Preparation method of cresyl diphenyl phosphate

A technology of toluene phosphate and diphenyl ester, which is applied in chemical instruments and methods, compounds of group 5/15 elements of the periodic table, organic chemistry, etc., can solve problems such as fast reaction, and achieve sufficient production capacity, easy access, and experimental conditions Good results
CN110423249AInactive Publication Date: 2019-11-08ZHEJIANG WANSHENG
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG WANSHENG
Publication Date
2019-11-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of cresyl diphenyl phosphate. The method includes the steps of: 1) esterification reaction: mixing phosphorus oxychloride with a catalyst, then adding phenol dropwise, and at the end of the reaction, conducting reduced pressure distillation to obtain diphenoxy phosphoryl chloride; 2) reduced pressure reaction: reacting the intermediate diphenoxy phosphoryl chloride obtain in step 1) with m, p-cresol under a reduced pressure, and removing the reacted hydrogen chloride gas to obtain a cresyl diphenyl phosphate crude product; and 3) refining: carryingout alkali washing, washing and reduced pressure distillation on the cresyl diphenyl phosphate crude product obtained in step 2) to obtain cresyl diphenyl phosphate. Phosphorus oxychloride and phenolare employed for reaction to prepare the diphenoxy phosphoryl chloride intermediate, the generated intermediate reacts with m, p-cresol to prepare the product, the synthetic route reduces the impurities phenyl xylylphosphate, tricresyl phosphate and triphenyl phosphate, thus improving the purity.
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Description

technical field

[0001] The invention relates to the technical field of organic synthesis, in particular to a preparation method of toluene-diphenyl phosphate. Background technique

[0002] Cresyl-diphenyl phosphate (referred to as CDP flame retardant), can also be cresyl diphenyl phosphate, cresyl diphenyl phosphate or phenylmethylphenyl phosphate, the English name is Cresyl Diphenyl Phosphate, and the CAS registration number is 26444 -49-5 molecular formula: C 19 h 17 o 4 P, molecular weight: 340.31, its structural formula is as follows:

[0003]

[0004] Colorless or yellowish transparent liquid, melting point: -38°C boiling point: 235-255°C, density: 1.20, slightly phenolic smell; has good flame retardant and plasticizing properties, mainly used for PVC, VC copolymer, nitrocellulose , cellulose acetate, butyl acetate cellulose, natural and synthetic rubber, etc.

[0005] Currently about preparation methods such as:

[0006] The method disclosed in Chinese patent ...

Claims

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