Continuous preparation method of high-purity perfluoro-2, 4-dimethyl-3-heptene

A dimethyl, high-purity technology, applied in the field of continuous microchannel preparation of high-purity hexafluoropropylene trimer, can solve the problems that the overall yield is only 50.7%, and it is difficult to realize continuous industrial production, so as to improve selectivity , The effect of improving product yield
CN113548937AActive Publication Date: 2021-10-26ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG LANTIAN ENVIRONMENTAL PROTECTION HI TECH
Publication Date
2021-10-26

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Abstract

The invention discloses a continuous preparation method of high-purity perfluoro-2, 4-dimethyl-3-heptene. The preparation method comprises the following step: in a micro-channel reactor, hexafluoropropylene and a liquid phase catalyst preheated by a preheating module react at 70-140 DEG C to obtain the perfluoro-2, 4-dimethyl-3-heptene. the liquid-phase catalyst is prepared from a component A, a component B, a component C and a component D, the component A is selected from at least one of potassium fluoride, cesium fluoride and potassium bifluoride; the component B is selected from at least one of crown ether, cyclodextrin, polyethylene glycol, calixarene or pillararene; the component C is an amide compound; and the component D is selected from at least one of perfluoro-4-methyl-2-pentene, perfluoro-2-methyl-2-pentene and perfluoro-2-ethyl-3, 3-dimethyl ethylene oxide. The method has the advantages of accurate temperature control, good selectivity, high product purity and the like.
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Description

technical field

[0001] The invention relates to the field of fluorine-containing intermediates, in particular to a microchannel continuous preparation method of high-purity hexafluoropropylene trimer. Background technique

[0002] Hexafluoropropylene trimer is an important fluorine-containing organic intermediate, which can be used in the preparation of fluorine-containing surfactants for detergent, textile, leather and other fields, and can also be used as a reaction solvent and heat transfer medium. At present, the trimer of hexafluoropropylene is mainly obtained by telomerization of hexafluoropropylene through liquid phase method or gas phase method, but the trimer obtained by telomerization is mostly perfluoro-2,4-dimethyl-3-heptene, A mixture of perfluoro-2,4-dimethyl-3-ethyl-2-pentene and perfluoro-4-methyl-3-isopropyl-2-pentene, since the three are isomers solid, with similar boiling points, it is difficult to separate.

[0003] U.S. Patent No. 4,296,265A discloses ...

Claims

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