Azeotrope-like compositions of pentafluoropropene and 1,1,1,2,2-pentafluoropropane

A method for modifying a refrigeration apparatus which refrigeration apparatus comprises a refrigerant, which refrigerant comprises a combination of a chlorofluorocarbon or a hydrochlorofluorocarbon and a mineral oil, comprising removing at least a portion of the chlorofluorocarbon or hydrochlorofluorocarbon from the refrigerant and leaving a residue comprising the mineral oil, and adding to said residue an azeotrope-like composition comprising a first component comprising 1,1,1,2,2-pentafluoropropane and a second component which comprises either the Z isomer of 1,1,1,2,3-pentafluoropropene or a mixture of the E isomer of 1,1,1,2,3-pentafluoropropene and the Z isomer of 1,1,1,2,3-pentafluoropropene.

A process for separating a first component comprising 1,1,1,2,2-pentafluoropropane from an azeotrope-like composition of 1,1,1,2,2-pentafluoropropane and a second component which comprises either the Z-isomer of 1,1,1,2,3-pentafluoropropene or a mixture of the E isomer of 1,1,1,2,3-pentafluoropropene and the Z isomer of 1,1,1,2,3-pentafluoropropene comprising the steps of (A) distilling a composition comprising an azeotrope-like composition of a first component comprising 1,1,1,2,2-pentafluoropropane and a second component which comprises either the Z-isomer of 1,1,1,2,3-pentafluoropropene or a mixture of the E isomer of 1,1,1,2,3-pentafluoropropene and the Z isomer of 1,1,1,2,3-pentafluoropropene at a first pressure to produce a first overhead stream enriched in either the first component comprising 1,1,1,2,2-pentafluoropropane or the second component which comprises Z-isomer of 1,1,1,2,3-pentafluoropropene or a mixture of the E isomer of 1,1,1,2,3-pentafluoropropene and the Z isomer of 1,1,1,2,3-pentafluoropropene and a first bottoms stream enriched in the other component;

• and (B) redistilling the first overhead stream at a second pressure to produce a second overhead stream enriched in the component enriched in the first bottoms stream and a second bottoms stream enriched in the component enriched in the first overhead stream.

A process for separating a first component comprising 1,1,1,2,2-pentafluoropropane from an azeotrope-like composition of 1,1,1,2,2-pentafluoropropane and a second component which comprises either the Z-isomer of 1,1,1,2,3-pentafluoropropene or a mixture of the E isomer of 1,1,1,2,3-pentafluoropropene and the Z isomer of 1,1,1,2,3-pentafluoropropene comprising subjecting the azeotrope-like composition to pressure swing distillation.