Hoechst Aktiengesellschaft

Solvay (societe Anonyme)

Peter Hopp

Rolf-Michael Jansen

Uwe Wirth

Wolf-Dietmar Kaufmann

Method for preparing heptafluoropropane

Process for removing olefinic impurities from 2H-heptafluoropropane (R 227). The invention relates to a process for removing olefinic impurities from 2H-heptafluoropropane (R 227) by passing the contaminated R 227 in the gas phase at from -20.degree. to 100.degree. C. over aluminum oxide.

Process for removing olefinic impurities from 2H-heptafluoropropane (R

Process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane The invention relates to a process for the removal of olefinic impurities from 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the contaminated R 227 is brought into contact with an alcohol and a base, and the R 227 is simultaneously or subsequently removed by distillation.

Process for the removal of olefinic impurities from

The invention relates to a process for the reactivation of an activated charcoal catalyst employed in the preparation of 1,1,1,2,3,3,3-heptafluoropropane (R 227) in which the catalyst is heated to from 450.degree. to 900.degree. C. in a stream of inert gas or under reduced pressure.

Process for the reactivation of an activated charcoal catalyst employed

The invention relates to a process for the removal of olefins of the formula C.sub.n H.sub.x F.sub.y A.sub.z, in which A is chlorine and/or bromine and n is a number from 2 to 4, x and y are each a number from 1 to 6 and z is a number from 1 to 4, the sum of x+y+z being equal to 2n, from hydrochlorofluorocarbons of the formula C.sub.2 H.sub.m F.sub.p A.sub.q, in which A is chlorine and/or bromine and m and p are each a number from 1 to 5 and q is a number from 0 to 4, the sum of m+p+q being equal to 6, which comprises reacting the hydrochlorofluorocarbons C.sub.2 H.sub.m F.sub.p A.sub.q which are contaminated with the olefins mentioned, in the presence of oxygen-containing phase-transfer catalysts with complex hydrides and/or strong bases.

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Hofheim, Germany

Peter Hopp