Continuous industrial production method of high-purity bisphenol A-bis (diphenyl phosphate)

Abstract

The invention discloses a continuous industrial production method of high-purity bisphenol A bis (diphenyl phosphate). The method comprises the following steps: dividing bisphenol A into two parts, mixing part of bisphenol A with phosphorus oxychloride and a Lewis acid catalyst, adding the mixture into a continuous multistage crosslinking reactor, reacting, and evaporating to remove excessive phosphorus oxychloride after the reaction is ended, adding an organic alkali acid-binding agent into the distillation residual liquid to react with the residual bisphenol A for 1.5-3 hours at the temperature of 115-120 DEG C to obtain an intermediate product reaction liquid, mixing the intermediate product reaction liquid with phenol, feeding the mixture into a multi-stage esterification reactor for esterification reaction, continuously supplying consumed phenol in the esterification process, and obtaining a crude product after the reaction is finished; and sequentially carrying out continuous acid washing, continuous alkali washing, continuous water washing, continuous solvent recovery and filtration to obtain the bisphenol A-bis (diphenyl phosphate) finished product. According to the method,the production cost is reduced, the product yield is increased to 97% or above, the product color number is increased to 50 or below, TPP is controlled to be 0.1%, isopropenyl phenyl diphenyl phosphate is smaller than 50 ppm, and fluctuation of quality indexes of all products is small.

Description

technical field [0001] The invention belongs to the technical field of chemical synthesis, and in particular relates to a continuous industrial production method of high-purity bisphenol A-bis(diphenyl phosphate). Background technique [0002] The molecular formula of bisphenol A-bis(diphenyl phosphate) (BDP for short) is C 39 h 34 o 8 P 2 , the molecular weight is 692, and its structural formula is as follows: [0003] , [0004] Bisphenol A-bis(diphenyl phosphate) is an oligomeric non-halogenated flame retardant and also a good plasticizer, mainly used in thermoplastic engineering plastics such as PC, ABS, PC / ABS, PPO / Epoxy resin and its polymers for HIPS rigid circuit board, its flame retardant performance is much better than traditional flame retardants such as alkyl phenyl phosphate. With the widespread popularization of new energy vehicles in recent years, the demand for bisphenol A-bis(diphenyl phosphate) has increased significantly, and the market is in shor...

AI Technical Summary

Problems solved by technology

Usually, BDP produced by this industrial method usually contains about 1-3% of triphenyl phosphate TPP and about 1% of isopropenylbenzenediphenyl ester. These two substances are harmful substances, and isopropyl is unstable. Phenomenon, the existence of isopropenyl group makes the color of the product darken when it is exposed to light, and the existence of TPP will cause defects, pollution and corrosion of the molded product. After entering the material, it is prone to volatilization, seepage and other problems, which will affect the resistance of the product. Flammability and other physical properties

[0007] The existing production methods of bisphenol A-bis(diphenyl phosphate) are mostly based on batch synthesis reaction. The batch reaction has a long time period and requires a large number of workers. The phenomenon of bubbling, dripping and leaking in chemical plants is very serious. The operating environment is very poor, which will endanger human health, sometimes life-threatening, not only high energy consumption, but also low production yield

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