Trans-1,3-dichloropropene in situ inversion method to obtain cis-1,3-dichloropropene

A technology of dichloropropene and dichloroethylene, which is applied in the fields of organic chemistry methods, chemical instruments and methods, halogenated hydrocarbon preparation, etc., can solve the problems such as inability to synthesize propargyl alcohol, and achieves increased raw material utilization rate, reduced emission and efficiency high effect

Active Publication Date: 2021-09-24
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cis-1,3-dichloropropene is used to synthesize propynyl alcohol, trans-1,3-dichloropropene cannot synthesize propynyl alcohol

Method used

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  • Trans-1,3-dichloropropene in situ inversion method to obtain cis-1,3-dichloropropene
  • Trans-1,3-dichloropropene in situ inversion method to obtain cis-1,3-dichloropropene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) 250ml quartz-jacketed glass reaction kettle, adding concentration is 5wt% (percentage by weight concentration, the following examples are the same) methanol solution 100ml of trans-1,3-dichloroethene, add 0.1% photoaccelerator Anthracene N2 slightly bubbling;

[0024] (2) Add 0.1% photoaccelerator anthracene;

[0025] (3) Then start light irradiation: 40w, 310nm LED light irradiation, temperature control at 25 degrees, gas phase detection of cis-trans isomerization ratio. After 1.2 hours of light, the cis-trans isomerization ratio was 1:2, the reaction was stopped, and the reaction product was obtained.

Embodiment 2

[0027] (1) 250ml quartz-jacketed glass reaction kettle, add 100ml of methanol solution of 5% trans-1,3-dichloroethylene, N2 slightly bubbling;

[0028] (2) Add 0.1% photoaccelerator anthracene;

[0029] (3) Then start light irradiation: 40w, 310nm LED light irradiation, temperature control at 25 degrees, gas phase detection of cis-trans isomerization ratio. After 0.5h of light, the cis-trans isomerization ratio was 1:2, the reaction was stopped, and the reaction product was obtained.

Embodiment 3

[0031] (1) 250ml quartz-jacketed glass reactor, add 100ml of methanol solution of 5% trans-1,3-dichloroethene, N2 slight bubbling;

[0032] (2) Add 0.1% photoaccelerator anthracene;

[0033] (3) Then start light irradiation: 40w310nm LED light irradiation, temperature control at 50 degrees, gas phase detection of cis-trans isomerization ratio. After 1.2 hours of light irradiation, the cis-trans isomerization ratio was 1:1.5, the reaction was stopped, and the reaction product was obtained.

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Abstract

The invention discloses a method for obtaining cis-1,3-dichloropropene by in-situ inversion of trans-1,3-dichloropropene, which comprises the following steps: (1) preparing trans-1,3-dichloropropene as The raw material is to add trans-1,3-dichloropropene into an alcohol solvent to form an alcohol solution; (2) add a photoaccelerator to the alcohol solution; (3) irradiate the alcohol solution after adding the photoaccelerator to ultraviolet light , control the reaction temperature, and obtain cis-1,3 dichloropropene after the reaction. The conversion of trans-1,3-dichloropropene into cis-type 1,3-dichloropropene by the method of the invention has the advantages of low cost, environmental protection and high commercial value.

Description

technical field [0001] The invention relates to a method for obtaining cis-1,3-dichloropropene through in-situ inversion of trans-type 1,3-dichloropropene. Under the irradiation of ultraviolet light, the trans-1,3-dichloropropene dissociates into chlorine radicals and allyl chloride radicals, and the free radicals recombine to form a cis-trans 1,3-dichloropropene mixture. Background technique [0002] 1,3-Dichloropropene is a by-product in the production of epichlorohydrin. The 1,3-dichloropropene on the market contains cis-1,3-dichloropropene and trans-1,3-dichloropropene as a mixture of isomers. The difference between the boiling points of cis and trans isomers is small, and the energy consumption of rectification and separation is relatively large. Cis-1,3-dichloropropene is used to synthesize propynyl alcohol, and trans-1,3-dichloropropene cannot synthesize propynyl alcohol. Therefore, if the trans-1,3-dichloropropene that does not participate in the reaction can be c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/358C07C21/073
CPCC07B2200/09C07C17/358C07C21/073
Inventor 张华星杨志杰吕海霞蒋勇军
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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