Method For Producing High Purity Boron Trifluoride

Abstract: The present invention relates to a method for producing gaseous boron trifluoride comprising the steps of: a) providing a composition A comprising boron trifluoride (BF3) and one or more volatile additional compounds F1; b) to a reactor containing sulphuric acid, adding a solution B comprising oleum and one or more volatile additional compounds F2 to form a mixture C of sulphuric acid having a titer greater than 100%, advantageously greater than 101%, preferably greater than 102%, more preferably greater than 105%, particularly greater than 110%, more particularly greater than 114%; c) adding the composition A to the mixture C to form a liquid phase L1 comprising the oleum, the sulphuric acid and the boron trifluoride and a gaseous phase G1 comprising the one or more volatile additional compounds F1 and F2; d) vacuumising the reactor to a pressure P1 between the vapour pressure of the sulphuric acid at the implementation temperature of step d) and the implementation pressure of step c) to remove the gaseous phase G1 comprising the one or more volatile additional compounds F1 and F2 from the reactor; e) adding a solution D containing water, or hydrates of BF3, or an aqueous solution of BF3, to the liquid phase L1 to produce a gaseous stream E of boron trifluoride. The present invention also relates to a composition comprising more than 99.99 wt% of boron trifluoride.

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