Process for the separation of hydrogen fluoride and of difluoromethane
AssigneeElf Atochem S.A.
InventorsJean-Michel Galland, Dominique Rouzies
Life of this patent
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Abstract
A process for the separation of hydrogen fluoride (HF) and of difluoromethane (F32) by fractional distillation and/or condensation, in at least one stage, including in at least one stage obtaining a stream whose HF and F32 contents correspond.
Claims9
Process for the separation of hydrogen fluoride (HF) and of difluoromethane (F32) by fractional distillation and/or condensation, in at least one stage, consisting essentially of at least one stage obtaining a stream whose HF and F32 contents correspond substantially to those of an azeotropic composition, the at least one stage being performed, as a function of the separation, at a pressure related so that the partial pressure of the HF+F32 mixture of the stream, Pa expressed in bars absolute, and the HF content of the mixture, x in per cent by weight, are linked by the relationship:
- Pa=17-22.9(x+0.821)ln(x+0.608)+56.6ln(x+0.608)!.sup.2 wherein the HF content of the HF-F32 azeotrope decreases when pressure increases.
Dependencies are inferred from the claim text.