# US 7,608,574 B2 · Azeotropic or azeotropic-like compositions of 1,1,1-trifuoroethane and 1-chloro-2,2,2-trifluoroethane > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,574 B2 - Document ID: US7608574B2 - Status: Granted - Kind: B2 - Application number: 11/506,129 - Filed: 2006-08-17 - Published: 2008-02-21 - Granted: 2009-10-27 - Earliest claimed: 2006-08-17 - Assignees: Honeywell International Inc. - Inventors: Stephen A. Cottrell; Hang T. Pham; Rajiv R. Singh; Hseuhsung Tung - Web page: https://patentgrep.com/patent/US7608574B2 ## CPC - C07C 17/21: with simultaneous increase of the number of halogen atoms - C07C 17/386: with auxiliary compounds - C07C 19/08: containing fluorine - C07C: ACYCLIC OR CARBOCYCLIC COMPOUNDS ## Abstract Azeotropic or azeotropic-like compositions of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a). ## Claims ### Claim 1 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). ### Claim 2 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1, which consists essentially of effective amounts of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a). ### Claim 3 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which consists essentially of: from about 70% up to an amount just less than about 100% by weight of HFC-143a, and from about 30% by weight down to an amount just more than 0% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 4 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which consists essentially of: from about 75% to about 99.9% by weight of HFC-143a, and from about 0.1 to about 25% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 5 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which consists essentially of: from about 90% to about 99.9% by weigh of HFC-143a, and from about 0.1 to about 10% by weigh of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 6 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which has a boiling point of about 46.5±2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 7 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which has a boiling point of about −46.6° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 8 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which has a boiling point of about −46.8° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 9 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which has a boiling point of about −47° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 10 (depends on 1) An azeotropic or azeotropic-like composition according to claim 1 which has a boiling point of about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 11 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). ### Claim 12 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction consists essentially of effective amounts of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a). ### Claim 13 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction consists essentially of: from about 70% by weight up to an amount just less than about 100% by weight of HFC-143a, and from about 30% by weight down to an amount just more than 0% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 14 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction consists essentially of: from about 75% to about 99.9% by weight of HFC-143a, and from about 0.1 to about 25% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 15 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction consists essentially of from about 90% to about 99.9% by weight of HFC-143a, and from about 0.1 to about 10% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 16 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction has a boiling point of about 46.5±2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 17 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction has a boiling point of about −46.6° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 18 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction has a boiling point of about −46.8° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 19 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction has a boiling point of about −47° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 20 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction has a boiling point of about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 21 (depends on 11) The process according to claim 11 wherein the azeotropic or azeotrope-like composition distilled from the product of the reaction is recycled back to the reactor. ### Claim 22 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. ### Claim 23 (depends on 22) The process according to claim 22 wherein the separation is conducted by distillation. ### Claim 24 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope like composition consists essentially of effective amounts of 1,1,1-trifluoroethane (HFC-143a) and 1-chloro-2,2,2-trifluoroethane (R-133a). ### Claim 25 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition consists essentially of from about 70% by weight up to an amount just less than about 100% by weight of HFC-143a, and from about 30% by weight down to an amount just more than 0% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 26 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition consists essentially of from about 75% to about 99.9% by weight of HFC-143a, and from about 0.1 to about 25% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 27 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition consists essentially of from about 90% to about 99.9% by weight of HFC-143a, and from about 0.1 to about 10% by weight of R-133a, wherein the weight percentages are based on the total weight of the composition. ### Claim 28 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition has a boiling point of about 46.5±2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 29 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition has a boiling point of about −46.6° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 30 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition has a boiling point of about −46.8° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 31 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition has a boiling point of about −47° C. to about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 32 (depends on 22) The process according to claim 22 wherein the azeotropic or azeotrope-like composition has a boiling point of about −47.2° C. at an atmospheric pressure of about 14.42 psia. ### Claim 33 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.