Process for producing methyl carbamate

A technology of methyl carbamate and process, which is applied in the field of producing methyl carbamate, can solve the problems of high equipment material requirements, high equipment requirements, complicated process flow, etc., and achieve shortened reaction time, energy exchange balance, and material balanced effect

Inactive Publication Date: 2005-10-19
山东康瑞集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing production process of MC synthesis at home and abroad mainly adopts the phosgene route. Since the raw materials and solvents used in production are toxic, the process is complicated, the requirements for equipment are high, the investment is huge, and the production cost is high.
The existing urea alcoholysis production process involves the separation and treatment of various catalysts, which also complicates the process. At the same time, because the catalyst used is corrosive to the equipment, the equipment material requirements are high, resulting in equipment investment. bigger

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Add urea and methanol into the reaction kettle according to the proportional metering relationship, heat the reaction temperature to 140°C, and when the pressure reaches 1.5Mpa, open the valve connecting the gas phase of the reaction kettle and the rectification tower, and the rectification tower starts to work. 3 The urea-methanol solution with a concentration of 1mol / L is supplemented at a rate of 1 mol / L, and the gas phase release rate from the reactor to the rectification tower is controlled to maintain the balance of the materials in and out of the reactor, and the reaction time is 4 hours. The methyl carbamate yield was 86%. Simultaneously by-product 30% ammonia water.

Embodiment 2

[0011] Example 2: Add urea and methanol into the reactor according to the proportional metering relationship, heat the reaction temperature to 150°C, and when the pressure reaches 1.0Mpa, open the valve connecting the gas phase of the reactor and the rectification tower, and the rectification tower starts to work. 3 The urea-methanol solution with a concentration of 0.5mol / L is supplemented at a rate of 0.5 mol / L to control the gas-phase release rate from the reactor to the rectification tower, so as to maintain the balance of the materials in and out of the reactor, and the reaction time is 3 hours. The methyl carbamate yield was 90%. Simultaneously by-product 30% ammonia water.

Embodiment 3

[0013] Add urea and methanol into the reaction kettle in proportion to the metering relationship, heat the reaction temperature to 150°C, and when the pressure reaches 1.5Mpa, open the valve connecting the gas phase of the reaction kettle and the rectification tower, and the rectification tower starts to work, with 0.2m 3 The urea-methanol solution with a concentration of 1.5 mol / L is supplemented at a rate of 1.5 mol / L, and the gas phase release rate from the reactor to the rectification tower is controlled to maintain the balance of the materials in and out of the reactor, and the reaction time is 4 hours. The methyl carbamate yield was 88%. Simultaneously by-product 30% ammonia water.

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Abstract

The methyl carbamate producing process belongs to the field of fine chemical technology. The technological scheme of purifying methyl carbamate includes: dissolving urea in methanol to obtain methanol solution of urea of 0.01-10 mol/L concentration, reaction in reactor at 100-180 deg.c and 0.1-1.5 MPa for 0.5-10 hr, condensing in condensator to separate ammonia and making ammonia produce ammonia water, returning methanol with ammonia separated to the reaction system, and product purification. The present invention has high methyl carbamate yield, simplified operation, short reaction period, low power consumption and low cost.

Description

1. Technical field [0001] The invention belongs to a process flow for producing methyl carbamate, and belongs to the field of fine chemical production process. 2. Background technology [0002] Methyl carbamate (Met hr yl Carbamate, referred to as MC), alias urethane (Ureat hr ylane), methyl urethane (Met hr yluret hr ane), is an important organic synthesis intermediate. It is mainly used in the synthesis of medicines and pesticides. Its derivatives are used as herbicides, insecticides, rubber antioxidants, heat stabilizers, etc., and are more and more widely used in agriculture and rubber industries. Compared with other types of pesticides, carbamate pesticides have the characteristics of low toxicity to humans and other mammals, strong specificity in poisoning, easy to be degraded by various factors, low residues, and small side effects on the environment. Therefore, in recent years, it has become a new type of insecticide, herbicide, mosquito killer and fly agent that ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C269/00C07C271/12
Inventor 张兆文袁存光于剑峰唐仕明袁建国张延路
Owner 山东康瑞集团有限公司
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