Basf Aktiengesellschaft

Badische Anilin- & Soda-fabrik Aktiengesellschaft

Matthias Schwarzmann

Wolf D Mross

Wolfgang Hoelderich

Laszlo Marosi

Karl-Heinz Boehning

Franz J Broecker

Richard Krabetz

Franz Merger

Joachim Stabenow

Juergen Plueckhan

Bruno Triebskorn

Michael Hesse

Heinrich Aichinger

Gerd Duembgen

Knut Kaempfer

Guenter Zirker

Eckart Titzenthaler

Juergen Koopmann

Ulrich Hammon

Werner Steck

Helmut Lermer

Herbert Vogel

Fritz Thiessen

Klaus Herzog

Walter Himmel

Volker Vogt

Juergen Dehler

Hans-Juergen Becker

Heinz Dreyer

Winfried Dethlefsen

Klaus-Christian Renner

Rolf Hartmuth Fischer

Heinrich Adolphi

Rudolf Kummer

Toni Dockner

Werner Bertleff

Eberhard Koester

Heinz-Walter Schneider

Wilhelm Ruppel

Uwe Vagt

Hans Martan

Guenter Herrmann

Eduard Schoenafinger

Gert Buerger

Thomas Anstock

Hans-Ulrich Schlimper

Johannes E Schmidt

Ernest Miesen

Hermann Wistuba

Hans-Dieter Eichhorn

Ulrich Lebert

Fritz Naeumann

Walter Scheidmeir

Rolf Seubert

Ewald Gallei

Helmut Glietenberg

Ansgar Eisenbeis

Helmut Schachner

Friedbert Hofmann

Kurt Weinacht

Laslo Marosi

Peter Heinze

Ernst Lorenz

Karl-Heinz Gruendler

Juergen Plueckham

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

Phthalic anhydride is prepared in a multiple tube reactor provided with separate salt baths, the temperature of the salt bath used for cooling the first layer of catalyst, as regarded in the direction of flow of the reaction mixture, being from 2.degree. to 20.degree. C. higher than that of the salt bath(s) associated with the following layer(s).

Preparation of phthalic anhydride from o-xylene

Compositions of the formula Mo.sub.12 P.sub.a V.sub.b X.sup.1 c X.sup.2

5-Methylbutyrolactone is prepared by a process in which a pentenoic ester of the formula I

Preparation of 5-methylbutyrolactone

Compositions of the formula MO.sub.12 P.sub.a V.sub.b X.sup.1.sub.c

A method of isomerizing propargyl alcohol to acrolein, wherein propargyl alcohol is rearranged in the gas phase at a temperature of from 300.degree. to 550.degree. C. and a pressure of from 0.01 to 50 bar and in contact with a heterogeneous catalyst containing alkaline-reacting metal ions, and the use of propargyl alcohol as a depot substance for the liberation of acrolein.

Process for the preparation of acrolein

A process for the preparation of mixtures of isomeric cresols with a molar ratio of para- to meta-cresol of from 0.6:1 to 10:1 by isomerization of cresol mixtures or ortho- and/or metal-cresol on zeolite catalysts of the pentasil type in the gas phase at from 300.degree. to 600.degree. C. under from 0.01 to 50 bar entails the mean particle size of the zeolite catalyst being at leat 3 .mu.m, and the selectivity in the established test for the disproportionation of ethylbenzene to diethylbenzene isomers being at least 60% for para-diethylbenzene.

Preparation of mixtures of isomeric cresols with a molar ratio of para-

Supported silver catalysts which contain one or more alkali metals are prepared in a two-stage process by doping a basic catalyst which contains silver in metallic form and may also contain lithium with the heavy alkali metal sodium, potassium, rubidium and/or cesium using an impregnating solution which contains the heavy alkali metal and one or more nitrates of the general formula

Preparation of a silver catalyst

N-heterocycles of the general formulae (I) and (II) ##STR1## where R.sup.1 and R.sup.4 to R.sup.9 are each hydrogen, alkyl, aryl, aralkyl, alkylaryl or cycloalkyl and R.sup.2 and R.sup.3 are each an alkyl, alkylaryl, substituted alkyl or cycloalkyl group, are prepared by a process in which an olefin of the formula (III) or (IV) ##STR2## where R.sup.2 to R.sup.9 have the above meanings, is reacted with NH.sub.3 or with a primary amine of the formula H.sub.2 NR.sup.1, where R.sup.1 has the above meanings, in the presence of a zeolite as a catalyst.

Preparation of N-heterocycles

Organophosphorus compounds are prepared by reacting an unsaturated compound, such as a striaght-chain, branched or cyclic olefin or a diene having conjugated or nonconjugated double bonds, with a phosphine by a process in which phosphine and/or phosphine-containing compounds are subjected to an addition reaction with the unsaturated compounds in the presence of a solid heterogeneous catalyst. Particularly suitable heterogeneous catalysts are zeolites and phosphates.

Preparation of organophosphorus compounds

A catalytically active composition for the gas phase oxidation of propylene to acrolein and acrylic acid, of the general formula

Preparation of a catalytically active composition for the gas phase

Diamines of the formula ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each hydrogen, alkyl, aryl, alkoxy, aralkyl or cycloalkyl and X is a group of the formula

Preparation of diamines

Tetrahydrofurans are prepared in the gas phase from butane-1,4-diols which may be substituted by alkyl, alkenyl and/or aryl radicals in the carbon skeleton. The reaction is carried out in the presence of a borosilicate and/or iron silicate zeolite, preferably of the pentasil type, as catalyst. Other catalysts which may be used are zeolites doped with alkali metals and/or alkaline earth metals and/or transition metals and/or rare earth metals and/or noble metals.

Preparation of tetrahydrofurans from butane-1,4-diols

Unsaturated nitriles are prepared from lactones and NH.sub.3 by a process in which the reaction of the lactone with NH.sub.3 is carried out in the presence of a zeolite as a catalyst. A particularly suitable starting material is caprolactone and particularly suitable catalysts are zeolites of the pentasil type, for example aluminosilicate zeolites.

Preparation of unsaturated nitriles

A silver catalyst containing lithium and cesium as promoters for the direct oxidation of ethylene with oxygen to give ethylene oxide is applied to a porous carrier and essentially consists of .alpha.-alumina and contains certain amounts of soluble calcium, aluminum, potassium and sodium salts. The carrier has a BET surface area of from 0.4 to 0.8 m.sup.2 /g, a pore volume of not less than 0.45 ml/g, the pores being equally accessible to cold and warm water, a bulk density of less than 700 kg/m.sup.3 and a shape which, in the reactor, provides a geometrical surface area of not less than 600 m.sup.2 /m.sup.3, on which more than 13% by weight of silver are applied as active component and more than 115 kg of silver are available per m.sup.3 of reactor, and from 100 to 300 ppm by weight of lithium and from 200 to 600 ppm by weight of cesium are present as promoters. A process for the preparation of the silver catalyst and its use for the oxidation of ethylene are described.

Silver catalyst and a process for its preparation

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Limburgerhof, Germany

Matthias Schwarzmann