Energy-saving and consumption-reducing method for producing dimethyl carbonate by transesterification method

A technology of dimethyl carbonate and transesterification, used in the preparation of carbonate/haloformate, chemical instruments and methods, preparation of organic compounds, etc.

Pending Publication Date: 2021-09-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Therefore, in the prior art, there is still no way to see that propylene oxide or ethylene oxide c

Method used

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  • Energy-saving and consumption-reducing method for producing dimethyl carbonate by transesterification method

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Embodiment 1

[0037] The specification of the straight tube reactor (1) is Φ450×20000mm, and the size of the adiabatic reactor (3) is Φ400×20000mm. Both reactors adopt the operation mode of bottom-in and top-out. First fill up the propylene carbonate containing 50kg composite ionic liquid catalyst in the straight tube reactor (1), start to feed the raw materials propylene oxide and carbon dioxide after the temperature rises and boosts the pressure, the feed rate of propylene oxide is 500kg / h, the amount of carbon dioxide The feed rate is 417kg / h, the top discharge of the straight tube reactor (1) enters the tube side of the evaporative cooler (2), and 740kg / h of liquid phase methanol is pumped into the shell side, and the methanol enters after gasification To the lower part of the reactive distillation tower (8), the reaction temperature of the straight tube reactor (1) is controlled at 135~140°C, and the reaction pressure is controlled at 4.5MPa; the reaction material enters the flash tank ...

Embodiment 2

[0040] The specification of the straight tube reactor (1) is Φ400×18000mm, and the size of the adiabatic reactor (3) is Φ350×18000mm. Both reactors adopt the operation mode of bottom in and top out. First fill up the ethylene carbonate containing 38kg composite ionic liquid catalyst in the straight tube reactor (1), start to feed the raw materials ethylene oxide and carbon dioxide after the temperature rises and boost the pressure, the feed rate of ethylene oxide is 400kg / h, The feed rate of carbon dioxide is 440kg / h, the top discharge of the straight tube reactor (1) enters the tube side of the evaporative cooler (2), and 1960kg / h of liquid phase methanol is pumped into the shell side, and the methanol is vaporized Then enter the lower part of the reactive distillation tower (8), the reaction temperature of the straight tube reactor (1) is controlled at 125~135°C, and the reaction pressure is controlled at 4.3MPa; the reaction material enters the flash reactor (3) after passin...

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Abstract

The invention relates to an energy-saving and consumption-reducing method for producing dimethyl carbonate by a transesterification method, the method comprises the following steps: reaction heat from heat released in a process of synthesizing propylene carbonate (or ethylene carbonate) is removed by reacting propylene oxide (or ethylene oxide) with CO2 through a kettle type evaporator by methanol gasification; the vaporized methanol goes into the transesterification reaction distillation column, the thermal load of the reactive distillation tower is reduced, and the energy-saving effect is achieved. The method has the advantages of simple flow and low investment, optimizes the production process of the dimethyl carbonate by the transesterification method, and can reduce the steam consumption by more than 10% compared with a production device with the same scale.

Description

technical field [0001] The invention belongs to the field of fine chemical production, and in particular relates to an energy-saving and consumption-reducing method for producing dimethyl carbonate by transesterification. Background technique [0002] Dimethyl carbonate (DMC) is a very useful organic compound, which was listed as a non-toxic chemical by Europe in 1992. Because its molecule contains carbonyl, methyl, methoxy and carbonylmethoxy, it can be used as an intermediate in organic synthesis, and can replace dimethyl sulfate (very toxic) as a methylating agent and as a substitute for phosgene (Very toxic) As a carbonylating agent, it can also be used as a gasoline additive to increase the octane number and oxygen content of gasoline. It can also be used as a paint solvent. DMC has excellent solubility for lithium salts and low viscosity. Therefore, it can be used as the electrolyte of lithium batteries, and has been widely used in electric vehicles and 5G base statio...

Claims

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Application Information

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IPC IPC(8): C07C69/96C07C68/065
CPCC07C68/065C07D317/36C07D317/38C07C69/96Y02P20/584Y02P20/10
Inventor 方云进沈卫华
Owner EAST CHINA UNIV OF SCI & TECH
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