Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane, methylbutane and water
AssigneeHoneywell International Inc.
InventorsMary C. Bogdan, Hang T. Pham, David J. Williams, Gary M. Knopeck, Rajiv R. Singh, Kane D. Cook
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Abstract
This invention provides azeotrope-like compositions of 1,1,1,2-tetrafluoroethane, 1,1,1,3,3-pentafluoropropane-245fa and water that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.
Claims24
An azeotrope-like composition consisting essentially of from about 1 to about 50 weight percent water, from about 1 to about 50 weight percent 2-methylbutane, from about 1 to about 50 weight percent HFC-245fa and from about 97 to about 10 weight percent 1,1,1,2-tetrafluoroethane, which compositions have a boiling point of −25.80° C.±4 at 14.61 psia.
A process for removing water from 1,1,1,2-tetrafluoroethane which process comprises distilling a mixture of 1,1,1,2-tetrafluoroethane, HFC-245fa, 2-methylbutane and water to separate an azeotrope or azeotrope-like composition consisting essentially of 1,1,1,2-tetrafluoroethane, HFC-245fa, 2-methylbutane and water from 1,1,1,2-tetrafluoroethane present in excess of the concentration of said azeotrope.
Dependencies are inferred from the claim text.