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US H1,188 HGranted
Process for making 1,1-dichloro-1,2-difluoroethane
AssigneeE. I. Du Pont de Nemours and Company
InventorsMario J. Nappa, Allen C. Sievert
Life of this patent
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Abstract
A process for the preparation of 1,1-dichloro-1,2-difluoroethane (HCFC-132c) comprising contacting 1,1-dichloroethylene with lead dioxide and anhydrous hydrogen fluoride. Addition of fluorine to the double bond of vinylidene chloride can be achieved using inexpensive and readily available commercial raw materials.
Claims14
A process for preparing 1,1-dichloro-1,2-difluoroethane comprising the steps of:
- (a) contacting 1,1-dichloroethylene with lead dioxide and anhydrous hydrogen fluoride at an effective temperature and for a sufficient time to convert at least a portion of said 1,1-dichloroethylene to 1,1-dichloro-1,2-difluoroethane substantially free of dehydrohalogenation;
- and
- (b) recovering said 1,1-dichloro-1,2-difluoroethane substantially free of dehydrohalogenated products.
Dependencies are inferred from the claim text.