Back to results
US 5,346,594 AGranted
Process for the purification of 1,1-dichloro-1-fluoroethane
AssigneeSolvay (Societe Anonyme)
InventorsPaul Lechaude, Gilles Darago, Philippe Krafft, Jean-Pierre Catinat
Life of this patent
Estimating the term…
Abstract
A process for purification of crude, 1,1-dichloro-1-fluoroethane includes the steps of treating a mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine in the presence of a Lewis acid, and distilling to recover purified 1,1-dichloro-1-fluoroethane, wherein hydrogen fluoride is present during the treatment with chlorine at a ratio of at least 5% by weight with respect to the mixture of crude, 1,1-dichloro-1-fluoroethane and hydrogen fluoride.
Claims8
Process for purification of crude 1,1-dichloro-1-fluoroethane, comprising:
- (a) treating a mixture consisting essentially of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride with chlorine at a ratio of chlorine which does not exceed 50% by weight based on the weight of the mixture of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride in the presence of a Lewis acid;
- and
- (b) distilling to recover purified 1,1-dichloro-1-fluoroethane,
- wherein hydrogen fluoride is present during the treatment with chlorine at a ratio of at least 5% by weight with respect to the mixture of crude 1,1-dichloro-1-fluoroethane and hydrogen fluoride.
1 more element
Dependencies are inferred from the claim text.