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Purification device and method for high-purity ethylene carbonate

A ethylene carbonate, high-purity technology, applied in organic chemistry, etc., can solve the problems of difficult purification and achieve the effects of large-scale production, low energy consumption, and low purity requirements

Active Publication Date: 2022-01-28
DONGYING HI TECH SPRING CHEM IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to obtain battery-grade ethylene carbonate, various purification technologies have been proposed. Because industrial-grade ethylene carbonate products contain impurities such as ethylene glycol, diethylene glycol, and water, it is difficult to purify them.

Method used

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  • Purification device and method for high-purity ethylene carbonate

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Embodiment 1

[0031] Such as figure 1As shown, the embodiment of the present invention provides a purification device for high-purity ethylene carbonate, including a purifying agent storage tank 1, a dissolution kettle 2, a purification crystallization kettle 3, a purification filter 4, a purification dryer 5, and a purification and drying gas condenser 6. Filtrate treatment tower 7, filtrate treatment tower overhead condenser 8, filtrate treatment tower condensate tank 9, filtrate treatment tower reboiler 10, recovery crystallization kettle 11, recovery filter 12 and purifying agent cooler 13; The top of the purifying agent storage tank 1 is provided with a fresh purifying agent inlet, a dry condensate inlet and a filtrate treatment tower top production liquid inlet; The liquid inlet at the top is connected with the inlet of the purifying agent cooler 13; the purifying agent cooler 13 is connected with the inlet located at the top of the purifying filter 4; The filter cake inlet of the re...

Embodiment 2

[0043] The purification device and method of embodiment two are the same as embodiment one, and the difference is: the fresh purifying agent is ethyl acetate; The purity of the ethylene carbonate crude product raw material that adds to dissolving kettle 2 is 99.5wt%; Adds to dissolving kettle 2 The quality of the raw material of ethylene carbonate crude product is 0.2 times the quality of the added purifying agent; the temperature of the liquid in the dissolution kettle 2 is 60°C, and it dissolves for 2 hours; the temperature of the purification crystallization kettle 3 is -3°C, and the crystallization time is 10 hours; purification and filtration Carried out at -3°C, the purified filter cake was washed 5 times with the purifying agent cooled to -3°C by the purifying agent cooler 13 from the purifying agent storage tank 1 and then sent to the purifying drier 5 for drying. The quality of the purifying agent used for washing and purifying the filter cake is 1 times of the quality...

Embodiment 3

[0045] The purification device and method of embodiment three are the same as those in embodiment one, except that the fresh purifying agent is a mixture of absolute ethanol and ethyl acetate, wherein the mass ratio of absolute ethanol to ethyl acetate is 99:1; 2 The purity of the ethylene carbonate crude product raw material that adds is 90wt%; The quality of the ethylene carbonate crude product raw material that adds to dissolution kettle 2 is 0.6 times of the ethyl acetate quality that adds; The temperature of liquid in the dissolution kettle 2 is 50 ℃, Dissolved for 1 hour; the temperature of the purification crystallization kettle 3 was 6° C., and the crystallization time was 5 hours; the purification and filtration were carried out at 6° C., and the purification filter cake was cooled to 6° C. by the purification agent cooler 13 from the purification agent storage tank 1 After the purifying agent is washed 3 times, it is sent to the purifying drier 5 for drying, and the q...

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Abstract

The invention provides a purification device and method for high-purity ethylene carbonate, and relates to the field of purification devices. The purification device for the high-purity ethylene carbonate comprises a purifying agent storage tank, a dissolving kettle, a purification crystallization kettle, a purification filter, a purification dryer, a purified dry gas condenser, a filtrate treatment tower, a filtrate treatment tower overhead condenser, a filtrate treatment tower condensate tank, a filtrate treatment tower kettle reboiler, a recovery crystallization kettle, a recovery filter and a purifying agent cooler. By utilizing the characteristics that the solubility of ethylene carbonate in a purifying agent is reduced along with the reduction of the temperature, and substances such as ethylene glycol and diethylene glycol can be mixed and dissolved with the purifying agent in any ratio, the substances such as the ethylene glycol and the diethylene glycol are dissolved in the purifying agent by adopting a dissolving and cooling crystallization method, and the ethylene carbonate is crystallized and separated out, so that the high-purity ethylene carbonate can be obtained; and as long as the purity of the raw material ethylene carbonate is greater than or equal to 85wt%, the high-purity ethylene carbonate product with the purity greater than or equal to 99.97 wt% can be obtained.

Description

technical field [0001] The invention relates to the technical field of purification devices, in particular to a purification device and method for high-purity ethylene carbonate. Background technique [0002] In recent years, with the development of new energy industries such as wind energy, solar energy, and electric vehicles in my country, the demand for high-performance energy storage batteries is also increasing. Lithium-ion batteries are currently a storage battery with better charge-discharge performance. Energy batteries have also been developed unprecedentedly, and the demand is increasing, so the demand for battery-grade ethylene carbonate used in the preparation of lithium-ion batteries is also increasing. [0003] In order to obtain battery-grade ethylene carbonate, various purification techniques have been proposed. Since industrial-grade ethylene carbonate products contain impurities such as ethylene glycol, diethylene glycol, and water, it is difficult to purify...

Claims

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Application Information

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IPC IPC(8): C07D317/38
CPCC07D317/38
Inventor 肖福魁郭保全滕文彬张生安曹德龙杨金海
Owner DONGYING HI TECH SPRING CHEM IND
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