Method for preparing halogenated five-membered cycloolefin by gas phase isomerization reaction

A technology of isomerization and five-membered ring, which is applied in the field of gas-phase isomerization reaction to prepare halogenated five-membered ring olefins, and can solve environmental pollution, harsh technology of trichloropentafluorocyclopentene isomer and difficult to control. and other problems, to achieve the effect of easy availability of raw materials and cheap isomerization catalysts
CN107445794BActive Publication Date: 2020-12-04BEIJING YUJI SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING YUJI SCI & TECH
Publication Date
2020-12-04

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Abstract

The invention relates to a method for preparing halogenated pentacyclic olefin by gas-phase isomerization reaction. The method comprises the following steps of: by adopting the halogenated pentacyclic olefin C5HxFyClz as a material, under the existence of an isomerization catalyst, generating the gas-phase isomerization reaction to obtain isomers of the halogenated pentacyclic olefin, wherein X is an integer from 0 to 2, Y is an integer from 4 to 7, Z is an integer from 0 to 4, the sum of X and Y and Z is 8, and the isomerization catalyst is prepared by adopting at least one of lithium fluoride, potassium fluoride, sodium fluoride, rubidium fluoride or cesium fluoride as an active component and loading the active component on at least one of carriers such as aluminium fluoride, magnesium fluoride, iron fluoride, chromium fluoride and zinc fluoride. The method has the advantages that the material is easy to obtain, the isomerization catalyst is low in price, the yield of the isomer is higher, and the method is applicable to large-scale preparation of the isomers of the halogenated pentacyclic olefin by gas-phase reaction.
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Description

technical field

[0001] The present invention relates to a method for preparing halogenated five-membered ring olefins by gas-phase isomerization, in particular to a method for obtaining halogenated five-membered rings through isomerization reaction of halogenated five-membered rings under the catalysis of an isomerization catalyst Process for the preparation of isomers of olefins. Background technique

[0002] Halogenated five-membered cyclic olefins are extremely important chemical raw materials or intermediates. For example, 1,2-dichlorohexafluorocyclopentene, hexachlorocyclopentadiene, etc. are important fluorine-containing building blocks. Therefore, the synthesis of halogenated five-membered cycloalkenes has become one of the research focuses in the field of fluorine chemistry.

[0003] The literature [Chemische Berichte; vol.117; nb.3; (1984); p.1153-1160] reported that 1,2,3,4,5-pentachloropentafluorocyclopentane was used as raw material, and Na-Ag- Hg alloy reacti...

Claims

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