Azeotropic or azeotropic-like compositions of 1,1,1-trifuoroethane and 1-chloro-2,2,2-trifluoroethane
AssigneeHoneywell International Inc.
InventorsStephen A. Cottrell, Hang T. Pham, Rajiv R. Singh, Hseuhsung Tung
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Abstract
Azeotropic or azeotropic-like compositions of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a).
Claims33
An azeotropic or azeotropic-like composition comprising effective amounts of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a).
In a process for producing 1,1,1-trifluoroethane (HFC-143a) by the reaction of vinylidene chloride with HF, the improvement comprising purifying the 1,1,1-trifluoroethane (HFC-143a) by distilling off from the product of the reaction an azeotropic or azeotrope-like composition comprising effective amounts of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a).
A process for removing 1-chloro-2,2,2-trifluoroethane (R-133a) impurity from a mixture 1,1,1-trifluoroethane (HFC-143a) and R-133a impurity comprising forming an azeotropic or azeotrope-like composition of the HFC-143a and R-133a and thereafter separating the azeotropic or azeotrope-like composition from the mixture.
A process of distilling a composition comprising HFC-143a and R133a in a distillation column wherein, as a result of the distillation, the R-133a concentration is higher at the top of the column is higher than the concentration of R-133a in the composition at the bottom of the column.
Dependencies are inferred from the claim text.