Preparation of pure boron trifluoride

Details Preparation of pure boron trifluoride Preparation of pure boron trifluoride

1988-02-05

1989-05-16

Stoll, Robert L.

Chemistry of inorganic compounds

Boron or compound thereof

Binary compound

423489, C01B 3506, C01B 908

Patent

active

048308420

ABSTRACT:
A multistage process for preparing pure BF.sub.3 from hexafluorosilicic acid, H.sub.2 SiF.sub.6, comprises reacting H.sub.2 SiF.sub.6 with oxygen acids of boron and/or boron oxide in the first stage to give hydroxyfluoroboric acid and silica, filtering off the silica and concentrating the hydroxyfluoroboric acid, adding oleum to the concentrate and then heating to form gaseous BF.sub.3.

REFERENCES:
patent: 2109340 (1938-02-01), Nieuwland et al.
patent: 2135454 (1938-11-01), McAlevy
patent: 2148514 (1939-02-01), Swinehart
patent: 2160576 (1939-05-01), Loder
patent: 2196907 (1940-04-01), Swinehart
patent: 2799559 (1957-07-01), Sullivan et al.
patent: 4528164 (1985-07-01), Cooper et al.

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