Preparation method of bisphenol F

Abstract

The invention discloses a preparation method of bisphenol F. The preparation method comprises the following steps that a fixed-bed tubular reactor is provide with a separation plate in the axial direction to divide the reactor into three parts, two sides of the separation plate are an upper feeding section and a discharging section, and the lower part of the separation plate is a lower feeding section; an aqueous solution of phenol and an aqueous solution of formaldehyde are fed as feed I from a raw material inlet of the upper feeding section into the reactor, and the aqueous solution of phenol and nitrogen are fed into the reactor as feed II from a raw material inlet of the lower feeding section; the feed I is subjected to a condensation reaction in a catalyst bed in the middle part of the reactor, the reacted materials are mixed with the bottom-up feed II for further reaction, and a reaction product is discharged from a discharging port of the discharging section, then separated andpurified to obtain the bisphenol F. The preparation method uses phenol and formaldehyde as raw materials, the reactor adopts the fixed-bed tubular reactor with the separation plate in the middle, andthe feeding mode adopts a method of upper and lower feeding simultaneously. The preparation method of the bisphenol F is simple in process, high in efficiency and mild in conditions, catalyst activityis stable and long-term operation can be achieved.

Description

technical field [0001] The invention relates to a method for preparing bisphenol F, in particular to a method for preparing bisphenol F by using phenol and formaldehyde as raw materials. Background technique [0002] Bisphenol F, also known as bis-(hydroxyphenyl)methane, molecular formula C13H12O2, melting point 160 ° C, ultraviolet light can cause discoloration, it is a white leaf-shaped crystal. It is a monomer for synthetic materials, mainly used in the synthesis of epoxy resins, and can also be used in the synthesis of polycarbonate resins, polyester resins and phenolic resins, flame retardants, antioxidants and surfactants. Epoxy resin is the matrix material of high-performance composite materials. It has various types and excellent performance. It has good adhesion, insulation, chemical stability and thermal stability. It is easy to cure and has a wide range of uses. At present, common epoxy resins mainly include glycidyl ether resins—bisphenol A epoxy resins. As a m...

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Problems solved by technology

[0005] CN104326878A discloses a method for catalytically synthesizing bisphenol F with nitric acid and phosphoric acid. This method uses nitric acid and phosphoric acid as catalysts, and uses an organic solvent to participate in the synthesis reaction. There are problems of corrosion, pollution and difficult separation

CN102584541A discloses a method for preparing bisphenol F with 1-alkyl-3-methylimidazole acidic ionic liquid. The method uses an ionic liquid catalyst. Although there are no problems such as corrosion and pollution, the catalyst needs to be recycled and energy consumption is high. Higher, and the catalyst life is short, and the product yield in the later stage of use is low

JP11269113 discloses a method for synthesizing bisphenol F using zeolite molecular sieves as a catalyst; CN 101987812A discloses a method for synthesizing bisphenol F using mesoporous molecular sieves as a catalyst. This type of method product separation and catalyst recovery are relatively easy, but the phenol-formaldehyde ratio and The reaction temperature is high, the reaction is difficult to control, and there are many side reactions

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