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Deutsche Gold- Und Silber-scheideanstalt Vormals Roessler

Degussa - Huls Ag

Degussa Gmbh

Degussa Akteingesellschaft

Degussa-h{umlaut Over (u)}ls Aktiengesellschaft

Peter K Kleinschmit

Peter Panster

Akos Kiss

Rudolf Schwarz

Ulrich Deschler

Siegfried Wolff

Dietrich Speer

Hans Strack

Carl Voigt

Dieter Kerner

Michael Baacke

Wolfgang Buder

Helmut Mangold

Rudolf Michel

Dieter Binder

Edgar Koberstein

Roland Reuter

Werner Volker

Gunter Halbritter

Klaus Zetzmann

Alfons Karl

Reinhard Manner

Werner Hartmann

Jenny Horst

Ewe-Hong Tan

Gerhard Sextl

Gangolf Kriechbaum

Klaus Deller

Eckehart Roland

Gerhard Birtigh

Robert Gradl

Horst Grethe

Jens Weitkamp

Sabine Schmidt

Stefan Ernst

Hans Hoffmeister

Thomas Kromminga

Thomas Bock

Christa Liedtke

Doris Peuckert

Bernd Engler

Friedrich Bittner

Manfred Ettlinger

Mustafa Siray

Manfred Voll

Ehrfried Parr

Elfriede Sextl

Ralf Janda

Marion Lotze

Juergen Hanich

Reinhard Klingel

Hans-Juergen Klockner

Reinhold Reck

Alan Parkhouse

Guenter Halbritter

Ingo Pauli

Thomas Rudolph

Eberhard Walter

Anh T Liu

Jurgen Dorr

Christel Zell

Dietrich Arntz

Gerd Schreyer

Rainer Domesle

Guenter Prescher

Werner Will

Reinhold Brand

Ralf Schmoll

Gerhard Kuhner

Alexander Ruhs

Frank Heindl

Peter Albers

Richard Engel

Johannes Ohmer

Thomas Goebel

Hans Mehner

Karl-Heinz Koenig

Michael Witzel

Georg Hellwig

Wolf-Dieter Pfeifer

Ilona Sporys

Ilona Fuss

Helmut Mechler

Gunter Theis

Brigitte Meiners

Lothar Schmidt

Gerhard Sperka

Sabine Gliem

Karl Voigt

Hermann Gottschlich

Detlev Koth

Roland Kutz

Erwin Walter

Marlies Englisch

Detley Koth

Martin Foerster

Reinhold Beand

Pyrogenically, especially flame-hydrolytically produced zirconium dioxide powder with a specific surface area between 20 and 200 m /g, a primary particle size between 7 and 100 nm, a tamped density of the deacidified and non-deacidified zirconium dioxide between 40 and 150 g/l with Sears numbers of the deacidified and non-deacidified zirconium dioxide between 1 and 20 ml/2 g and with a chlorine content of the deacidified zirconium dioxide less than 0.6% by weight. These are produced by evaporating zirconium halides, mixing the vapors alone or together with a carrier gas in a burner with air, oxygen, nitrogen and hydrogen, causing the gases to react with each other in a flame in a closed burner chamber, cooling off the waste gases and the zirconium dioxide in a heat exchanger unit, separating the waste gases from the zirconium dioxide and removing any halide remnants adhering to the zirconium dioxide by a heat treatment with moistened air.

Zirconium dioxide powder, method of its production and use

A boron oxide-silicon dioxide mixed oxide which has a BET surface of less than 100 m,g, and optionally containing oxides of aluminium, titanium or zirconium, is prepared pyrogenically by flame hydrolysis. The mixed oxide is used in glass making.

Boron oxide-silicon dioxide mixed oxide

Disclosed is a method for the purification of exhaust air and/or effluents, which may be exhausted, for example, from auto painting units or furniture lacquering units, involving contacting the air and/or effluents with a molded body. The molded body is made from dealuminated zeolite Y and at least one binder, which may be, for example, bentonites, kaolins, sepiolites or attapulgites, and having a hydrophobic factor of from 1.5 to 6.0, wherein a slurry of the binder in water does not exceed a pH of 10 and wherein the molded body is calcined at 850&deg; to 1100&deg; C. The molded body is produced by a process involving mixing pulverulent dealuminated zeolite Y with at least one binder, optionally with the addition of a lubricant and/or a pore former, and optionally with water or an organic solvent, moulding the resulting mass to form a molded body, and drying and calcining the molded bodies.

Method for the purification of exhaust air and/or effluents by contact with moulded bodies containing dealuminated zeolite Y

A boron oxide-silicon dioxide mixed oxide which has a BET surface of less than 100 m.sup.2 g, and optionally containing oxides of aluminium, titanium or zirconium, is prepared pyrogenically by flame hydrolysis. The mixed oxide is used in glass making.

