Azeotrope-like composition of 1,1,1,3,3-pentafluoropropane and 1-chloro-1,1,3,3,3-pentafluoropropane
AssigneeHoneywell International Inc.
InventorsKane David Cook, Rajiv Ratna Singh, Hsueh Sung Tung
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Abstract
Provided are azeotropic and azeotrope-like mixtures of 1,1,1,3,3-pentafluoropropane (HFC-245fa) and 1-chloro-1,1,3,3,3-pentafluoropropane (HCFC-235fa) that are useful as intermediates in the production of HFC-245fa. A process for separating HFC-245fa and HCFC-235fa is also provided. HFC-245fa is useful as a nontoxic, zero ozone depleting fluorocarbon useful as solvents, blowing agents, refrigerants, cleaning agents, aerosol propellants, heat transfer media, gaseous dielectrics, fire extinguishing compositions and power cycle working fluids.
Claims9
An azeotropic or azeotrope-like composition consisting essentially of 1,1,1,3,3-pentafluoropropane and 1-chloro-1,1,3,3,3-pentafluoropropane.
A process for separating 1,1,1,3,3-pentafluoropropane from an azeotropic or azeotrope-like mixture of 1,1,1,3,3-pentafluoropropane and 1-chloro-1,1,3,3,3-pentafluoropropane, which process comprises, consists essentially of, or consists of the steps of:
- (A) distilling a mixture comprising, consisting essentially of, or consisting of at least an azeotropic mixture of 1,1,1,3,3-pentafluoropropane and 1-chloro-1,1,3,3,3-pentafluoropropane at a first pressure to produce a first overhead stream enriched in either the 1,1,1,3,3-pentafluoropropane or 1-chloro-1,1,3,3,3-pentafluoropropane 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.
Dependencies are inferred from the claim text.