Synthesis method of hexafluoroisobutene

Abstract

The invention discloses a synthesis method of hexafluoroisobutene. The synthesis method comprises the following steps of 1, making heptafluoroisobutenyl methyl ether react with borohydride in an I type solvent, conducting filtering and rectification after the reaction finishes to obtain hexafluoroisobutenyl methyl ether; 2, making hexafluoroisobutenyl methyl ether obtained in the step 1 react with acid, and conducting rectification after the reaction finishes to obtain hexafluoroisobutyraldehyde; 3, under the action of a catalyst, leading hydrogen into hexafluoroisobutyraldehyde obtained in the step 2 for a reaction, and conducting filtering after the reaction finishes to obtain hexafluoroisobutanol; 4, making hexafluoroisobutanol obtained in the step 3 react with alkali in an II type solvent, and collecting and rectifying the reaction product to obtain the hexafluoroisobutene product. The synthesis method of hexafluoroisobutene has the advantages of being simple in technology, high in yield, easy to operate and low in cost.

Description

technical field [0001] The invention relates to a synthesis method of hexafluoroisobutene, which belongs to the field of organic synthesis. Background technique [0002] Hexafluoroisobutene [3,3,3-trifluoro-2-(trifluoromethyl)-1-propene, referred to as HFIB], colorless, transparent liquid, CAS382-10-5, molecular weight 164.05, boiling point 14.5°C, critical Temperature 164°C, density 1.39g / ml, slightly soluble in water (0.23g / L, 23°C). [0003] Hexafluoroisobutene is a very useful chemical product and an important fluorine-containing special monomer in the development of new fluorine-containing polymers. It has a wide range of uses, such as the preparation of piezoelectric materials, lubricating materials, special elastomers, fluorine coatings, Semiconductor lithography materials, refrigerants, pharmaceutical intermediates, etc., new application fields are being discovered constantly, attracting more and more attention from people, and their preparation process has attracte...

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Problems solved by technology

[0003] Hexafluoroisobutene is a very useful chemical product and an important fluorine-containing special monomer in the development of new fluorine-containing polymers. It has a wide range of uses, such as the preparation of piezoelectric materials, lubricating materials, special elastomers, fluorine coatings, Semiconductor lithography materials, refrigerants, pharmaceutical intermediates, etc., new application fields are being discovered constantly, attracting more and more attention from people, and their preparation process has attracted people's strong attention, and no related patents have been seen in China to report

But no matter which kind of all has its own problems, such as hexafluoropropylene raw material is cheap and easy to get, but the yield is low, it is not suitable for industrial production

The hexafluoroacetone method has a short process route and high yield, but anhydrous hexafluoroacetone and ketene are highly toxic and the reaction is generally carried out at high temperature, the process is difficult and costly, which is not conducive to industrialization

[0025] The above method also has defects such as long route, low yield, and difficult availability of raw materials, and is not suitable for large-scale production.

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