Ec Erdolchemie Gmbh

Ernst-Friedrich Neeb

Jens Herwig

Hans-Jurgen Haardt

Nikolaus Paris

Brigitte Beuke

Molybdenum/bismuth-based fluid-bed catalysts which are used for the ammoxidation of olefins can be reactivated by addition of a mixed oxide of formula

Process for reactivating ammoxidation catalysts

The ammonium sulphate contained in tar-rich waste streams from the production of (meth)acrylonitrile can be precipitated out by adding 1 to 30 times the amount by weight of methanol, relative to the water content of the waste stream, and additionally 0.05 to 10% the amount by weight of ammonia, relative to methanol, to such a waste stream at 10.degree.-60.degree. C. and separating off the ammonium sulphate which precipitates out. The waste stream remaining after separating off the ammonium sulphate can, for example, be disposed of as low-sulphur waste-fuel in a combustion chamber.

Growing community of inventors

Dormagen, Germany

Ernst-Friedrich Neeb