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Device and method for preparing cell grade methyl ethyl carbonate from dimethyl carbonate and ethanol

A technology of ethyl methyl carbonate and dimethyl carbonate, which is applied in the field of equipment for producing battery-grade ethyl methyl carbonate, can solve the problems of heat consumption in the tower kettle, influence on product content, and consumption of cooling capacity, and achieve low raw material cost and side effects The effect of less product and energy saving

Active Publication Date: 2020-02-28
DONGGUAN UPC IND & TRADE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(3) The transesterification reaction between dimethyl carbonate and diethyl carbonate produces ethyl methyl carbonate, no by-products are produced, and the catalyst is an alkaline substance. This route theoretically does not produce lower alcohols such as methanol and ethanol, but dimethyl carbonate Esters and diethyl carbonate will still decompose under alkaline conditions to produce lower alcohols, affecting product content
[0004] The existing technology uses homogeneous catalysts such as sodium methoxide and potassium methoxide, which consumes a lot of catalyst and takes up a lot of catalyst cost; in the prior art, circulating water is used to condense the steam at the top of the tower with circulating water, and the bottom of the tower is supplied with low-pressure steam The heat generates rising steam for the materials required for the rectification tower, and the top of each rectification tower consumes cold energy and the bottom of each tower consumes heat

Method used

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  • Device and method for preparing cell grade methyl ethyl carbonate from dimethyl carbonate and ethanol
  • Device and method for preparing cell grade methyl ethyl carbonate from dimethyl carbonate and ethanol

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Embodiment 1

[0035] Embodiment 1, a kind of device that the present invention mentions produces battery grade ethyl methyl carbonate with dimethyl carbonate and dehydrated alcohol, its technical scheme is: comprise static mixer (001), the first preheater (002 ), second preheater (003), third preheater (004), prereactor (005), reactive distillation column (100), reactive distillation column reboiler (101), diethyl carbonate Removal tower (200), first compressor (201), diethyl carbonate removal tower reboiler (202), ethyl methyl carbonate rectification tower (300), second compressor (301), methyl carbonate Ethyl distillation column reboiler (302), first water cooler (102) and second water cooler (303),

[0036] The inlet of the static mixer (001) is connected to the raw material DMC and raw material EA feeding pipelines respectively, the outlet is connected to the inlet of the first preheater (002) tube side, and the outlet of the first preheater (002) tube side is connected to the second T...

Embodiment 2

[0056] Embodiment 2, production device is identical with embodiment 1, and production process is identical with embodiment 1, and concrete operation condition is:

[0057] Dimethyl carbonate and absolute ethanol enter the static mixer (001), the first preheater (002), the second preheater (003), and the third preheater (004) at a molar ratio of 1.2:1 Preheat to the reaction temperature of 102°C, and enter the pre-reactor (005) together for pre-reaction;

[0058] The top temperature of the reactive distillation column (100) is 64.6°C, the top pressure is 103kpa, the bottom temperature is 103°C, the bottom pressure is 108kpa, and the top reflux ratio is 4.3:1;

[0059] The temperature at the top of the diethyl carbonate removal tower (200) is 98°C, the pressure at the top of the tower is 102kpa; the temperature of the tower bottom is 131°C, the pressure of the bottom is 106kpa, and the feed inlet is 0.42 times the height of the whole tower from the reflux port; the distillation ...

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Abstract

The invention relates to a device and method for preparing cell grade methyl ethyl carbonate from dimethyl carbonate and ethanol. The device comprises a static mixer, a multi-grade pre-heater, a pre-reactor, a reactive distillation column, a reactive distillation column re-boiler, a diethyl carbonate removing tower, a first compressor, a diethyl carbonate removing tower re-boiler, a methyl ethyl carbonate rectifying tower, a second compressor, a methyl ethyl carbonate rectifying tower re-boiler, a first water cooler, and a second water cooler. The components mentioned above are connected to form the device. Steam collected from the top of the reactive distillation column and hot materials in the methyl ethyl carbonate rectifying tower supply heat to the reaction materials, and steam consumption is reduced. Only the re-boiler in a dimethyl carbonate rectifying tower consumes low pressure steam, and other towers do not consume low pressure steam. Moreover, the product meets the cell grade requirements, the quality is stable, no dangerous solid waste containing organic substances is generated; the raw material cost is low, the byproducts are few, and the energy is saved.

Description

technical field [0001] The invention relates to a device and a method for producing battery-grade ethyl methyl carbonate, in particular to a device and a method for producing battery-grade ethyl methyl carbonate with dimethyl carbonate and ethanol. Background technique [0002] Ethyl Methyl Carbonate (Ethyl Methyl Carbonate), also known as ethyl methyl carbonate, is a colorless transparent liquid, insoluble in water, and can be used in organic synthesis. It is an excellent solvent for lithium-ion battery electrolyte. [0003] There are several ways to synthesize ethyl methyl carbonate by transesterification: (1) Dimethyl carbonate (DMC) reacts with absolute ethanol (EA) to generate ethyl methyl carbonate (EMC), by-product methanol, and the catalyst can be alkaline Basic catalysts such as ionic liquids, alcohol bases or immobilized ionic liquids and alcohol bases. (2) Diethyl carbonate (DEC) reacts with methanol to produce ethyl methyl carbonate by-product ethanol, and the c...

Claims

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Application Information

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IPC IPC(8): C07C68/06C07C68/08C07C69/96
CPCC07C68/06C07C68/08C07C69/96Y02E60/10B01D3/009B01D3/143
Inventor 李新郭建军马国李光科
Owner DONGGUAN UPC IND & TRADE
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