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US 5,626,725 AGranted
Process for separation of 1,1-difluoroethane from its mixture with hydrogen fluoride
AssigneeSolvay (Societe Anonyme)
InventorsDominique Balthasart, Philippe Decap
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Abstract
The invention relates to a process for separating 1,1-difluoroethane from its mixtures with hydrogen fluoride, in which the mixture is subjected to a distillation in a column operating at a pressure of less than 10 bar.
Claims5
A process for the manufacture of 1,1-difluoroethane comprising:
- (a) reacting, at a pressure higher than 10 bar, hydrogen fluoride with a chlorinated compound selected from vinyl chloride and 1,1-dichloroethane, to obtain a mixture of reaction products containing 1,1-difluoroethane, hydrogen chloride and unconverted hydrogen fluoride;
- (b) distilling said mixture in a column having a top operating at a pressure of 10 bar or less;
- and
- (c) recovering, at the top of said column, a purified stream of 1,1-difluoroethane, said stream containing less than 1 mol % of hydrogen fluoride.
1 more element
Dependencies are inferred from the claim text.