MIXTURE SEPARATION CONTAINING AT LEAST ONE HYDROFLUOROALKANE AND HYDROGEN FLUORIDE, METHOD FOR PRODUCTION OF HYDROFLUOROALKANE AND AZEOTROPE COMPOSITION Russian patent published in 2005 - IPC

FIELD: organic chemistry.

SUBSTANCE: claimed method includes interaction of mixture C3-C6-hydrofluoroalkane/hydrogen fluoride in absence of catalyst with at least one chloro-containing or cloro- and fluoro-containing organic compound reactive towards hydrogen fluoride in liquid phase. Hydrofluoroalkane is obtained by interaction of at least one chloro-containing or cloro- and fluoro-containing precursor with hydrogen fluoride in the first step. In one of the next steps at least part of products from the first step is made to react with hydrogen fluoride, wherein one step includes separation method. Also disclosed are azeotrope or pseudo-azeotrope composition applicable for 1,1,1,3,3-pentafluorobutane purification. Claimed composition contains as main components 1.5-27.5 mol.% of 1,1,1,3,3-pentafluorobutane and 72.5-98.5 mol.% of hydrogen fluoride.

EFFECT: method with optimized parameters.

16 cl, 4 dwg, 1 tbl, 5 ex