Dimethyl carbonate preparation method

A technology of dimethyl carbonate and methanol, applied in the field of preparation of dimethyl carbonate, can solve problems such as easy loss, equipment corrosion activity, reduction, etc., and achieve the effects of reducing costs and overcoming catalyst deactivation

Inactive Publication Date: 2014-04-09
唐雅蓉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Dimethyl carbonate is a rising new product of chemical raw materials. It was registered as a non-toxic chemical in Europe in 1992. Among many DMC synthesis processes, methanol gas-phase oxidative carbonylation method uses methanol, CO and O2 as raw materials, and the production cost is low. The product The selectivity is high, and it is an important green chemical route in line with my country's coal-based energy. However, in the methanol gas-phase oxidative carbonylation process, Cl - Susceptible to bleed-off, leading to equipment corrosion and gradual loss of activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add 0.3 grams of catalyst into the reactor, feed methanol at a flow rate of 0.02 ml / min, and feed CO and o 2 , After reacting for 3 hours, the reacted mixture was separated by a gas-liquid separator to obtain a liquid phase mixture, and then the liquid phase mixture was distilled to obtain dimethyl carbonate.

Embodiment 2

[0016] Add 0.3 grams of catalyst to the reactor, feed methanol at a flow rate of 0.08 ml / min, and feed CO and o 2 , After reacting for 5 hours, the reacted mixture was separated by a gas-liquid separator to obtain a liquid phase mixture, and then the liquid phase mixture was distilled to obtain dimethyl carbonate.

Embodiment 3

[0018] Add 0.4 grams of catalyst to the reactor, feed methanol at a flow rate of 0.1 ml / min, and feed CO and o 2 , After reacting for 4 hours, the reacted mixture was separated by a gas-liquid separator to obtain a liquid phase mixture, and then the liquid phase mixture was distilled to obtain dimethyl carbonate.

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PUM

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Abstract

The invention belongs to the chemical industry catalysis field, and discloses a dimethyl carbonate preparation method. The method is characterized in that a reaction of methanol, CO and O2 is carried out in the presence of carbon-based supported nano-Cu as a catalyst to synthesize dimethyl carbonate, and the method comprises the following steps: adding the catalyst to a reactor, adding methanol, introducing CO and O2, and reacting at a temperature of 120-180DEG C under a pressure of 0.4-0.8Mpa for 2-5h to prepare dimethyl carbonate. Cl<-> existing in routine methods is not used in the reaction process of the method, so the method does not corrode apparatuses, the cost is reduced, and a problem that the catalyst inactivation caused by the Cl<-> loss is overcome.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a preparation method of dimethyl carbonate Background technique [0002] Methanol is a bulk chemical produced from coal or natural gas. Its deep processing is an important research field that many countries are competing to develop. Among the many downstream products of methanol, the green chemical dimethyl carbonate (DMC) has received a lot of attention in recent years. Great attention. DMC has a wide range of uses. It can replace highly toxic or carcinogenic chemicals such as phosgene, dimethyl sulfate, and methyl chloroformate for organic synthesis, and can also be used as a high-quality solvent or fuel additive. With the further upgrade of motor vehicle emission standards, the market for DMC to be used in fuel additives is huge. Dimethyl carbonate can be used to prepare polyurethane, polycarbonate, medicine, pesticide, spice, etc.; it can replace dimethyl sulfate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C69/96C07C68/00B01J23/72
CPCC07C68/01C07C69/96
Inventor 唐雅蓉
Owner 唐雅蓉
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