METHOD OF SEPARATING FLUOROLEFINS FROM FLUOROHYDROGEN BY AZEOTROPIC DISTILLATION Russian patent published in 2012 - IPC C07C17/383 C07C17/386 C01B7/19 C07C21/18 

FIELD: chemistry.

SUBSTANCE: described are methods of separating any of HFC-1225ye, HFC-1234ze, HFC-1234yf or HFC-1243zf from HF. One of methods includes separation of mixture, which contains HF and fluorolefin, where said method includes a) supply of composition, containing HF and fluorolefin, to first distillation column; b) discharge of azeotropic composition, containing HF and fluorolefin as first distillate and either i) HF, or i) fluorolefin as composition of vat residue of first column; c) condensation of first distillate with formation of two liquid phases: i) HF-saturated phase and ii) fluorolefin-enriched phase; and d) recirculation of first liquid phase, enriched with the same compound, which is removed as vat residue of first column, where said first liquid phase is either i) HF-enriched phase, or ii) fluorolefin-enriched phase, back into first distillation column.

EFFECT: invention presents more efficient method of HF separation from olefins.

33 cl, 13 ex, 14 tbl, 8 dwg