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Method for recycling unreacted chlorine gas in chloroethylene carbonate synthesis

A technology of unreacted chloroethylene carbonate, which is applied in the field of recovery and reuse of unreacted chlorine gas in the synthesis of chloroethylene carbonate, and can solve problems such as unsustainable normal production, increased cost, and increased impurities

Pending Publication Date: 2021-09-14
山东安瑞源生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because sodium hypochlorite is a by-product, which contains other impurities, it cannot be sold as a formal commodity, resulting in increased costs and difficult problems; also because some companies use multiple reactors in series to carry out ethylene carbonate in chlorine. Chlorination reaction, due to The particularity of this product is that in the presence of water, it will lead to the hydrolysis of ethylene carbonate and chlorinated products, and the Zeisser reaction may occur, resulting in increased impurities and unable to continue normal production

Method used

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  • Method for recycling unreacted chlorine gas in chloroethylene carbonate synthesis

Examples

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Embodiment 1

[0014] A device for recovering and reusing unreacted chlorine gas in the synthesis of chloroethylene carbonate, comprising a three-stage water spray device 1, a water eliminator 2, a 98% sulfuric acid drying tower 3, a mist eliminator 4 and chlorine chemical reaction kettle 5, and the water eliminator 2 is connected with the three-stage water spraying device 1 through a pipeline.

Embodiment 2

[0016] On the basis of embodiment 1, the steps are as follows: (1) the mixed gas produced in the synthesis of chloroethylene carbonate is discharged into a three-stage water spray device to absorb hydrogen chloride gas to obtain 30% hydrochloric acid; (2) through the steps ( 1) The treated mixed gas enters the water eliminator, and the acid water obtained is discharged into the three-stage water spray device through the pipeline; (3) The mixed gas treated in step (2) enters the 98% sulfuric acid drying tower; (4) After The mixed gas treated in step (3) enters the demister; (5) the mixed gas treated in step (4) enters the chlorination reactor;

[0017] In the step (1), the temperature in the three-stage water spraying device is not higher than 30°C;

[0018] The temperature in the drying tower in the step (3) is not higher than 30°C.

Embodiment 3

[0020] The temperature in the step (1) in the three-stage water spraying device is 20°C;

[0021] The temperature in the drying tower in the step (3) is 10° C.; the others are the same as in Example 2.

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Abstract

The invention belongs to the technical field of chlorine gas recovery, and particularly relates to a method for recycling unreacted chlorine gas in chloroethylene carbonate synthesis. The used device comprises a three-stage water spraying device, a dehydrator, a 98% sulfuric acid drying tower, a demister and a chlorination reaction kettle which are sequentially connected through a pipeline, wherein the dehydrator is connected with the three-stage water spraying device through a pipeline.

Description

technical field [0001] The application belongs to the technical field of chlorine recovery, in particular to a method for recovery and reuse of unreacted chlorine in the synthesis of chloroethylene carbonate. Background technique [0002] Ethylene carbonate exists in the situation that chlorine cannot be fully reacted in the process of chlorine chlorination, because chlorine has only a small solubility in water, and enters the subsequent absorption of liquid sodium hydroxide aqueous solution, and reacts with sodium hydroxide to obtain Sodium hypochlorite solution. Because sodium hypochlorite is a by-product, which contains other impurities, it cannot be sold as a formal commodity, resulting in increased costs and difficult problems; also because some companies use multiple reactors in series to carry out ethylene carbonate in chlorine. Chlorination reaction, due to The particularity of this product is that in the presence of water, it will lead to the hydrolysis of ethylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D317/42C01B7/07
CPCC07D317/42C01B7/0706
Inventor 李君伟
Owner 山东安瑞源生物科技有限公司
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