Processes for separating 1,1,1,3,3-pentafluoropropane from a mixture comprising 1,1,1,3,3-pentafluoropropane and 1-chloro-3,3,3-trifluoropropene

Abstract

Methods and materials are provided for the production and purification of halogenated compounds and intermediates in the production of 1,1,1,3,3-pentafluoropropane. In a preferred embodiment, the process steps include: (1) reacting carbon tetrachloride with vinyl chloride to produce 1,1,1,3,3-pentachloropropane; (2) dehydrochlorinating the 1,1,1,3,3 -pentachloropropane with a Lewis acid catalyst to produce 1,1,3,3-tetrachloropropene; (3) fluorinating the 1,1,3,3-tetrachloropropene to produce 1-chloro-3,3,3-trifluoropropene; (4) fluorinating the 1-chloro-3,3,3-trifluoropropene to produce a product mixture containing 1,1,1,3,3 -pentafluoropropane; and (5) separating 1,1,1,3,3-pentafluoropropane from by-products.

1 - 35 . (canceled)  
     
     
         36 . A process of separating 1,1,1,3,3-pentafluoropropane from a mixture comprising 1,1,1,3,3-pentafluoropropane and 1-chloro-3,3,3-trifluoropropene comprising distilling a mixture comprising 1,1,1,3,3-pentafluoropropane and 1-chloro-3,3,3-trifluoropropene in the presence of HF to produce a bottom product comprising 1-chloro-3,3,3-trifluoropropene essentially free 1,1,1,3,3-pentafluoropropane and a distillate.  
     
     
         37 . The process of  claim 36  wherein the mixture comprises less than about 0.1% 1-chloro-3,3,3-trifluoropropene.  
     
     
         38 . The process of  claim 36  wherein the mixture comprises about 99.8% 1,1,1,3,3-pentafluoropropane.  
     
     
         39 . The process of  claim 36  wherein the HF is about 3.66% by weight of the 1,1,1,3,3-pentafluoropropane.  
     
     
         40 . The process of  claim 36  wherein the bottom product is about 99.0% 1,1,1,3,3-pentafluoropropane.  
     
     
         41 . The process of  claim 36  wherein the bottom product is less than about 0.01% 1-chloro-3,3,3-trifluoropropene.  
     
     
         42 . The process of  claim 36  wherein the distillate is at least about 1.0% 1-chloro-3,3,3-trifluoropropene.  
     
     
         43 . The process of  claim 36  wherein the distillate comprises 1-chloro-3,3,3-trifluoropropene and HF.  
     
     
         44 . The process of  claim 36  further comprising providing the distillate to a halogenation reaction.  
     
     
         45 . The process of  claim 36  further comprising scrubbing the bottom product to remove residual water.  
     
     
         46 . The process of  claim 45  wherein the scrubbing comprises exposing the bottom product to water.  
     
     
         47 . The process of  claim 45  wherein the scrubbing comprises exposing the bottom product to water and a caustic.