Azeotropic compositions of 2-chloro-3,3,3-trifluoropropene (hcfc-1233xf), 2-chloro-1,1,1,2-tetrafluoropropane (hcfc-244bb), and hydrogen fluoride (hf)
AssigneeHoneywell International Inc.
InventorsDANIEL C. MERKEL, Konstantin A. Pokrovski, Hsuehsung Tung, Hang T. Pham, Rajiv R. Singh
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Abstract
Provided are ternary azeotropic and azeotrope-like compositions of 2-chloro-3,3,3-trifluoropropene (HCFO-1233xf), 2-chloro-1,1,1,2-tetrafluoropropane (HCFC-244bb), and hydrogen fluoride (HF). Such azeotropic and azeotrope-like compositions are useful as intermediates in the production of 2,3,3,3-tetrafluoropropene (HFO-1234yf).
Claims25
A ternary azeotropic or azeotrope-like composition consisting essentially of hydrogen fluoride, 2-chloro-3,3,3-trifluoropropene, and 2-chloro-1,1,1,2-tetrafluoropropane.
An azeotropic or azeotrope-like composition which consists essentially of from about 1 to about 50 weight percent hydrogen fluoride, from about 50 to about 99 weight percent of an organic portion consisting essentially of 2-chloro-3,3,3-trifluoropropene and 2-chloro-1,1,1,2-tetrafluoropropane, wherein the 2-chloro-3,3,3-trifluoropropene in the organic portion of the mixture is present in the amount from about 50 to about 90 weight percent of the organic portion, and the 2-chloro-1,1,1,2-tetrafluoropropane in the organic portion of the mixture is present in the amount from about 10 to about 50 weight percent of the organic portion, and the azeotropic composition has a boiling point of from about 0° C. to about 61° C. at a pressure of from about 15 psia to about 108 psia.
A method of forming an azeotropic or azeotrope-like composition which comprises forming a blend consisting essentially of from about 1 to about 50 weight percent hydrogen fluoride, from about 50 to about 99 weight percent of an organic portion consisting essentially of 2-chloro-3,3,3-trifluoropropene and 2-chloro-1,1,1,2-tetrafluoropropane, wherein the 2-chloro-3,3,3-trifluoropropene in the organic portion of the mixture is present in the amount from about 50 to about 90 weight percent of the organic portion, and the 2-chloro-1,1,1,2-tetrafluoropropane in the organic portion of the mixture is present in the amount from about 10 to about 50 weight percent of the organic portion to thereby form an azeotropic or azeotrpic-like composition having a boiling point of from about 0° C. to about 61° C. at a pressure of from about 15 psia to about 108 psia.
A method for removing 2-chloro-3,3,3-trifluoropropene and 2-chloro-1,1,1,2-tetrafluoropropane from a mixture containing 2-chloro-3,3,3-trifluoropropene, 2-chloro-1,1,1,2-tetrafluoropropane and at least one other component, which comprises adding hydrogen fluoride to the mixture in an amount sufficient to form a ternary azeotropic or azeotrope-like composition of the hydrogen fluoride, 2-chloro-3,3,3-trifluoropropene and 2-chloro-1,1,1,2-tetrafluoropropane and thereafter separating the ternary azeotropic composition from the at least one other component.
Dependencies are inferred from the claim text.