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The method for preparing 1,3-dichloropropene by chlorination of 1-chloropropene

A technology of dichloropropene and chloropropene, which is applied in the field of chlorination of 1-chloropropene to prepare 1, which can solve the problems of complex process, low purity and yield

Active Publication Date: 2021-05-14
滨州市沾化区鑫骏化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the related art, it is generally separated from the by-products of allyl chloride produced by high-temperature chlorination of propylene, or it is prepared by dehydrochlorination of 1,2,3-trichloropropane under the action of alkali, the purity and yield are all low, and Complex process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to 1200h -1 Continuously feed nitrogen into the fixed-bed reactor at a space velocity of 1-chloropropene; place it in the fixed-bed reactor at a speed of 1.5ml / min after vaporizing 1-chloropropene; heat the fixed-bed reactor to stabilize at 350°C; Chlorine gas is passed through the medium, and 1-chloropropene and chlorine gas undergo a chlorination reaction to generate 1,3-dichloropropene. The reaction product is detected by gas chromatography, and the conversion rate can reach 87.0%, and the selectivity is 99.5%.

Embodiment 2

[0029] According to 1000h -1 Continuously feed nitrogen into the fixed-bed reactor at a space velocity of 1-chloropropene; place it in the fixed-bed reactor at a speed of 1.5ml / min after vaporizing 1-chloropropene; heat the fixed-bed reactor to stabilize at 350°C; Chlorine gas is passed through the medium, and 1-chloropropene and chlorine gas undergo a chlorination reaction to generate 1,3-dichloropropene. The reaction product is detected by gas chromatography, and the conversion rate is 86.5%, and the selectivity is 99.2%.

Embodiment 3

[0031] According to 1000h -1 Continuously feed nitrogen into the fixed-bed reactor at the space velocity of 1-chloropropene; place it in the fixed-bed reactor at a speed of 1.5ml / min after vaporizing 1-chloropropene; heat the fixed-bed reactor to stabilize at 320°C; Chlorine gas is passed through the medium, and 1-chloropropene and chlorine gas undergo a chlorination reaction to generate 1,3-dichloropropene. The reaction product is detected by gas chromatography, and the conversion rate is 85.7%, and the selectivity is 99.6%.

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PUM

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Abstract

The invention provides a method for preparing 1,3-dichloropropene by chlorination of 1-propene chloride, comprising: continuously feeding nitrogen into a fixed-bed reactor according to a preset space velocity; The feed rate is placed in the fixed-bed reactor; the fixed-bed reactor is heated and stabilized at a preset temperature; chlorine gas is introduced into the fixed-bed reactor, and 1-chloropropene and chlorine undergo a chlorination reaction to generate 1,3-dichloropropene . Through the technical scheme of the present invention, the safety performance is high, the process is simple, the purity and yield of the generated 1,3-dichloropropene are high, and the conversion rate and selectivity are high, which is suitable for popularization and production application.

Description

technical field [0001] The invention relates to the technical field of chemical product preparation, in particular to a method for preparing 1,3-dichloropropene by chlorination of 1-chloropropene. Background technique [0002] 1,3-Dichloropropene can be mixed with chloropicrin as a soil fumigant, and can also be used as a chemical reagent and solvent to treat the soil before planting crops, and can prevent and control root-knot nematodes, short-body nematodes, and cysts of various crops. The nematode lamp nematode and underground pests can also be used in organic synthesis, as an antifungal agent, and as a pharmaceutical intermediate. [0003] However, in the related art, it is generally separated from the by-products of allyl chloride produced by high-temperature chlorination of propylene, or it is prepared by dehydrochlorination of 1,2,3-trichloropropane under the action of alkali, the purity and yield are all low, and The process is complex. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/10C07C21/073
CPCC07C17/10C07C21/073
Inventor 张建肖宋朋斌薄纯金张延军
Owner 滨州市沾化区鑫骏化工有限公司