be used as an intermediate in pesticides, medicine, synthetic resin modification and organic synthesis, etc. As an intermediate in organic synthesis, it can be used to synthesize isocyanate, non-toxic polyurethane, melamine derivatives, and polyvinylamine, etc., and carbamate can react with unsaturated hydrocarbons, aldehydes, ketones, polyols, and aromatic rings to produce polyphenols for various purposes. Derivatives; can also be used to synthesize compounds such as heterocyclic pyrrole, triazolo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C269/00C07C271/12
CPCC07C269/00C07C271/12
Inventor 马昱博揭芳芳李小庆宋春雨狄宁廖明佳罗力僮
Owner 重庆化工职业学院
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