Method for preparing 2-chloroethylphosphonic acid bis(2-chloroethyl)ester

Abstract

The invention discloses a method for preparing 2-chloroethylphosphonic acid bis(2-chloroethyl)ester. The method comprises the following steps of: adding ethylene oxide into 2-chloroethylphosphonic dichloride, reacting at the temperature of between 0 and 100DEG C for 8 to 18 hours, and removing residual ethylene oxide under reduced pressure to obtain a target product. The yield is more than or equal to 97 percent, the purity is more than or equal to 97.5 percent, the quality of the product is stable, and the product has a good application prospect.

Description

technical field

[0001] The invention relates to a preparation method of 2-chloroethylphosphonic acid bis(2-chloroethyl). Background technique

[0002] 2-Chloroethylphosphonic acid bis (2-chloroethyl) ester is mainly used for the production and preparation of the plant growth regulator ethephon, and it can be used as a flame retardant itself for the preparation of the flame retardant vinylphosphonic acid di (2-Chloroethyl) ester intermediate. In addition, 2-chloroethylphosphonic acid bis (2-chloroethyl) ester can also be used in the preparation of pharmaceutical resins, ion exchange resins, and fungicides, etc., and has broad market development prospects.

[0003] In the prior art, 2-chloroethylphosphonic acid bis (2-chloroethyl) ester is mainly prepared by the reaction of phosphorus trichloride and ethylene oxide to obtain tris (2-chloroethyl) phosphite, the latter Rearrangement at high temperature is often divided into tank reaction with addition of solvent (o-dichloroben...

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