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High-purity vinylene carbonate as well as production method and application thereof

A vinylene carbonate and ethylene carbonate technology, applied in the field of high-purity vinylene carbonate, can solve the problems of insufficiency, poor economy, and increased energy consumption, and achieve the effects of eliminating residues, reducing energy consumption, and saving time

Pending Publication Date: 2022-07-08
SHANGHAI DONGGENG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Yet, adopt this method to produce high-purity vinylene carbonate, need the vinylene carbonate crude product that obtains purity about 60% to carry out three-stage rectification process (one-stage distillation is carried out in desolventizing tower, after one-stage distillation process Finally, the purity of the product is about 97%. The secondary distillation is carried out in the light removal tower or the crude distillation tower. After the secondary distillation treatment, the purity of the product is about 98%. , after the three-stage rectification treatment, the purity of the product is about 98.5%), the energy consumption is higher (about 3600kg steam / t product), and the product purity obtained is only 98.5%, which cannot meet the application needs of the electronic field. In order to further improve the purity of the product, it is necessary to continue to carry out two rectification treatments to increase the purity of the product to about 99.5%, which further increases energy consumption (about 8000kg steam / t product), leading to an enlarged production process less economical

Method used

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  • High-purity vinylene carbonate as well as production method and application thereof
  • High-purity vinylene carbonate as well as production method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] using as figure 1 The production system shown produces vinylene carbonate and includes a primary reaction unit 1 , a secondary reaction unit 2 , a purification unit 3 , a by-product recovery unit 4 and a triethylamine recovery unit 5 .

[0040] The primary reaction unit 1 includes a first photolysis reaction tower 11, a second photolysis reaction tower 12 and a deacidification tower 13. The first photolysis reaction tower 11 and the second photolysis reaction tower 12 are used as containers for the chlorination reaction. An ultraviolet light assembly (not shown) and a temperature adjustment assembly (not shown) are arranged inside. The ultraviolet light assembly is used to provide ultraviolet light conditions for the chlorination reaction, and the temperature adjustment assembly is used to control the temperature of the chlorination reaction. The photolysis reaction tower is in the prior art and will not be repeated here.

[0041] The first photolysis reaction tower 11...

Embodiment 2

[0079] like figure 2 The production system shown, the difference between this example and Example 1 is: the temperature of the precipitation treatment is 40 ° C, the pressure is 9 kPa; the communication pipeline between the precipitation tower 31 and the falling film crystallizer 32 The distillation column 33 and the falling film crystallizer 32 are communicated with the lower part or bottom of the crude distillation column 33 through a circulating pump (not shown). Impurities such as polymerization inhibitor butyl-p-cresol (BHT) and polyethylene carbonate can be removed by distillation through the crude distillation column 3, and the purity of the final product can be further improved. The temperature of the crude distillation column 32 is 58°C, and the pressure is 3kPa;

[0080] The molar ratio of the total amount of chlorine gas and the total amount of ethylene carbonate in the first photolysis reaction tower 11 and the second photolysis reaction tower 12 is 0.6:3, and th...

Embodiment 3

[0107] The difference between this example and Example 2 is that: the temperature of the precipitation treatment is 36°C, and the pressure is 6kPa; the temperature of the rough dipping treatment is 50°C, and the pressure is 4kPa; the first photolysis reaction tower 11 and the second photolysis tower 11 are The molar ratio of the total amount of chlorine gas and the total amount of ethylene carbonate in the hydrolysis reaction tower 12 is 0.5:2.5, the first photolysis reaction tower 11 and the second photolysis reaction tower 12 are heated to 64 ° C, and the chlorination reaction time is 1.5 h, in the chlorination reaction liquid entering the deacidification tower 13, the dichloroethylene carbonate content is 0.69wt%;

[0108] The molar ratio of the total amount of remover triethylamine to the total amount of high-purity chlorinated ethylene carbonate (CEC) is 1:1.2, and the total amount of polymerization inhibitor butyl-p-cresol (BHT) to the total amount of high-purity chlorina...

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Abstract

The invention relates to the technical field of organic synthesis, in particular to high-purity vinylene carbonate as well as a production method and application thereof. The production method comprises a chlorination reaction step, a dechlorination reaction step and a purification step, the chlorination reaction comprises the following steps: carrying out the chlorination reaction under ultraviolet irradiation by taking ethylene carbonate as a raw material and chlorine as a chlorinating agent, and the molar ratio of the chlorine to the ethylene carbonate is (0.4-0.6): (2-3). By reducing the ratio of chlorine to ethylene carbonate, the energy consumption can be obviously reduced.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a high-purity vinylene carbonate and a production method and application thereof. Background technique [0002] In recent years, the rapid development of new energy vehicles and high-performance batteries has driven the rapid development of the vinylene carbonate industry. [0003] Vinylene carbonate (VC for short) is a very important organic intermediate. It has the following excellent properties: effectively improve the performance of the battery, improve the compatibility of the positive and negative electrodes and the stability of the negative electrode, improve the capacity of the positive electrode, and prolong the life of the lithium ion battery. cycle life. Vinylene carbonate is mainly used as an additive and surface coating component of low-temperature electrolytes of lithium batteries. It can also be used to immobilize enzymes and as a monomer of vinylene car...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/40H01M10/0567H01M10/62
CPCC07D317/40H01M10/0567H01M10/62Y02E60/10
Inventor 唐曦邹志刚陈孝建钟显威贾凤刚邓任军刘晓花高毅陈真梁振刘琦
Owner SHANGHAI DONGGENG CHEM TECH CO LTD
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