From the blend of the hydrogien fluoride and 1,1 - the dichloro - 1 - fluoro ethane 1,1 - the dichloro - 1 - the manner null which separates fluoro ethane

摘要

PURPOSE:To separate the subject compound by distilling a mixture of hydrogen fluoride and 1,1-dichloro-1-fluoroethane to separate a distillate comprising an azeotropic composition containing a small amount of either of the hydrogen fluoride and the 1,1-dichloro-1- fluoroethane, liquidizing the separated distillate gas with a condenser to form two liquid phases, removing either of the two liquid phases and subsequently refluxing the remaining liquid phase. CONSTITUTION:A mixture of hydrogen fluoride and 1,1-dichloro-1-fluoroethane is subjected to a distillation process to distill out a distillate comprising a separated composition (preferably an azeotropic composition) containing a small amount of either of the hydrogen fluoride and the 1,1-dichloro-1-fluoroethane. A small amount of the major component is preferably further distilled out to perfectly separate the small distilled component and the distilled-out gas is liquidized in a condenser. The condensed distillate is sent into a separating tank and separated into two liquid phases, followed by take out either of the prepared lower and upper liquid phases. The remaining liquid phase is refluxed and returned to the distillation tower, thereby permitting to separate the 1,1-dichloro-1-fluoroethane substantially not containing the hydrogen fluoride. The method is most suitable for the after treatment of the reaction products when the subject compound is produced from the 1,1,1-trichloroethane and the hydrogen fluoride.