Method for catalyzed synthesis of bisphenol F by using modified hydroxyapatite

Abstract

The invention discloses a method for the catalyzed synthesis of bisphenol F by using modified hydroxyapatite. The method is implemented by taking phenol and formaldehyde as raw materials and taking modified hydroxyapatite as a catalyst through a step of carrying out a condensation reaction on the raw materials and the catalyst so as to obtain bisphenol F. The adopted catalyst is prepared by carrying out load modification by taking hydroxyapatite subjected to preliminary pretreatment as a carrier and taking any one or more of aluminium chloride, zinc chloride, copper chloride, titanium tetrachloride or ferric chloride as modifiers. The adopted catalyst is cheap and easy to obtain, the catalyst is good in dispersibility, high in catalytic efficiency, easy to separate and reusable in the reaction, and overcomes the defects of too high by-products, strong corrosivity, and the like in the process of synthesizing bisphenol F by using other catalysts; and in the process of reaction, other organic solvents are not required to be added, therefore, the method conforms to the principle of green economy.

Description

technical field [0001] The invention relates to a preparation method of bisphenol F. Background technique [0002] Bisphenol F, whose chemical name is dihydroxydiphenylmethane, is suitable for the preparation of low-viscosity epoxy resin due to its chemical structure. All are better than bisphenol A epoxy resin, especially because it is easy to flow in injection molding and can add less or even no diluent. It is especially suitable for the processing and molding of epoxy resin for large wind turbine blades. processing environment. [0003] The reported prior art is to use phenol and formaldehyde as raw materials to catalyze the synthesis of bisphenol F. The difference lies in the difference of the catalysts used. Generally, there are inorganic acids, organic acids, molecular sieves, ion exchange resins, ionic liquids and heteropolyacids. catalytic method. [0004] Patent US4400554 reports a synthesis method using phosphoric acid as a catalyst, the phenol-formaldehyde rati...

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Problems solved by technology

[0009] The currently reported methods for synthesizing bisphenol F generally have problems such as high phenol-formaldehyde ratio, low yield and selectivity, many by-products, long reaction time, strong corrosion, difficult separation of catalysts, and low recycling rate, which lead to the problems of bisphenol F The production cost of F is too high, which affects the large-scale application of the product