Patent ID: 6863780
Filing Date: 2005-03-08
Classification: C07C

Abstract:
1. A process of separating or purifying 1,1,1,3,3-pentafluoropropane in which a mixture comprising at least 1,1,1,3,3-pentafluoropropane and hydrogen fluoride is subjected to a distillation step so that a distillate is obtained which comprises an azeotropic mixture consisting essentially of 1,1,1,3,3-pentafluoropropane and hydrogen fluoride, wherein under a pressure in a range of 2.95 kg/cm 2 -gauge to 9.60 kg/cm 2 -gauge, at a temperature of about 40° C. to about 80° C., the azeotropic mixture has a 1,1,1,3,3-pentafluoropropane/hydrogen fluoride molar ratio in a range of about 34.5/65.5 to about 48.5/51.5, and a bottom product is obtained which comprises 1,1,1,3,3-pentafluoropropane substantially free from hydrogen fluoride.