Preparation method of high-content 4, 4 minute-isomer bisphenol F

Abstract

The invention discloses a preparation method of high-content 4, 4 minute-isomer bisphenol F. The preparation method comprises the following steps of (1) the catalysis and aqueous solution characteristics of water-soluble acid imidazole salt ionic liquids are utilized to catalyze phenol and formaldehyde to compound the bisphenol F under the condition of keeping appropriate water volume, low phenol and formaldehyde mole ratio sum, and lower reaction temperature, and a compound reaction effect of the high-content 4, 4 minute-isomer bisphenol F is obtained; (2) an ionic liquid catalyst water phase can be directly separated, recovered and reused through adding ethyl acetate, stirring, mixing, standing and layering, so that the corrosivity on equipment is obviously reduced; (3) the reaction batch charging phenol and formaldehyde mole ratio is low, and the recovered phenol amount, the operation cost and the environment pressure are obviously reduced; (4) the ethyl acetate is low in boiling point so as to be convenient to evaporate and recover; (5) the whole preparation process is low in operation cost, low in corrosivity, high in material utilization, green and environmental-friendly.

Description

technical field [0001] The invention relates to a preparation method of bisphenol F with high 4,4'-isomer content, which belongs to the field of organic catalytic synthesis. Background technique [0002] Bisphenol F has three isomers, 4,4'-, 2,4'-, and 2,2'-, and is usually synthesized by acid-catalyzed phenol and formaldehyde. When the content of 4,4'-isomer in bisphenol F is high, it is beneficial to the curing of functional groups to form a linear network structure, with low viscosity and good fluidity. No diluent added. At present, it has been reported that in the methods for synthesizing bisphenol F, the content of 4,4'-isomer bisphenol F in the synthetic product (referring to mass percentage, the same below) is mostly in the range of 42% to 55%. Patent CN101440022A reports that the 4,4'-isomer bisphenol F content is 49.5% in the phosphoric acid catalysis method, and the patent US43384706 reports that the 4,4'-isomer bisphenol F content is 55% in the phosphoric acid c...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of high-efficient green preparation method of bisphenol F with high 4,4'-isomer content, to solve the 4,4'-isomer content in existing phenol, formaldehyde synthesis bisphenol F product Not high, high molar ratio of phenol to formaldehyde, synthetic products need to be separated and purified by organic solvents, inorganic acid catalysts are highly corrosive, difficult to separate and recover, etc.