Preparation of boron trichloride

Details Preparation of boron trichloride Preparation of boron trichloride

1979-03-26

1980-07-01

Peters, G. O.

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

C01B 3506

Patent

active

042106311

ABSTRACT:
Boron trichloride is prepared in substantially stoichiometric quantities by free-radical chlorination of borate ester, e.g., trimethyl borate, at temperatures of between about 20.degree. C. and 100.degree. C., more preferably between about 40.degree. C. and about 90.degree. C. The mole ratio of chlorine to borate ester is from about 5.5:1 to about 7.5:1. Reactor pressures are moderate, e.g., generally less than 3 atmospheres absolute. Atmospheric pressure can be used. An inert liquid organic solvent, e.g., carbon tetrachloride, can be used as the reaction medium. Gaseous reaction products are removed from the reactor during the chlorination reaction. In addition to boron trichloride, carbon monoxide (rather than phosgene) and hydrogen chloride are the principal products of the chlorination reaction. Phosgene is produced in substantially lower amounts than when chlorination is conducted at autogeneous pressures and the chlorine:trimethyl borate mole ratio is 9:1 or more. The boron trichloride product is separated from the carbon monoxide, hydrogen chloride and phosgene products, and recovered.

REFERENCES:
patent: 2943916 (1960-07-01), McElroy
Gerrard, Wm., The Organic Chemistry of Boron; Academic Press, N.Y., 1961: pp. 13-15.

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