METHODS OF SEPARATING 2,3,3,3-TETRAFLUOROPROPENE FROM HYDROGEN FLUIORIDE BY AZEROTROPIC DISTILLATION Russian patent published in 2013 - IPC C07C17/383 C07C17/386 C07C21/18 

FIELD: chemistry.

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

EFFECT: present invention provides a novel method of separating HF and HFO-1234yf.

14 cl, 9 ex, 9 tbl, 8 dwg