Pyrogenically produced silica having a specific surface of less than 90 m.sup.2 /g, preferably of less than 60 m.sup.2 /g, and a DBP absorption of less than 60 wt. % (less or equal to 57.30 ml dibutyl phthalate/100 g) is produced by vaporizing silicon halides and/or organosilicon halides, mixing the vapors with a carrier gas, heating the mixture to temperatures definitely above the boiling point of the silicon-halogen compound, mixing with hydrogen and combustion in a known manner in a burner.

Pyrogenic silica, process for the production thereof and use

Thermally split zirconium silicate is produced such that the crystalline zirconium dioxide embedded in an amorphous silica phase exhibits an average grain or particle size (d.sub.50 value) in a range of 0.5 .mu.m to 3.0 .mu.m and a specific surface (BET) in a range of 3 to 15 m.sup.2 /g. The zirconium dioxide produced by this method is particularly suited for the production of zirconium silicate pigments with improved color characteristics. The thermally split zirconium silicate is also particularly well suited for processes used in the obtention of zirconium dioxide. The method of producing the thermally split zirconium silicate includes melting zirconium silicate in an induction melting furnace and cooling off a free falling stream of melt by blowing on it with a gas and/or spraying it with water.

Thermally split zirconium silicate, method of its production and use

Molecular sieves are modified by an ion exchange process where metal cations are introduced into the molecular sieves by means of solid state ion exchange. The solid state ion exchange can be carried out as follows: a weighed amount of calcined and activated zeolite is intimately mixed with a precalculated amount of PtCl.sub.2, PdCl.sub.2, RhCl.sub.3, CuCl.sub.2, V.sub.2 O.sub.5 or another compound of the noble metals (e.g., corresponding halides or oxides), the solids mixture is then heated in a current of inert gas (e.g., a current of helium gas or of nitrogen) to temperatures of 400.degree. to 600.degree. C., then cooled down to room temperature and subsequently reduced in a current of hydrogen for 10 to 14 hours at 280.degree. to 350.degree. C. in order to produce small metal clusters from the cationically introduced metal.

Method of modifying molecular sieves by means of solid state ion

Modified molecular sieves by means of solid ion exchange

A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In the method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products. A device for periodic melt broaching as well as an induction melting furnace equipped with an intensively coolable run-out channel provides apparatus for carrying out the above method.

Method and apparatus for the semi-continuous melting and discharging of

Several method is of preparing formed spherical polymeric complexes of metals of the 8th subgroup of the periodic system with ligands of an organosiloxane copolycondensate optionally cross-linked by means of cross-linking agents containing Si, Ti, Zr and/or Al (statistical, block-shaped or mixed) with special posttreatment stages are described.

Formed, polymeric transition-metal complex catalysts with organosiloxane

Method of modifying molecular sieves by means of solid state ion exchange

A method is disclosed for the semi-continuous melting of ceramic material by means of inductive melting in high-frequency and medium-frequency induction melting furnaces whose melting coil surrounds a sintering crust crucible and contains a run-out channel. In tile method, melt is periodically run out and material to be melted is supplied to the crucible so as to replace the material removed preferably so as to maintain a constant level. An intensively cooled channel is used as a run-out device. For the melt broaching, the melt nose is grasped from below by way of an automatically controllable broaching lance of a broaching device and raised. The broaching lance is then advanced between the bottom of the channel and the solidified melt until the sintering crust is pierced. The method permits a reliable and economic management of the process and the maintenance of the quality of the melted products. A device for periodic melt broaching as well as an induction melting furnace equipped with an intensively coolable run-out channel provides apparatus for carrying out the above method.

Silicon-aluminum mixed oxide powder which is flamehydrolytically produced and has a composition of 65 to 85% by weight Al.sub.2 O.sub.3, remainder SiO.sub.2 and an amorphous structure, in which each primary particle contains components of SiO.sub.2 and of Al.sub.2 O.sub.3, the primary particles are between 7 and 80 nm, preferably 10 and 40 nm in size and the specific surface of the powder is between 20 and 200 m.sup.2 /g. The powder is used for the production of mullite and sintered compacts manufactured from it.

Silicon-aluminum mixed oxide

Heat insulator and method of making it

Silicon-aluminum mixed oxide powder which is flame-hydrolytically produced and has a composition of 65 to 85% by weight Al.sub.2 O.sub.3, remainder SiO.sub.2 and an amorphous structure, in which each primary particle contains components of SiO.sub.2 and of Al.sub.2 O.sub.3, the primary particles are between 7 and 80 nm, preferably 10 and 40 nm in size and the specific surface of the powder is between 20 and 200 m.sup.2 /g. The powder is used for the production of mullite and sintered compacts manufactured from it.

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Hanau, Germany

Peter K Kleinschmit