Basf Aktiengesellschaft

Basf Corporation

Gerald Neubauer

Hugo Fuchs

Josef Ritz

Franz-Josef Weiss

Gerhard Frank

Claus-Ulrich Priester

Heinz-Walter Schneider

Hans J Wilfinger

Paul Duffner

Wolfgang Hoelderich

Peter Rudolf

Manfred Ohlinger

Uwe Brand

David Agar

Klaus Kartte

Werner Steigleiter

Emil Pfannebecker

Emile De Decker

Jozef Oostvogels

Luc Guns

Gerard Van Wauwe

Rolf Hartmuth Fischer

Juergen Hartig

Uwe Vagt

Michael Kopietz

Rolf Schnabel

Erwin Brunner

Hans H Schuster

Ernst Deuker

Paul-Michael Bever

Bernhard Holzknecht

Thomas P Losier

Emile DeDecker

Donald R Johnson

David Agab

Josef Beullens

Caprolactam is recovered from oligomers and/or polymers of caprolactam by cleavage of oligomers and/or polymers of caprolactam and subsequent working up by distillation of the caprolactam obtained in the cleavage, by a process including

Recovery of caprolactam from oligomers and/or polymers of caprolactam

A hydrogenation catalyst, obtainable by carrying out essentially the following steps:

Hydrogenation catalyst based on a platinum metal partially poisoned with

Caprolactam is purified by oxidative treatment in which mixtures which essentially contain the caprolactam to be purified and unsaturated lactams are treated with oxygen or an oxygen-containing gas mixture in an alkaline medium.

Purification of caprolactam

A process of use of hydrogenation catalyst, obtainable by carrying out essentially the following steps:

Method of use of a hydrogenation catalyst based on a platinum metal

A hydrogenation catalyst, obtainable by carrying out essentially the following steps: (a) treatment of a platinum metal salt with finely divided sulfur followed by (b) reduction of the platinum metal salt to metallic platinum metal.

A process for the purification of caprolactam from crude caprolactam by distilling the crude caprolactam in the presence of an anorganic or organic acid.

Process for the purification of crude caprolactam

A process for recovering caprolactam from oligomers and/or polymers of caprolactam comprises the following steps:

Caprolactam is recovered from polycaprolactam by hydrolyric cleavage of polycaprolactam with from 5 to 50 parts by weight of water per part by weight of polycaprolactam at from 200.degree. to 350.degree. C. under superatmospheric pressure to give an aqueous solution or suspension which contains monomeric caprolactam and oligomers thereof and may contain polycaprolactam and subsequent isolation of monomeric caprolactam from the aqueous solution or suspension by distillation or extraction, by a process in which the hydrolyric cleavage is carried out in the presence of an alkali metal hydroxide at a pH of from 5 to 10.

Recovery of caprolactam from polycaprolactam

A process for preparing caprolactam by Beckmann rearrangement of cyclohexanone oxime with oleum at from 85.degree. to 125.degree. C. in a plurality of rearrangement stages arranged in series entails returning a portion of the reaction mixture leaving the last rearrangement stage to at least one of the preceding rearrangement stages.

Preparation of caprolactam by Beckmann rearrangement of cyclohexanone

The preparation of cyclohexene oxide, cyclohexanol and cyclohexanone involves

Cyclic preparation of cyclohexene oxide, cyclohexanol and cyclohexanone

A platinum-on-graphite catalyst having a platinum content of from 0.01 to 5% w/w, wherein the graphite support has an apparent density of from 1.7 to 2.2 g/ml and the use thereof as a hydrogenation catalyst.

Platinum-on-graphite catalysts

A process for working up aqueous mother liquors containing hydrochloric acid, sulfuric acid and their hydroxylammonium and ammonium salts, entails the mother liquors being intimately mixed with an excess of cyclohexanone based on the content of hydroxylammonium salts, while maintaining a pH of from 3 to 5.5 by adding alkali metal hydroxide solutions, and the cyclohexanone phase which contains cyclohexanone oxime being removed and washed with water until essentially free of chloride.

Work-up of aqueous mother liquors containing hydrochloric acid, sulfuric

A platinum-on-graphite catalyst having a platinum content of from 0.01 to 5% w/w, wherein the graphite support has a particle size of from 1 to 600 .mu.m and the following particle size distribution:

Platinum-on-graphite catalysts and the use thereof

Caprolactam is purified continuously by passing a 75-95% strength by weight aqueous caprolactam solution together with hydrogen at 50.degree.-95.degree. C. and 1.5-100 bar upward through a fixed-bed supported palladium or nickel catalyst in a tubular zone while maintaining a residence time of from 10 to 100 min.

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Weinheim, Germany

Gerald Neubauer