A waste gas treatment method for a reaction process of preparing epoxy chloropropane from chloropropene

An epichlorohydrin and chloropropene technology, applied in the disproportionation separation/purification of halogenated hydrocarbons, organic chemistry, etc., can solve the problems of chloropropene loss, air pollution, etc. Effect

Inactive Publication Date: 2019-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using hydrogen peroxide as the oxygen source, the reaction-controlled phase transfer catalyst catalyzes the epoxidation of chloropropene to prepare epichlorohydrin. The tail gas generated during the reaction process contains nitrogen, chloropropene and oxygen. The direct discharge of the tail gas will cause the loss of chloropropene and the production of atmospheric Pollution, in order to make the production process green and environment-friendly, it is necessary to solve the loss of allyl chloride and pollute the atmosphere. Therefore, the present invention provides a method for treating waste gas in the process of preparing epichlorohydrin from allyl chloride

Method used

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  • A waste gas treatment method for a reaction process of preparing epoxy chloropropane from chloropropene
  • A waste gas treatment method for a reaction process of preparing epoxy chloropropane from chloropropene
  • A waste gas treatment method for a reaction process of preparing epoxy chloropropane from chloropropene

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Set the temperature of the tower bottom heat exchanger E1 to 10°C;

[0019] Set the temperature of the top condenser E2 heat exchanger to -15°C;

[0020] Set the pressure range of absorption tower T1 as: 100kPa,

[0021] The filling amount of epichlorohydrin in the tower bottom of the absorption tower T1 is set to be 50% of the volume of the tower bottom.

[0022] Using hydrogen peroxide as the oxygen source, the reaction-controlled phase transfer catalyst catalyzes the epoxidation of chloropropene to prepare epichlorohydrin. The results of waste gas treatment in the reaction process are shown in Table 1. It can be seen that the organic matter in the waste gas after this process is greatly reduced, reducing the The content of allyl chloride in the exhaust gas.

[0023] Table 1. Waste gas treatment results of the epoxidation of propylene chloride to prepare epichlorohydrin

[0024]

Embodiment 2

[0026] Set the temperature of the tower bottom heat exchanger E1 to 0°C;

[0027] Set the temperature of the top condenser E2 heat exchanger to -20°C;

[0028] Set the pressure range of absorption tower T1 as: 500kPa,

[0029] The filling amount of epichlorohydrin in the tower bottom of the absorption tower T1 is set to be 65% of the volume of the tower bottom.

[0030] Using hydrogen peroxide as the oxygen source, the reaction-controlled phase transfer catalyst catalyzes the epoxidation of chloropropene to prepare epichlorohydrin. The results of waste gas treatment in the reaction process are shown in Table 2. It can be seen that the organic matter in the waste gas after this process is greatly reduced, reducing the The content of allyl chloride in the exhaust gas.

[0031] Table 2. Waste gas treatment results of the epoxidation of propylene chloride to prepare epichlorohydrin

[0032]

Embodiment 3

[0034] Set the temperature of the tower bottom heat exchanger E1 to 15°C;

[0035] Set the temperature of the top condenser E2 heat exchanger to -10°C;

[0036] Set the pressure range of absorption tower T1 as: 300kPa,

[0037] The filling amount of epichlorohydrin in the tower bottom of the absorption tower T1 is set to be 45% of the volume of the tower bottom.

[0038] Using hydrogen peroxide as the oxygen source, the reaction-controlled phase transfer catalyst catalyzes the epoxidation of chloropropene to prepare epichlorohydrin. The results of waste gas treatment in the reaction process are shown in Table 3. It can be seen that the organic matter in the waste gas after this process is greatly reduced, reducing the The content of allyl chloride in the exhaust gas.

[0039] Table 3. Waste gas treatment results of the epoxidation of propylene chloride to prepare epichlorohydrin

[0040]

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Abstract

The invention provides a waste gas treatment method for a reaction process of preparing epoxy chloropropane from chloropropene. A reaction device includes a reaction tail gas buffer tank, an absorption column, a column bottom heat exchanger, a column top condenser and a column top gas phase buffer tank. Waste gas generated in the process of preparing epoxy chloropropane through chloropropene epoxidation reaction by adopting a reaction control phase transfer catalyst and adopting hydrogen peroxide as an oxidizing agent is subjected to condensation absorption treatment, and chloropropene in therecycled waste gas reaches the emission standard.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method for treating waste gas in the reaction process of preparing epichlorohydrin from allyl chloride. Background technique [0002] Epichlorohydrin (Epichlorohydrin, ECH) is an important basic chemical raw material, mainly used in the production of epoxy resin, epichlorohydrin rubber, glycerin, and surfactants, medicines, pesticides, coatings, ion exchange resins, plasticizers and other products, industrial production methods mainly include chlorohydrin method and allyl alcohol method. [0003] In recent years, reaction-controlled phase transfer catalysts have made great progress in the epoxidation of olefins, which are widely used in propylene, chloropropene, butene, isobutylene, styrene, 1-octene, cyclohexene, cyclohexene, In the epoxidation of olefins such as octene and 1-dodecene [Li Jun, Gao Shuang, Xi Zuwei. Progress in research on reaction-controlled ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C17/38C07C21/067
Inventor 高爽张毅吕迎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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