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Vinylene carbonate production method and production system

A technology of vinylene carbonate and ethylene carbonate, which is applied in the field of production methods and production systems of vinylene carbonate, can solve the problems of large-scale economy of the process system, troublesome by-product treatment, low purity of crude products, etc., and achieve omission of solvent removal Eliminate steps, reduce energy consumption, and achieve high purity

Pending Publication Date: 2022-08-09
SHANGHAI DONGGENG CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, this method has the following problems: the first step reaction will produce mixed gas SO 2 and HCl, it is difficult to recycle and process, causing great environmental pollution and high processing costs, which is not conducive to industrial production
However, at present, the processing capacity of a single set of equipment for the process system and process method used in industrial production is relatively low, not only the loss of raw materials is large, the treatment of by-products is troublesome, and the purity of the obtained crude product is low, it is necessary to produce high-purity electronic grade products. Carrying out multiple rectification and purification, the energy consumption is very high, resulting in low economical efficiency of process system enlargement

Method used

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  • Vinylene carbonate production method and production system
  • Vinylene carbonate production method and production system
  • Vinylene carbonate production method and production system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 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 .

[0065] The primary reaction unit 1 includes a first photolysis reaction tower 11, a second photolysis reaction tower 12, a deacidification tower 13 and a rectification tower 14. The first photolysis reaction tower 11 and the second photolysis reaction tower 12 are used as chlorination towers. The reaction vessel is provided with an ultraviolet light assembly (not shown) and a temperature adjustment assembly (not shown), the ultraviolet light assembly is used to provide ultraviolet light conditions for the chlorination reaction, and the temperature adjustment assembly is used to adjust the chlorination reaction. temperature. The photolysis reaction tower is in the prior art and will not be repeated here.

[0066] The first photolysis r...

Embodiment 2

[0111] 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 10 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 33, thereby further improving the purity of the final product. The temperature of the crude distillation treatment is 55°C, and the pressure is 2kPa; the purity of the material after being processed by the crude distillation column 32 is 98%;

[0112] The molar ratio of the total amount of chlorine gas to the total amount of ethylene carbonate in the fir...

Embodiment 3

[0138] The difference between this example and Example 2 is that the molar ratio of the total amount of chlorine gas to the total amount of ethylene carbonate in the first photolysis reaction tower 11 and the second photolysis reaction tower 12 is 0.5:2.5, and the triethylamine The molar ratio of the total amount to the total amount of high-purity chlorinated ethylene carbonate (CEC) is 1:1.2, and the molar ratio of the total amount of vinylene carbonate to the total amount of high-purity chlorinated ethylene carbonate (CEC) is 1:1.2, The mass ratio of the total amount of butyl-p-cresol (BHT) to the total amount of high-purity chlorinated ethylene carbonate (CEC) is 0.3:100, the temperature of the chlorination reaction is 64°C, the time of the chlorination reaction is 1.5h, and the chlorine The content of dichloroethylene carbonate in the substitution reaction liquid is 0.71wt%; the temperature of the dechlorination reaction is 64°C, and the time of the dechlorination reaction ...

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Abstract

The invention relates to the technical field of organic synthesis, in particular to a production method and a production system of vinylene carbonate. The production method comprises the following steps: S1, taking ethylene carbonate and chlorine as raw materials, and performing chlorination reaction under ultraviolet irradiation to obtain an intermediate product chloroethylene carbonate; s2, the chloroethylene carbonate obtained in the step S1 is placed in a reaction kettle containing a solvent, an acid-binding agent and a polymerization inhibitor to be subjected to a dechlorination reaction, dimethyl carbonate is used for washing a dechlorination reaction product, an obtained liquid phase is treated through a desolventizing tower and then subjected to melt crystallization, vinylene carbonate is obtained, and vinylene carbonate is adopted as the solvent. According to the method disclosed by the invention, the solvent dimethyl carbonate adopted in the traditional dechlorination reaction step is adjusted into the target product vinylene carbonate, so that the subsequent step of removing the solvent is avoided, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a production method and production system of vinylene carbonate. Background technique [0002] Vinylene Carbonate (VC), also known as 1,3-dioxol-2-one, has the chemical formula C 3 H 2 O 3 , the density is 1.355g / ml, the melting point is 22°C, the boiling point is 73-74°C (4.27kPa), 162°C (0.1MPa), it is a colorless and transparent liquid, and is a highly heat-sensitive substance. Decomposition occurs in 1h, and decomposition occurs in a few minutes at 80°C. [0003] Vinylene carbonate is widely used as an electrolyte additive for lithium ion batteries, a surface coating component, and is a polymer monomer that can be used in the preparation of polyethylene carbonate and other polymers thing. Vinylene carbonate (VC) is an organic film-forming aid for lithium-ion battery electrolyte, and it is the core additive in lithium-ion battery electrolyte. Solid electrolyte ...

Claims

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Application Information

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IPC IPC(8): C07D317/40B01J19/00B01J19/12B01D9/02B01D3/00B01D3/14
CPCC07D317/40B01J19/00B01J19/123B01D9/0059B01D3/009B01D3/143Y02E60/10
Inventor 康小玲张飞邹志刚高毅李明全陈真陈孝建龚一贵梁振邓剑伟李元彬
Owner SHANGHAI DONGGENG CHEM TECH CO LTD
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