Process for preparing boron trifluoride monoethylamine complex

摘要

The present invention provides a process for preparing a boron trifluoride monoethylamine complex comprising the following steps: Mixing monoethylamine with chloromethane to obtain a monoethylamine solution; and adding boron trifluoride to the monoethylamine solution to effect a complexation reaction of boron trifluoride with the monoethylamine to obtain the boron trifluoride monoethylamine complex. According to the production method provided by the present invention, incorporation of the boron trifluoride diethyl etherate complex is avoided, and a selected solvent does not participate in the reaction of any raw materials, no new impurity is generated, and the resulting product has a high purity; and moreover, in the present invention, a mixed solution of chloroform and acetone is used for washing the product, the mixed solution of chloroform and acetone selectively removing other amine complexes other than the boron trifluoride monoethylamine complex, and the final product is a white crystalline powder a melting point of 95-115 ° C and a purity exceeding 99.5%, and the product is substantially non-hygroscopic when exposed to air.