Integrated process to produce 2,3,3,3-tetrafluoropropene

Abstract

The invention relates to a separation process whereby 2-chloro-3,3,3-trifluoropropene (1233xf) is separated from a mixture containing other fluorinated organics and high boiling materials such as dimers using azeotropes of HF formed by adding appropriate amounts to the mixture which facilitate separation by, e.g. distillation.

1 - 20 . (canceled) 
     
     
         21 . An azeotrope composition comprising HF and at least one or more organics selected from the group consisting of trichlorofluoropropene (1231) isomers, 1,1,1,2,2-pentafluoropropane (245cb), dichlorotrifluoropropane (243) isomers, trichlorodifluorpropane (242) isomers, and 1,1,2,3-tetrachloropropene (1230xa). 
     
     
         22 . The azeotrope composition according to  claim 21  in which a 243 isomer is 2,3-dichloro-1,1,1-triflurorpropane (243db). 
     
     
         23 . The azeotrope composition of  claim 21  which is a binary or tertiary azeotrope. 
     
     
         24 . The azeotrope composition of  claim 21  wherein the HF-azeotrope is selected from the group consisting of 1230xa/HF and 243db/HF. 
     
     
         25 . The azeotrope composition of  claim 21  wherein the concentration of HF ranges from 5 to 95 wt %. 
     
     
         26 . The azeotrope composition of  claim 24  herein the concentration of HF ranges from 20 to 80 wt %. 
     
     
         27 . The azeotrope composition of  claim 25  wherein the concentration of HF ranges from 30 to 70 wt %. 
     
     
         28 . A composition comprising HF-azeotropes of 1233xf and at least one organic selected from trichlorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xf), 2-chloro-1,1,1,2,2-pentafluoropropane (245cb), dichlorotritluoropropane (243) isomers, and trichlorodifluorpropane (242) isomers. 
     
     
         29 . The composition of  claim 28  wherein the concentration of HF ranges from 5 to 95 wt %. 
     
     
         30 . The composition of  claim 29  wherein the concentration of HF ranges from 20 to 80 wt %. 
     
     
         31 . The composition of  claim 30  wherein the concentration of HF ranges from 30 to 70 wt. 
     
     
         32 . A composition comprising 2-chloro-3,3,3-trifluoropropene (1233xf) and at least one organic selected from trichiorofluoropropene (1231) isomers, 2,3-dichloro-3,3-difluoropropene (1232xt), 2-chloro-1,1,1,2-tetrafluoropropane (244bb), 1,1,1,2,2-pentafluoropropane (245cb), dichlorotrifluoropropane (243), and trichlorodifluorpropane (242), and one or more dimers selected from the group consisting of C 6 H 3 F 6 Cl, C 6 H 3 F 7 Cl 2 , C 6 F 6 Cl 2 , C 6 H 5 Cl 2 , C 6 F 5 Cl 3 , C 6 H 3 F 2 Cl 5 , and combinations thereof. 
     
     
         33 . The composition according to  claim 32  wherein HF is additionally present. 
     
     
         34 . The composition according to  claim 32  in which a 243 isomer is 2,3-dichloro-1,1,1-triflurorpropane (243db). 
     
     
         35 . A composition comprising one or more dimers selected from the group consisting of C 6 H 3 F 6 Cl, C 6 H 3 F 7 Cl 2 , C 6 F 6 Cl 2 , C 6 H 8 Cl 2 , C 6 F 5 Cl 3 , C 6 H 3 F 2 Cl 5 , and combinations thereof.