Crystallization and purification process of high-purity ethylene carbonate

A technology of crystallization of ethylene carbonate, applied in the crystallization and purification process field of high-purity ethylene carbonate, can solve the problems of low yield, high energy consumption, low product purity, etc., achieve improved purity, mild process, improved purity and Yield effect

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] What the present invention aims to solve is the technical problems of high energy consumption, low product purity and low yield when separating and purifying ethylene carbonate in the prior art, and provides a static crystallization purification process for high-purity ethylene carbonate, which has the product Advantages of high purity, high yield and low energy consumption

Method used

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  • Crystallization and purification process of high-purity ethylene carbonate
  • Crystallization and purification process of high-purity ethylene carbonate
  • Crystallization and purification process of high-purity ethylene carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0043] according to figure 1 As shown in the flow process, the weight percent composition is ethylene carbonate 90.15%, ethylene glycol 6.23%, and other 3.62% EC raw materials are preheated and melted, and then added such as Figure 4 The first-stage static crystallization is carried out in the static crystallizer shown, in which the number of internal heat exchange tubes is 1, and the support on the heat exchange tubes is a single-layer stainless steel wire mesh, whose height is equal to the liquid level in the crystallizer. The external jacket is kept at a constant temperature of 34°C, the seed crystal addition temperature is 34°C, the internal heat exchange tube is cooled by program, the cooling rate is 0.01°C / min, the crystallization end point temperature is 15°C, and the crystallization is stopped after 60 minutes at the end point temperature, and the drain at the bottom of the static crystallizer is opened At the feeding port, the sweating of the crystals begins after th...

Embodiment 2

[0046] according to figure 2 Shown flow process adopts the raw material composition identical with embodiment 1, joins in such as Figure 4 The first-stage static crystallization & sweating are carried out in the static crystallizer shown, and the process parameters are the same as in Example 1, wherein the number of internal heat exchange tubes is 1, and the support on the heat exchange tubes is a single-layer stainless steel wire mesh, with a height of It is flush with the liquid level in the crystallizer, the outer jacket is kept at a constant temperature of 34°C, the seeding temperature is 34°C, the internal heat exchange tube is cooled by program, the cooling rate is 0.01°C / min, the crystallization end point temperature is 15°C, and the end point temperature is kept at a constant temperature for 60 minutes before stopping Crystallization, open the discharge port at the bottom of the static crystallizer, drain the mother liquor and start sweating of the crystals. At this ...

Embodiment 3

[0049] according to image 3 Shown flow process adopts the raw material composition identical with embodiment 1, joins in such as Figure 4The first-stage static crystallization & sweating are carried out in the static crystallizer shown, and the process parameters are the same as in Example 1, wherein the number of internal heat exchange tubes is 1, and the support on the heat exchange tubes is a single-layer stainless steel wire mesh, with a height of It is flush with the liquid level in the crystallizer, the outer jacket is kept at a constant temperature of 34°C, the seeding temperature is 34°C, the internal heat exchange tube is cooled by program, the cooling rate is 0.02°C / min, the crystallization end point temperature is 15°C, and the end point temperature is kept at a constant temperature for 60 minutes before stopping Crystallization, open the discharge port at the bottom of the static crystallizer, drain the mother liquor and start sweating of the crystals. At this ti...

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Abstract

The invention relates to a crystallization and purification process of high-purity ethylene carbonate, and mainly solves the technical problems of high energy consumption, low product purity, low yield and the like when ethylene carbonate is separated and purified in the prior art. According to the technical scheme, the method comprises the following steps: a raw material containing ethylene carbonate is introduced into a static crystallizer for primary static crystallization and sweating; and while a high-purity ethylene carbonate crystal product is obtained, an obtained crystallization mother liquor and a sweating sweat are continuously introduced into a static crystallizer with the same structure to carry out secondary static crystallization and sweating, so that the technical problemsare better solved, and the method can be applied to industrial production of ethylene carbonate, especially power battery grade ethylene carbonate.

Description

technical field [0001] The invention relates to a crystallization and purification process of high-purity ethylene carbonate, which can be used in the industrial production of ethylene carbonate, especially power battery grade ethylene carbonate, and can be further used in the industry of lithium batteries as an electrolyte solvent for high-energy lithium batteries in production. Background technique [0002] In recent years, with the continuous rise of the electric vehicle market, the demand for power batteries as a core component is also increasing rapidly. At present, power batteries are still dominated by lead-acid battery technology, nickel-metal hydride battery technology, fuel cell technology, and lithium battery technology. Lithium-ion batteries are based on their small size, light weight, high capacity, long life, safety, reliability, and pollution-free characteristics. , is the main direction of battery research and development for pure electric vehicles at presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C68/08C07C69/96
CPCC07C68/08C07C69/96Y02P70/50
Inventor 郭艳姿蔡立鑫陈亮
Owner CHINA PETROLEUM & CHEM CORP
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