Abstract: The invention relates to a process for the preparation of 1,1,1-trifluoro-2,2-dichloroethane by chlorinating 1,1,1-trifluoro-2-chloroethane, in which the chlorination is carried out under an elevated pressure. The pressure is preferably 10 to 400 bar, particularly 50 to 250 bar. If the reaction is initiated by heat, it is preferably carried out at 200.degree. to 300.degree. C. If it is initiated by a free-radical starter, the reaction is preferably carried out at 150.degree. to 250.degree. C.

Abstract: A process for the preparation of partly fluorinated ethanes of the general formulaCF.sub.3 --CFH.sub.x Cl.sub.2-xin which x=0, 1 or 2, is indicated which comprises reacting, as the reactant, partly fluorinated ethane of the general formulaC.sub.2 F.sub.3 H.sub.x Cl.sub.3-xin which x=0, 1, or 2, and, as the fluorinating agent, partly fluorinated ethanes of the general formulaCF.sub.3-x Cl.sub.x --CH.sub.3-y Cl.sub.yin which x=0, 1 or 2 and y=0, 1, 2 or 3 with one another in gaseous form in the presence of a chromium catalyst at temperatures of 150.degree. to 600.degree. C., the reactant and the fluorinating agent having the same chemical structural formula being excluded.