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Method for producing methyl carbamate

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

Active Publication Date: 2019-12-20
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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  • Method for producing methyl carbamate

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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. The method comprises the following steps: performing sectional temperature control on an exhaust channel of a reaction kettle, controlling the temperature of a pipeline section of the exhaust channel close to the reaction kettle to 4-20 DEG C, and increasing the temperatures of later pipeline sections gradually till the temperature ofa pipeline section of the exhaust channel far away from the reaction kettle is 75-85 DEG C; and performing pressurization on a reaction process for preparing methyl carbamate by using a urea alcoholysis method to release a gas, and maintaining the pressure of the reaction system in the reaction kettle to 1.8-2.8MPa. By adopting the method, the technical problem that the exhaust channel of the reaction kettle is blocked can be solved, industrial conditions of production of methyl carbamate can be completed, production reactions can be performed smoothly, and in addition, the yield of the methyl carbamate can be increased.

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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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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