METHOD FOR PREPARING 2,3,3,3-TETRAFLUORO-1-PROPENE AND RECYCLING 2-CHLORO-3,3,3-TRIFLUOROPROPENE FREE OF IMPURITIES
Abstract:
The invention concerns a method for purifying 2-chloro-3,3,3-trifluoropropene (1233xf) from a first composition comprising 2-chloro-3,3,3-trifluoropropene and at least one of the compounds chosen from the group consisting of E-1-chloro-3,3,3-trifluoro-1-propene (1233zd E), 1,1,1,3,3-pentafluoropropane (245fa) and 1,1,1,3,3,3-hexafluoropropane (236fa), said method comprising the steps of bringing said first composition into contact with at least one organic extractant in order to form a second composition; extractive distillation of said second composition in order to form a third composition comprising at least one of the compounds chosen from the group consisting of E-1-chloro-3,3,3-trifluoro-1-propene (1233zd E), 1,1,1,3,3-pentafluoropropane (245fa) and 1,1,1,3,3,3-hexafluoropropane (236fa), and said organic extractant; and a stream comprising 2-chloro-3,3,3-trifluoropropene.
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