Catalyst regeneration of boric acid on carbon catalysts

US4155876A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Harry Danziger · London, GB
• Otto Immel · Krefeld, DE
• Bernd-Ulrich Kaiser
• Hans-Helmut Schwarz · Krefeld, DE
• Klaus Starke · Krefeld, DE

Key dates

• Filing date: Sep 9, 1977
• Grant date: May 22, 1979
• Expiry date: Sep 9, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/584
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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.