Bayer Aktiengesellschaft

Klaus Starke

Otto Immel

Hans-Helmut Schwarz

Bernd-Ulrich Kaiser

Harry Danziger

Andre De Jager

A process for the regeneration of a granular, supported catalyst of boric acid on carbon, wherein a part of the catalyst is removed from a fluidized bed reactor, in which cyclohexanone oxime is rearranged into caprolactam on this catalyst, when the 'differential content in the catalyst of organic nitrogen' is between 0.3 and 2.0% by weight and is replaced by an equal amount of regenerated catalyst so that the differential organic nitrogen content remains in the above-mentioned range, the quantity of catalyst removed is regenerated with air in a fluidized bed at a temperature of from 400.degree. to 700.degree. C. and is returned to the fluidized bed reactor used for rearrangement when a further part of the catalyst is removed therefrom for regeneration.

Catalyst regeneration of boric acid on carbon catalysts

A process for the production of .epsilon.-caprolactum from cyclohexanone oxime by rearrangement in the gaseous phase on a fluid-bed catalyst containing boron oxide, wherein residues from the distillation of cyclohexanone oxime are introduced into the reaction in liquid form, and wherein from 5 to 500 times their quantity of cyclohexanone oxime in vapor form and at least 50 times their quantity of inert gas are present during the reaction.

Process for the producing .epsilon.-caprolactam from the distillation of

A process for the evaporation of cyclohexanone oxime, wherein the cyclohexanone oxime is evaporated in the presence of an inert gas at a superatmospheric pressure of at least 300 Torr at 110.degree. to 160.degree. C, the evaporation temperature being governed by the inert gas pressure or by the ratio of cyclohexanone oxime to inert gas.

Growing community of inventors

Krefeld, Germany

Klaus Starke