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Method for preparing methyl carhamate

A technology of methyl carbamate and methanol, applied in the chemical industry, can solve problems such as environmental pollution, high waste rate of raw materials, complicated manufacturing process of methyl carbamate, etc., and achieve the effect of speeding up the reaction rate and improving the yield

Inactive Publication Date: 2009-11-04
KENLI SANHE NEW MATERIAL TECH
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  • Abstract
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AI Technical Summary

Benefits of technology

This invention relies about making certain chemical compounds that can be used for various purposes like fertilizers or pesticides. By mixing these materials with specific substances called catalyst(s) -dimensionality enhancer), they make it faster than traditional methods while also increasing yields from other starting material sources such as ethyleneglycol.

Problems solved by technology

The technical problem addressed by this patented technology relates to improving production efficiency while reducing wastage rates or producing lower quality compounds that can be better than existing ones without sacrificing their benefits over others.

Method used

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  • Method for preparing methyl carhamate

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Embodiment approach

[0011] The preparation method is as follows: put urea and methanol into the reaction kettle at a ratio of 1:1.5, add a methanol-soluble catalyst and a high-boiling point solvent that has no corrosion effect on the equipment in a ratio of 1:1:70, mix them, and heat them with steam. Reactor, to 130°C, constant temperature 130-160°C, stirring, and use a vacuum pump to evacuate the pressure in the kettle to 0MPa. After 8 hours of synthesis reaction, react to synthesize the crude product of methyl carbamate, and put the crude product into the atmospheric distillation tower for distillation After the light fraction is removed, the semi-finished product of methyl carbamate is obtained by centrifugal separation in a centrifuge. The semi-finished product is put into a vacuum distillation tower, the pressure is controlled at 2600-2800Pa, and the fraction at 70-80°C is collected to obtain a content of 99.4- 99.8% pure methyl carbamate.

[0012] A kind of preparation method main process c...

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Abstract

The invention relates to a method for preparing methyl carhamate, which is mainly used for preparing the methyl carhamate. The preparation method mainly comprises the following steps: taking urea and methanol as raw materials, mixing a catalyst which has no corrosiveness on equipment and can be dissolved in the methanol, and a solvent with high boiling point in proportion, placing the mixture into a reaction kettle, performing synthesis reaction on the mixture for 8 hours in the reaction kettle at the temperature of between 130 and 160 DEG C and under the pressure of 0 MPa, synthesizing coarse products of methyl carhamate after reaction, obtaining semifinished products of methyl carhamate after performing distillation on the coarse products of methyl carhamate in an atmospheric distillation tower, removing light fractions, and performing centrifugal separation on the obtained products in a centrifuge, and obtaining pure products of methyl carhamate with the content of between 99.4 and 99.8 percent after performing vacuum distillation on the semifinished products at the pressure of between 2,600 and 2,800 Pa and collecting fractions at the temperature of between 70 and 80 DEG C. The products are widely used in the industries of medicaments, pesticides, rubber manufacture and the like.

Description

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Claims

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Application Information

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Owner KENLI SANHE NEW MATERIAL TECH
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