Synthesis method of diaryl hexafluoropropane compound

Abstract

The invention relates to a synthesis method of a diaryl hexafluoropropane compound, which comprises the following steps that: aromatics with one or more electron repulsive groups are mixed with anhydrous hydrogen fluoride in a reactor, and then hexafluoropropylene oxide is added into the reactor to be mixed and heated; after the reaction, the hydrogen fluoride is removed, the remained product is refined to obtain the diaryl hexafluoropropane compound; with the method, the isomerization of hexafluoropropylene oxide and the concentration reaction of aromatics are integrated into one process stage to be realized, so the process procedure of the synthesis is reduced, and the production cost and side product can be reduced.

Description

technical field The present invention relates to a kind of synthetic method of diaryl hexafluoropropane compound. Background technique Diaryl hexafluoropropane compounds refer to 2,2-diaryl substituted hexafluoropropane compounds, such as 2,2-diphenyl-hexafluoropropane, 2,2-bis(4-hydroxyphenyl)-hexafluoropropane Fluoropropane (commonly known as bisphenol AF or BPAF), 2,2-bis(3,4-dimethylphenyl)-hexafluoropropane (commonly known as 6FXY; or BoxAF), 2,2-bis(4-methylphenyl) base)-hexafluoropropane (commonly known as BTAF or BIS-T-AF). These compounds are very useful products in the special fluorine-containing chemical industry. For example, 2,2-bis(4-hydroxyphenyl)-hexafluoropropane is a vulcanizing agent for 26 types of fluorine rubber, and 2,2-bis( 3,4-Dimethylphenyl)-hexafluoropropane is the raw material for the synthesis of the main monomer 6FDA of fluorine-containing polyimide. The traditional synthesis method of this type of compound is to react specific aromatic hydr...

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Problems solved by technology

In addition, multiple devices such as reactors, water absorption devices, and rectification towers are involved in this process, and there is highly toxic anhydrous hexafluoroacetone in the middle process, which is likely to cause environmental and safety problems

In addition, the use of hexafluoroacetone trihydrate in the traditional synthesis brings three times the molar amount of water of the actual reaction raw material hexafluoroacetone into the reaction system, and the reaction itself needs to use anhydrous hydrogen fluoride as a reaction catalyst and dehydrating agent, which increases the The water content makes the actual reaction need to use more hydrogen fluoride than the theoretical condensation reaction itself, and the increase of water content in hydrogen fluoride will cause it to be more corrosive to the metal of the reactor, which will bring production safety problems

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