Purification of 1,1-dichloro-1-fluoroethane
AssigneeSociete Atochem
InventorsYves Correia, Michel Bergougnan, Jean Lesparre, Sylvain Perdrieux
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Abstract
This invention relates to a process for the purification of 1,1-dichloro-1-fluorethane. To remove unsaturated impurities such as 1,1-dichloroethylene and dichloracetylene the crude 1,1-dichloro-1-fluoroethane is subjected to the action of chlorine and/or of a hydracid. This treatment is carried out in the presence of a Lewis acid, or, only in the case of chlorine, by photochemical catalysis.
Claims6
Process for the purification of a crude 1,1-dichloro-1-fluoroethane containing 1,1-dichloroethylene and/or dichloroacetylene comprising treating the crude 1,1-dichloro-1-fluoroethane with chlorine and/or HCl in the presence of a compound having catalytic activity consisting of SbCl.sub.5 or FeCl.sub.3 at a temperature between about -5 and about +30.degree. C., and at a pressure less than about 25 bars and then distilling the product treated in this way, substantially removing the 1,1-dichloroethylene and/or the dichloroacetylene from the 1,1-dichloro-1-fluoroethane, said chlorine and/or HCl acting to maintain the catalytic activity of said SbCl.sub.5 or FeCl.sub.3 during said purification.
Dependencies are inferred from the claim text.