Preparation method of boron trifluoride dihydrate

Abstract

The invention concretely relates to a preparation method of a boron trifluoride dihydrate. The preparation method comprises the following steps of firstly, adding deionized water into a reactor, and carrying out cooling treatment outside the reactor; and secondly, introducing boron trifluoride to the deionized water in the reactor, and enabling boron trifluoride and the deionized water to be subjected to complex reaction to prepare the boron trifluoride dihydrate. Compared with the prior art, the preparation method of the boron trifluoride dihydrate, provided by the invention, has the advantages that a boron trifluoride complex, namely the boron trifluoride dehydrate, prepared by complex reaction of water vapor and boron trifluoride gases by taking the deionized water as a medium, is low in cost and environment-friendly because no organic solvents are used; and the complex reaction is carried out at normal temperature or slightly high temperature, and therefore, the reaction is mild, and the reaction condition is more easily controlled and is safer.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a preparation method of a boron trifluoride complex. Background technique [0002] Boron trifluoride complex is an important industrial raw material and can be used as various catalysts. In the prior art, the preparation method of boron trifluoride complex is to use boron trifluoride and organic solvent steam, such as diethyl ether, tetrahydrofuran steam to carry out complex reaction. Wherein, the reaction equation of the ether complex is: BF 3 +O(CH 2 ) 4 →BF 3 ·O(CH 2 ) 4 ; The reaction equation of tetrahydrofuran complex is: BF 3 +O(CH 2 CH 3 ) 2 →BF 3 ·O(CH 2 CH 3 ) 2 . [0003] For example, in the prior invention patent whose application publication number is "CN102911195A" and whose patent name is "Method for preparing boron trifluoride tetrahydrofuran", tetrahydrofuran steam is used to prepare boron trifluoride complex. In the above-mentioned patent, the ...

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Problems solved by technology

In the above patents, the reaction is exothermic, the temperature is difficult to control, and ether organic solvents such as tetrahydrofuran are prone to produce peroxides and have a low boiling point. They are flammable and explosive products, and there are certain safety hazards in the industrial production process.