Basf Aktiengesellschaft

Basf Corporation

Hugo Fuchs

Gerald Neubauer

Josef Ritz

Franz-Josef Weiss

Uwe Brand

Klaus Kartte

Claus-Ulrich Priester

Erwin Thomas

Peter Horn

Otto-Alfred Grosskinsky

Heinz-Walter Schneider

Elmar Frommer

Ruediger Schmitz

Ernst Deuker

Rudolph Hans Gath

Wolfgang Hoelderich

Michael Kopietz

David Agar

Werner Steigleiter

Klaus Wintermantel

Bernhard Holzknecht

Luc Guns

Rolf Hartmuth Fischer

Heinz Auer

Uwe Vagt

Eckhard Hetzel

Peter Thoma

Erwin Brunner

Guenther Rapp

Hans J Wilfinger

Dieter Stockburger

Ulrich Kalck

Richard Thoma

Simon A Jones

Thomas P Losier

Emile De Decker

Kurt Kahr

Gerard Van Wauwe

Joachim Werther

Friedrich R Faulhaber

Jozef Oostvogels

Paul Pijl

Josef Beullens

Helmut Buchaeckert

Donald R Johnson

Emile DeDecker

David Weatherford

David Agab

Alan Handerman

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

Caprolactam is obtained from caprolactam-containing polymers in the presence of a base under reduced pressure by depolymerizing polymers which contain the repeating unit --[--N(H)--(CH.sub.2).sub.5 --C(O)--] or mixtures consisting essentially of

Obtaining caprolactam by cleavage of molten polycaprolactam

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

Recovery of caprolactam and of an alkali metal carbonate from distillation residues which are obtained in the purification of caprolactam and contain caprolactam and/or oligomers and/or polymers of caprolactam and also alkali metal hydroxides by

Recovery of caprolactam from distillation residues obtained in the

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

A process for the preparation of hydroxylammonium salts by the reduction of nitrogen oxide (NO) with hydrogen in dilute aqueous mineral acid in the presence of a suspended platinum catalyst which is partially poisoned with arsenic, at elevated temperature, wherein the catalyst used is one which has been produced by precipitation of metallic platinum from an aqueous solution on to a suspended support in the presence of an oxidic arsenic compound, by means of a reducing agent.

Preparation of hydroxylammonium salts

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 method of regenerating noble metal catalysyts used for the catalytic reduction of nitrogen oxide with hydrogen, wherein the noble metal catalyst is treated with an aqueous alkaline solution having a pH of more than 9.

Method of regenerating inactive and poisoned platinum catalysts

Growing community of inventors

Ludwigshafen, Germany

Hugo Fuchs