Elf Atochem S.a.

Pierre Ravenel

Roland Bachelard

Jean-Pierre Disson

Serge Hub

Philippe Joubert

The invention relates to the purification of pentafluoroethane (F125) containing chloropentafluoroethane (F115) by vapor-phase catalytic hydrogenolysis. A catalyst based on palladium deposited on aluminium trifluoride is employed.

Purification of pentafluoroethane

The invention relates to a continuous process for the preparation of aluminum nitride by the carbonitriding of alumina. According to this process, a reaction that uses alumina, carbon, and a resin that generates carbon by pyrolysis is performed in a methodical reactor. The invention relates to a continuous process for the preparation of aluminum nitride by the carbonitriding of alumina.

Continuous process for the preparation of aluminum nitride by the

Aluminum nitride (AlN) is continuously produced by continuously carbonitriding a continuously replenished charge of alumina, for example successive charges of alumina/carbon extrudates, in a reaction zone comprising at least one conduit, the ratio of the exchange surface area/volume of which at least one conduit ranging from 5 to 50 m.sup.-1, preferably from 10 to 50 m.sup.-1, and continuously withdrawing product AlN therefrom.

Carbonitriding of alumina to produce aluminum nitride

The invention relates to a continuous process for the preparation of aluminium nitride by the carbonitriding of alumina. According to this process, the reaction, which employs alumina, carbon and nitrogen, is carried out in a moving-bed reactor characterized in that the reaction area has a plurality of conduits.

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Saint Genis Laval, France

Pierre Ravenel