Basf Aktiengesellschaft

Christopher William Rieker

Alfred Hagemeyer

Norbert Neth

Joaquim Henrique Teles

Klaus Ebel

Hartmut Hibst

Hermann Gausepohl

Norbert Rieber

Martin Fischer

Klemens Massonne

Heinz-Walter Schneider

Dieter Hermeling

Manfred Stroezel

Thomas Fetzer

Eugen Gehrer

Dirk Demuth

Michael Baier

Hermann Petersen

Michael Jolyon Sprague

Klaus Breuer

Otto Hofstadt

Ruprecht Meissner

Otto Kumberger

Hans Christoph Horn

Lorenz Siggel

Thomas Lautensack

Werner Hebgen

Wolfgang J&uuml;rgen P&ouml;pel

Christoph Gahn

Wolfgang Buchele

Wolfgang Jurgen Popel

Peter Mark Allen

Robert Wagner

Marco Millies

Jurgen Schroeder

An apparatus and a process for crystallizing substances from solutions or dispersions containing these substances, in a crystallizer containing a classifying zone (), comprise The novel apparatus has the special feature that a line () connecting the outer and inner circulation systems () to one another and intended for transporting (recycling) dispersion and/or a line () for transporting (recycling) dispersion are additionally present, in which both its entrance and its exit are connected to the inner circulation system ().

Process for producing crystals

A process for preparing 1,2-dichloroethane by reacting about 2 mols of ethylene, about 4 mols of hydrogen chloride and about 1 mol of oxygen in the presence of a fixed bed of supported catalyst based on copper(II) chloride in only one reaction zone at a pressure of from 2 to 10 bar and at from 220 to 280&deg; C., separating off 1,2-dichloroethane and water from the reaction mixture emerging from the reaction zone and passing most of the exhaust gas back into the reaction zone, where, prior to entry into the reaction zone, the exhaust gas is mixed with ethylene, hydrogen chloride and oxygen, and the oxygen content of the mixture does not exceed 7% by volume, and where the ethylene content of the gas mixture entering into the reaction zone is regulated so that the exhaust gas comprises less than 20% by volume of ethylene, where the supported catalyst used is obtained by tableting a mixture of pseudoboehmite and &ggr;-Al O in a weight ratio from 4:1 to 1:4, if desired with addition of tableting auxiliaries, loading this support with the active components by saturating with a CuCl /KCl solution so that the copper content is from 1 to 15% by weight and the potassium content is from 0.1 to 8% by weight, based in each case on the total weight of the catalyst, and then drying the catalyst at from 60 to 400&deg; C.

Supported catalyst containing pseudo-boehmite and &ggr;-Al2O3, production of same and its use for producing 1,2-dichloroethane

Production of solids by precipitation

Compounds of the formula I and II ##STR1## where R.sup.1 is hydrogen or an aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radical or an acyl radical, it being possible for these radicals to carry further substituents which do not react with acetylenes or allenes, and the radicals R, independently of one another, are hydrogen or aliphatic, cycloaliphatic, araliphatic, aromatic or heterocyclic radicals which may be linked to one another with formation of a ring and m is 0 or 1, are prepared by an addition reaction of a compound of the formula III

Addition reaction of hydroxyl-containing compounds with alkynes or

Method of producing selective-dehydrogenation catalysts, and catalysts

A process for preparing diarylethanes of the general formula I ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 are each hydrogen or C.sub.1 -C.sub.8 -alkyl, by reacting aromatic compounds of the general formula II ##STR2## where R.sup.2, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 have the abovementioned meanings, with styrenes of the general formula III ##STR3## where R.sup.1 has the abovementioned meanings, at from -20 to 300.degree. C. under from 1 to 100 bar in the presence of heterogeneous catalysts, wherein beta-zeolites or mordenites are used as heterogeneous catalysts.

Preparation of diarylethanes

A process for the preparation of unsaturated cyclic ethers of the general formula I ##STR1## in which Z denotes --(CHR.sup.4).sub.q or --(CHR.sup.4).sub.q --O--

Preparation of unsaturated cyclic ethers

A process for the deoxygenation of organic oxo compounds, in particular phosphine oxides to phosphines and nitrobenzene to aniline, with reduced redox catalysts in a non-steady-state reaction with decoupled reductive regeneration of the redox catalyst entails the redox catalyst being reduced to a lower oxidation state and being reused for the deoxygenation.

Reductive deoxygenation using a redox catalyst

Growing community of inventors

Mannheim, Germany

Christopher William Rieker