Method For Producing High Purity Boron Trifluoride

Abstract: The invention relates to a method for the continuous production of gaseous boron trifluoride, the method comprising the steps of: a) providing a composition A comprising boron trifluoride (BF3) and optionally one or more additional volatile compounds F1; b) continuously adding, to a first reactor R1: - a sulphuric acid solution and a solution B comprising oleum and volatile additional compounds F2 to form a solution C; - composition A; to form: - a liquid phase L1 comprising oleum, sulphuric acid and BF3 and - a gaseous phase G1 comprising the volatile additional compounds F1 and F2; c) continuously removing the gas phase G1 comprising the additional volatile compounds F1 and F2, preferably by means of negative pressure; d) continuously adding the liquid phase L1 to a second reactor R2 and continuously adding, to the reactor R2, a composition D1 of water or an aqueous composition of boron trifluoride D2 or a composition D3 comprising hydrated boron trifluoride, referred to as boron trifluoride hydrates, wherein the compositions D1 and D2 do not contain any additional compound F1 to produce a gaseous phase E of boron trifluoride and a liquid phase L2.

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