Azeotrope-like composition of hexafluoropropane, hexafluoropropene and hydrogen fluoride
AssigneeHoneywell International Inc.
InventorsRyan Hulse, Hang T. Pham, Rajiv R. Singh, Hsueh S. Tung, Daniel C. Merkel, Konstantin A. Pokrovski
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Abstract
The present invention relates to an azeotropic or azeotrope-like mixture consisting essentially of 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene and hydrogen fluoride.
Claims11
A method for removing 1,1,1,2,3,3-hexafluoropropane from a mixture containing 1,1,1,2,3,3-hexafluoropropane and at least one impurity, comprising adding hydrogen fluoride and, optionally, hexafluoropropene to the mixture in an effective amount to form an azeotropic or azeotrope-like composition of 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene, and hydrogen fluoride, and separating the azeotropic composition from the impurity.
A method for isolating 1,1,1,2,3,3-hexafluoropropane from an azeotropic mixture containing 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene, and hydrogen fluoride, comprising
- extracting hydrogen fluoride from a solution containing an azeotrope of 1,1,1,2,3,3-hexafluoropropane, hexafluoropropene, and hydrogen fluoride by contacting the mixture with a solution selected from the group consisting of an HF solvent, an HF absorbent, a basic solution and combinations thereof;
- and
- separating 1,1,1,2,3,3-hexafluoropropane from a remaining solution of 1,1,1,2,3,3 hexafluoropropane and hexafluoropropene.
Dependencies are inferred from the claim text.