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Method for directly preparing methyl ethyl carbonate from ethylene carbonate or propylene carbonate

A technology of propylene carbonate and ethylene carbonate, applied in the preparation of carbonate/haloformate, purification/separation of carbonate/haloformate, chemical instruments and methods, etc., can solve the production cost and price Advanced problems, to achieve the effect of good product quality, lower production costs, and lower preparation costs

Pending Publication Date: 2022-07-29
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, these two process routes can only be obtained by using DMC or DEC as raw materials, especially the second route, DEC is also synthesized by DMC, which inevitably leads to the production cost and price of EMC being higher than that of DMC and DEC

Method used

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  • Method for directly preparing methyl ethyl carbonate from ethylene carbonate or propylene carbonate
  • Method for directly preparing methyl ethyl carbonate from ethylene carbonate or propylene carbonate
  • Method for directly preparing methyl ethyl carbonate from ethylene carbonate or propylene carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The immobilized dual-nuclear ionic liquid catalyst was packed into a bundle, and placed in a reactive distillation column at alternate intervals with structured packing. Methanol, ethanol and ethylene carbonate were mixed by a static mixer in a mass ratio of 3.5:5.5:1, and then injected into In the reactive distillation column, the temperature at the bottom of the column is 95 °C, the temperature at the top of the column is 80 °C, the pressure is normal pressure, the reflux ratio is 3.0, and the mass space velocity is 4h -1 The transesterification reaction was carried out under the conditions. The mixture of methanol, ethanol and a small amount of dimethyl carbonate is withdrawn from the top of the reactive distillation column, and then returned to the static mixer for recycling. The bottom of the reactive distillation column is a mixture of ethyl methyl carbonate, diethyl carbonate, ethylene carbonate and ethylene glycol, and ethyl methyl carbonate, diethyl carbonate a...

Embodiment 2

[0038] The immobilized dual-nuclear ionic liquid catalyst is packed into a bundle, and placed in a reactive distillation column alternately with structured packing. Methanol, ethanol and propylene carbonate are mixed in a static mixer at a mass ratio of 1:1.5:1, and then injected into In the reactive distillation column, the temperature at the bottom of the column is 90 °C, the temperature at the top of the column is 78 °C, the pressure is normal pressure, the reflux ratio is 1.0, and the mass space velocity is 0.4h -1 The transesterification reaction was carried out under the conditions. The mixture of methanol, ethanol and a small amount of dimethyl carbonate is withdrawn from the top of the reactive distillation column, and then returned to the static mixer for recycling. The bottom of the reactive distillation column is a mixture of methyl ethyl carbonate, diethyl carbonate, propylene carbonate and propylene glycol. Through rectification, methyl ethyl carbonate, diethyl ca...

Embodiment 3

[0042]The immobilized dual-nuclear ionic liquid catalyst is packed into a bundle, and placed in a reactive distillation column alternately with structured packing. Methanol, ethanol and ethylene carbonate are mixed by a static mixer in a mass ratio of 2:4:1, and then injected into In the reactive distillation column, the temperature at the bottom of the column is 92 °C, the temperature at the top of the column is 79 °C, the pressure is normal pressure, the reflux ratio is 2.0, and the mass space velocity is 1.0h -1 The transesterification reaction was carried out under the conditions. The mixture of methanol, ethanol and a small amount of dimethyl carbonate is withdrawn from the top of the reactive distillation column, and then returned to the static mixer for recycling. The bottom of the reactive distillation column is a mixture of ethyl methyl carbonate, diethyl carbonate, ethylene carbonate and ethylene glycol, and ethyl methyl carbonate, diethyl carbonate and ethylene glyc...

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Abstract

The invention discloses a method for directly preparing methyl ethyl carbonate from ethylene carbonate or propylene carbonate, and belongs to the technical field of chemical industry. According to the method, the immobilized binuclear ionic liquid catalyst is adopted to catalyze ethylene carbonate or propylene carbonate to directly prepare ethyl methyl carbonate, so that raw materials such as dimethyl carbonate or diethyl carbonate can be avoided, the production cost of ethyl methyl carbonate can be greatly reduced, the production process is simplified, the energy consumption is low, and the product quality is good. Meanwhile, by adopting the immobilized binuclear ionic liquid catalyst, the conversion rate of ethylene carbonate or propylene carbonate can reach 90% or above, the selectivity of ethyl methyl carbonate exceeds 85%, and the immobilized binuclear ionic liquid catalyst has good economic significance.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for directly preparing ethyl methyl carbonate from ethylene carbonate or propylene carbonate. Background technique [0002] Ethyl Methyl Carbonate (EMC) is a widely used asymmetric carbonate compound, mainly used as a solvent and an intermediate in organic synthesis, especially as an excellent solvent for non-water-soluble electrolytes in lithium-ion batteries. Since the molecular structure of EMC has both methyl and ethyl groups, and has the characteristics of dimethyl carbonate (DMC) and diethyl carbonate (DEC), it can improve the energy density and discharge capacity of the battery, and can improve the safety. performance and extended service life, as well as good low temperature performance. [0003] At present, there are two main technical routes for industrial production of EMC: one is to use DMC as raw material, and through transesterificati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/065C07C68/08C07C69/96B01J31/02
CPCC07C68/065C07C68/08B01J31/0295B01J31/0281B01J31/0285B01J2231/49C07C69/96Y02P20/10
Inventor 罗辉张鹤邓文安杨慧民李传杜峰李庶峰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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