High-selectivity catalytic synthesis method for 4, 4'-bisphenol F

Abstract

The invention discloses a high-selectivity catalytic synthesis method for 4, 4'-bisphenol F. Ionic liquid N, N-bi(4-sulfydryl) butyl-N, N, N, N-tetramethyl-1, 3-propane diammonium sulfate hydrogen sesquisulfate is used as a catalyst; phenol and formaldehyde are used as raw materials; the 4, 4'-bisphenol F is obtained through high-selectivity catalytic synthesis via condensation reaction. The adopted ion liquid catalyst of N, N-bi(4- sulfydryl) butyl-N, N, N, N- tetramethyl-1, 3-propane diammonium sulfate hydrogen sesquisulfate uses N, N, N, N-tetramethyl-1, 3- propane diamine, 1, 4- dibromobutane and thiourea as raw materials; firstly, butyl bromide is introduced onto diamine through nucleophilic substitution reaction; then, isothiuronium salts are generated through the reaction between thiourea and butyl bromide; sodium hydroxide is used for hydrolyzing the isothiuronium salts to obtain hydrosulfuryl salts; dilute hydrochloric acid acidification is carried out to obtain hydrosulphonyl; finally, concentrated sulfuric acid is used for replacing negative ions into bisulfate ions. When the catalyst is used for bisphenol F catalytic synthesis, the selectivity of the 4, 4'-bisphenol F is greatly improved.

Description

technical field [0001] The invention relates to a method for catalytically synthesizing 4,4'-bisphenol F with high selectivity. Background technique [0002] Bisphenol F is a bisphenol compound produced by the condensation reaction of phenol and formaldehyde under the action of a catalyst. Its chemical name is dihydroxydiphenylmethane, and it has 4,4'-, 2,4'-, 2 , 2′-three isomers, wherein the isomer with the best performance is the para-position 4,4′-bisphenol F, and the chemical structural formulas of their three isomers are as follows: [0003] [0004] Bisphenol F is an important chemical intermediate. When synthesizing epoxy resin, polyester resin, polycarbon resin and phenolic resin, the heat and humidity resistance, insulation and processing injection molding performance of the obtained product are better than those of the previous products. Similar products made of bisphenol A as raw material have great development and application space. [0005] The catalysts f...

AI Technical Summary

Problems solved by technology

The catalytic yield of inorganic acid is high, but it is severely corrosive to equipment and has many side reactions; the catalytic reaction condition of organic acid is mild, and it is less corrosive to equipment, but it has many side reactions, high phenolic ratio and low yield

Patent JP11269113 and patent CN101987812A respectively reported the method of catalyzing the synthesis of bisphenol F by zeolite molecular sieve and mesoporous molecular sieve. This kind of method is convenient for catalyst separation and recovery, but the phenol-formaldehyde ratio and reaction temperature are high, and the catalyst is easy to block pores and deactivate

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