METHOD OF SEPARATING 1,3,3,3,-TETRAFLUOPROPENE FROM HYDROGEN FLUORIDE BY AZEOTROPIC DISTILLATION Russian patent published in 2013 - IPC C07C17/383 C07C17/386 C07C21/18 

FIELD: chemistry.

SUBSTANCE: one of the versions involves: a. feeding a composition containing HF and HFO-1234ze into a first distillation column; b. removing the azeotropic composition containing HF and HFO-1234ze as a first distillate and either i) HF or ii) HFO-1234ze as a composition of distillation residues of the first column; c. condensation of the first distillate to form 2 liquid phases which are i) a phase rich in HF and ii) a phase rich in HFO-1234ze; and d. recycling the first liquid phase rich in the same compound, which is removed as distillation residues of the first column, said first liquid phase being either i) a phase rich in HF or ii) a phase rich in HFO-1234ze, back into the first distillation column. The invention also relates to a method of separating HFO-1234yf from HFO-1234ze to form an azeotropic mixture containing HF and HFO-1234ze.

EFFECT: invention provides a novel method of separating HF from HFO-1234ze.

17 cl, 9 ex, 9 tbl