Patent ID: 9000238
Filing Date: 2015-04-07
Classification: C01B,C07C

Abstract:
1. A process for the purification of HF from a mixture comprising a fluoroolefin and HF, wherein HF is present in a concentration greater than the azeotrope concentration for HF and said fluoroolefin, said process comprising: a. adding an entrainer to the mixture comprising fluoroolefin and HF thus forming a second mixture; b. distilling said second mixture in a first distillation step to form a first distillate composition comprising an HF, entrainer, and fluoroolefin, and a first bottoms composition comprising HF; c. condensing said first distillate composition to form two liquid phases, being i) an entrainer-rich phase and ii) an HF-rich phase; and d. optionally recycling the HF-rich phase back to the first distillation step; wherein said fluoroolefin comprises: (i) at least one compound selected from the group consisting of HFC-1225ye, HFC-1234ze, HFC-1234yf, and HFC-1243zf (ii) 1,3,4,4,4-pentafluoro-3-(trifluoromethyl)-1-butene (CHF═CHCF(CF