Environmentally-friendly synthesis method of bisphenol fluorene

Abstract

The invention discloses an environmentally-friendly synthesis method of bisphenol fluorine. The method comprises the following steps: adding phenol, 9-fluorenone, 3-thiohydracrylic acid and an immobilized ionic liquid catalyst into an ultrasonic reaction kettle at 150 to 400 w, and placing the reaction kettle into a water bath at 25 to 50 DEG C for reaction for 1 to 3 h; collecting the immobilizedionic liquid catalyst through a magnetic field, and washing and drying the collected immobilized ionic liquid catalyst for repeated use; washing the residual reaction liquid without the immobilized ionic liquid catalyst with boiled water to separate out crystals, performing suction filtration and vacuum drying on the crystals to obtain a bisphenol fluorine coarse product, and recrystalizing the bisphenol fluorine coarse product to obtain white bisphenol fluorine crystals. Compared with a conventional preparation catalyst of the bisphenol fluorine, the catalyst disclosed by the invention has the advantages of high reaction cavity and high selectivity; furthermore, reaction conditions are mild, and the reaction efficiency is high; and in addition, the quality of the bisphenol fluorine is obviously improved.

Description

technical field [0001] The technical field of catalysis of the present invention relates to a catalytic preparation method of bisphenol fluorene, in particular to a green synthesis method for preparing bisphenol fluorene by using ionic liquid. Background technique [0002] Bisphenol fluorene is an important class of fine chemical raw materials, widely used, mainly used in the synthesis of a variety of new polymer materials. Bisphenol fluorene is a bisphenol compound with a skeleton structure obtained by condensation reaction of fluorenone and phenol as raw materials in the presence of an acidic catalyst. According to the different catalysts used, the methods for preparing bisphenol fluorene in the prior art mainly include sulfuric acid method, hydrogen chloride method, mercaptosulfonic acid method and heteropolyacid method. [0003] The sulfuric acid method is the most conventional method for synthesizing bisphenol fluorene, which has the advantages of simple synthesis proc...

AI Technical Summary

Problems solved by technology

However, the disadvantages of this process are that the catalyst is seriously corrosive to metal equipment; the amount of acid is large and it is not easy to recycle; the product produces a large amount of wastewater containing phenol, sulfuric acid and methanol in the post-treatment process, which is difficult to treat

The advantage of the hydrogen chloride method is that the reaction conditions are mild, the operation is simple, the raw material is cheap, and it is suitable for large-scale production.

The mercaptosulfonic acid method can effectively avoid the problem of equipment corrosion caused by inorganic acid catalysts in the synthesis project, and can produce bisphenol fluorene with high efficiency in a short period of time; the advantage of this method is that the process requirements are low and the product quality is good , higher yield, less environmental pollution, the disadvantage is that mercaptosulfonic acid catalysts are expensive and not suitable for large-scale production

The quality of the product obtained by the heteropoly acid method is good and has little impact on the environment, but the reaction conditions are harsh, the catalyst is easily deactivated, the production energy consumption is large, the product yield is low, and the equipment maintenance is expensive.

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