Azeotrope-like compositions of tetrafluoroethane, pentafluoropropane and methylbutane
AssigneeHoneywell International Inc.
InventorsMary C. Bogdan, Hang T. Pham, David J. Williams, Gary M. Knopeck, Rajiv R. Singh
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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 2-methylbutane that are environmentally desirable for use as refrigerants, aerosol propellants, metered dose inhalers, blowing agents for polymer foam, heat transfer media, and gaseous dielectrics.
Claims23
Azeotrope-like compositions consisting essentially of from about 1 to about 60 weight percent 2-methylbutane, from about 1 to about 60 weight percent HFC-245fa and from about 98 to about 10 weight percent 1,1,1,2-tetrafluoroethane, which compositions have a boiling point of −25.80° C.±4 at 14.57 psia.
A process for removing 2-methylbutane from 1,1,1,2-tetrafluoroethane which process comprises distilling a mixture of 1,1,1,2-tetrafluoroethane, HFC-245fa and 2-methylbutane to separate an azeotrope or azeotrope-like composition consisting essentially of 1,1,1,2-tetrafluoroethane, HFC-245fa, and 2-methylbutane from 1,1,1,2-tetrafluoroethane present in excess of the concentration of said azeotrope.
Dependencies are inferred from the claim text.