Method for recovering a gaseous boron trifluoride bf.sub.3 and t

Details Method for recovering a gaseous boron trifluoride bf.sub.3 and t Method for recovering a gaseous boron trifluoride bf.sub.3 and t

1991-12-20

1993-10-19

Pal, Asok

Chemistry of hydrocarbon compounds

Unsaturated compound synthesis

By addition of entire unsaturated molecules, e.g.,...

585800, C07C 222

Patent

active

052547841

ABSTRACT:
The invention relates to a method for removing a boron trifluoride from the exhaust gases of a vacuum pump, which gases have been obtained when polymerizing .alpha.-olefines by using a BF.sub.3 -alcohol complex as a catalyst. In a vacuum distillation, the underpressure is achieved by means of a pump sealed with a fluid ring or by means of fluid jet with a torque or ejector pump, possibly assisted by a mechanical blaster, such as a propellant circulating pump. In this pump, the fluid ring or the fluid jet is formed by a cocatalyst forming a complex with the BF.sub.3 catalyst, which cocatalyst is an alcohol, preferably butanol.

REFERENCES:
patent: 4263467 (1981-04-01), Madgarker et al.
patent: 4956512 (1990-09-01), Nissfolk et al.
patent: 4982042 (1991-01-01), Akatsu et al.

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