Process for the preparation of partly flourinated ethanes
AssigneeHoechst Aktiengesellschaft
InventorsHans R. Cremer, Harald Noichl
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Abstract
A process for the preparation of partly fluorinated ethanes of the general formula CF.sub.3 --CFH.sub.x Cl.sub.2-x in which x=0, 1 or 2, is indicated which comprises reacting, as the reactant, partly fluorinated ethane of the general formula C.sub.2 F.sub.3 H.sub.x Cl.sub.3-x in which x=0, 1, or 2, and, as the fluorinating agent, partly fluorinated ethanes of the general formula CF.sub.3-x Cl.sub.x --CH.sub.3-y Cl.sub.y in 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.
Claims1
A process for the preparation of a partly fluorinated ethane of the formula
- CF.sub.3 --CFH.sub.x Cl.sub.2-x
- in which x=0, 1 or 2, which comprises reacting, as the reactant,
- CF.sub.3 --CH.sub.x Cl.sub.3-x
- and, as the fluorinating agent CF.sub.2 ClChCl.sub.2, CF.sub.2 Cl--CH.sub.2 Cl, CF.sub.3 --CH.sub.2 Cl or CF.sub.3 CH.sub.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, the molar ratio of said reactant to said fluorinating agent being 2.2:1 to 4.4:1.
Dependencies are inferred from the claim text.