Basf Aktiengesellschaft

Basf Chemicals Limited

Guenter Herrmann

Juergen Hartig

Gert Buerger

Armin Stoessel

Laszlo Marosi

Heinrich Aichinger

Elmar Frommer

Otto-Alfred Grosskinsky

Klaus Herzog

Hermann Wistuba

Hans-Dieter Eichhorn

Ekhart Lucas

Peter Zehner

Matthias Schwarzmann

Stefan Karbach

Thomas Fetzer

Siegfried Winderl

Lothar Karrer

Wolfgang Reiss

Juergen Paetsch

Peter Magnussen

Karl-Heinz Boehning

Rolf Schnabel

Gunter Schuch

Wolfgang Buechele

Gerhard Frank

Dieter Stuetzer

Ruediger Schmitz

Jost H Manegold

Claus Witte

Jurgen Hartig

Arthur Brunner

Ulrich Loeffler

Martin J Dancey

James W Steen

Catalytic decomposition of dinitrogen monoxide

A process for regenerating deactivated metal oxide catalysts comprising at least one of the elements antimony, iron, bismuth, molybdenum, vanadium, tungsten and/or uranium and a peptizable carrier, comprises the steps of:

Regeneration of metal oxide catalysts

A catalyst for decomposing dinitrogen monoxide which is pure or present in gas mixtures comprises metallic silver applied to an alumina carrier with a BET surface area of from 5 to 25 m.sup.2 /g.

Catalytic decomposition of dinitrogen monoxide which is pure or present

A process for working up mother liquors resulting from the preparation of adipic acid by oxidation of cyclohexanol or cyclohexanone or mixtures thereof with nitric acid entails removal of nitric acid by azeotropic distillation with water, heating the resulting melt at from 130.degree. to 180.degree. C. and then dissolving it in water, treating the aqueous solution with cation exchangers, subsequently again evaporating off the water and heating the resulting dicarboxylic acid melt at from 200.degree. to 240.degree. C. and then obtaining a mixture of dicarboxylic acids by distillation.

Workup of mother liquors resulting from the preparation of adipic acid

Acrylonitrile is prepared by a process which comprises the ammoxidation of propylene with ammonia and molecular oxygen or a gas containing molecular oxygen at from 300.degree. to 600.degree. C. in the presence of a metal oxide catalyst which contains tellurium and one or more of the metals iron, molybdenum and antimony, in a fluidized bed, with regeneration of the catalyst during the reaction by the addition of oxidic tellurium compounds or tellurium compounds which form oxidic tellurium compounds under the reaction conditions, in dissolved or suspended form.

Preparation of acrylonitrile

Solutions of molecular oxygen in liquid hydrocarbons are prepared by bringing a liquid hydrocarbon into contact with molecular oxygen under superatmospheric pressure in a vertical absorption zone, by a process in which

Preparation of solutions of molecular oxygen in liquid hydrocarbons

Aqueous acidic scrubbing liquors obtained when oxidation mixtures from the oxidation of cyclohexane are scrubbed with water are stabilized by a process in which the scrubbing liquors are heated at from 50.degree. to 130.degree. C. in the presence of a water-soluble vanadium compound.

Stabilization of aqueous acidic scrubbing liquors

Reaction mixtures which contain cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone and are obtained by oxidizing cyclohexane with molecular oxygen, or a gas containing this, in the liquid phase at from 130.degree. to 200.degree. C. under from 5 to 25 bar are worked up by treatment with an aqueous alkali solution in the presence of a cobalt salt at elevated temperatures by an improved process wherein a phosphonic acid compound of the formula ##STR1## where X is alkylene or 2 to 6 carbon atoms, R.sub.1 is --CH.sub.2 PO.sub.3 H and R.sub.2, R.sub.3 and R.sub.4 may be identical or different and are each --CH.sub.2 PO.sub.3 H, --CH.sub.2 OH, hydrogen or alkyl of 1 to 4 carbon atoms, is concomitantly used.

Working up reaction mixtures containing cyclohexyl hydro-peroxide,

Oxygen-containing compounds are prepared by oxidizing a hydrocarbon in the liquid phase with a gas containing molecular oxygen, at elevated temperatures and under superatmospheric pressure, by a continuous process in which the said gas is fed into the liquid reaction mixture, in a downward direction, at several points along the reaction zone via nozzle apertures, so that it emerges at each nozzle aperture with a velocity of from 0.01 to 1 m/sec in an amount of from 0.001 to 10 liters per second per nozzle aperture, and the said reaction mixture is brought into substantially uniform contact with the gas containing molecular oxygen, over the volume of the reaction zone.

Continuous preparation of oxygen-containing compounds

Cyclohexanol and cyclohexanone are prepared by treating cyclohexyl hydroperoxide with a supported catalyst containing from 2 to 30% by weight, calculated as cobalt, of cobalt in oxidic form, at from 30.degree. to 160.degree. C., by a process wherein a zeolite is used as the carrier.

Preparation of cyclohexanol and cyclohexanone

Supported catalysts containing from 2 to 30% by weight, calculated as cobalt, of cobalt in oxidic form on a zeolite carrier, and their preparation.

Cobalt-containing supported catalysts and their preparation

The hydrogenation of carboxylic acids having 6 or less C atoms, as obtained as by-products of cyclohexane oxidation, to give corresponding diols is improved by the addition of a small amount of phosphoric acid or a phosphoric ester before hydrogenation.

Preparation of diols

A process for working up reaction mixtures containing cyclohexanol and cyclohexanone, which have been obtained by oxidizing cyclohexane with molecular oxygen or gases containing molecular oxygen, in the liquid phase, at from 130.degree. to 200.degree. C. under a pressure of from 5 to 25 bars, working-up being effected by treatment with aqueous solutions of an alkali metal hydroxide and/or alkali metal carbonate in two stages, the fresh aqueous alkali metal hydroxide and/or alkali metal carbonate solution being fed to the second stage and the separated-off spent alkali being brought into contact with fresh reaction mixture in the first stage. The treatment in the first stage is carried out in the presence of inert gases and the inert gases are separated off before the second stage.

Working-up of reaction mixtures containing cyclohexanol and cyclohexanone

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Heidelberg, Germany

Guenter Herrmann