Epoxy chloropropane tail gas safety improvement method

A technology of epichlorohydrin and safety, which is applied in the field of improving the safety of epichlorohydrin tail gas, and can solve problems not related to epichlorohydrin

Pending Publication Date: 2019-05-10
JIANGSU YANGNONG CHEM GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is the treatment of epichlorohydrin tail gas that is not

Method used

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  • Epoxy chloropropane tail gas safety improvement method
  • Epoxy chloropropane tail gas safety improvement method
  • Epoxy chloropropane tail gas safety improvement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation process of epichlorohydrin: throw 310g of allyl chloride in a 1000ml reaction bottle, 15g of catalyst phosphomolybdenum heteropolyacid, protect with nitrogen gas, heat up to 45°C under stirring, add 35%HP dropwise, and drop it in 4 hours. 80gHP was added dropwise, and kept at reflux for 2h. After the reaction, the temperature was slightly lowered to 36° C., poured into a separatory funnel and allowed to stand for stratification, and the oil layer, water layer and catalyst were separated. The yield of ECH was 91.7%, and the volume fraction of chloropropene in the tail gas was 15%. The volume fraction is 6%, and the volume fraction of nitrogen is 79%.

[0022] The absorption process of tail gas chloropropene: the above tail gas is passed into a pressurized reactor equipped with an aqueous solution of 28g phthalic anhydride and 14g sodium hydroxide, the reactor pressure is 0.5MPa, the catalyst is copper chloride, and the consumption is 1.0g, react at 100°C...

Embodiment 2-6

[0024] Reaction condition is the same as embodiment 1, and difference is the kind of catalyst, consumption is different, and obtained result is as follows:

[0025]

[0026]

Embodiment 7-11

[0028] Reaction condition is the same as embodiment 1, and difference is that the consumption of phthalic anhydride, sodium hydroxide is different, and gained result is as follows:

[0029]

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Abstract

The invention belongs to the technical field of organic chemical industry, and relates to an epoxy chloropropane tail gas safety improvement method, in particular to a process for preparing epoxy chloropropane by direct epoxidation of hydrogen peroxide. Reaction tail gas contains a small quantity of chloropropene, oxygen and nitrogen, the chloropropene and the oxygen have explosion limit, in orderto eliminate potential danger, the tail gas after reaction is led into under-pressure sodium phthalate water solution, the sodium phthalate water solution reacts with the chloropropene in the tail gas to generate diallyl phthalate, intrinsic safety of a process is ensured, the diallyl phthalate with higher additional values is generated, and VOC (volatile organic compounds) emission is reduced.

Description

technical field [0001] The invention belongs to the technical field of organic chemical industry, and relates to a method for improving the safety of epichlorohydrin tail gas, and more specifically, relates to a process in which epichlorohydrin is directly epoxidized by hydrogen peroxide, and the reaction tail gas contains a small amount of chlorine Propylene, oxygen and nitrogen, and there is an explosion limit between chloropropene and oxygen. In order to eliminate potential dangers, the tail gas after the reaction is passed into a pressurized aqueous solution of sodium phthalate to make it react with the chloropropene in the tail gas. The reaction generates diallyl phthalate, which not only ensures the intrinsic safety of the process, but also generates diallyl phthalate with higher added value, while reducing VOC emissions. Background technique [0002] Both epichlorohydrin (ECH) and diallyl phthalate are important fine chemical products and organic intermediates with a ...

Claims

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Application Information

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IPC IPC(8): C07C67/11C07C69/80C07D301/12C07D303/08
Inventor 孙诚徐林丁克鸿王怡明曹亚丽李明吕丽
Owner JIANGSU YANGNONG CHEM GROUP
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