Bayer Aktiengesellschaft

Solarworld Aktiengesellschaft

Agfa-gevaert Ag

Hans-Dieter Block

Rainer Weber

Norbert Lonhoff

Hans-Heinrich Moretto

Helmut Klotz

Roland Kleinstuck

Johannes-Peter Schäfer

Hans-Joachim Leimkühler

Uwe Arndt

Dieter Freitag

Reinhard Schliebs

Bernhard Spreckelmeyer

Hans D Pinter

Peter Schmidt

Wolfgang Ohlendorf

Kuno Wagner

Walter Schafer

Klaus Pohmer

Christoph Holzner

Michael Batz

Bernd Rosenow

Dirk Müller

Uwe Brekau

Manfred Schmidt

Ludwig Bottenbruch

Klaus Reinking

Andreas Bulan

Volker Serini

Leslaw Mleczko

Georg Ronge

Stephan Klein

Rainer Bellinghausen

Harry Rohr

Hans Rinkes

Werner Ludovici

Heinrich Helker

Werner Dick

Ludwig Schmidt

Bernd Makowka

Peter Schober

Wolfgang-Hans Schulz-Schlitte

Jost Halstenberg

Michael Immenkeppel

Wolfgang Behrenz

Karl-Heinz Ott

Wolfgang Podszun

Karsten-Josef Idel

Josef Witte

Friedemann Muller

Jens Winkel

Jurgen Kirsch

Klaus Walz

Heinrich Heine

Michael Muller

Karl Fuhr

Bernhard Schulte

Gerd Fengler

Sigurd Buchholz

Gebhard Wagner

Udo-Winfried Hendricks

Peter Vehlewald

Gunter Arend

Wolfgang Konter

Karl Frank

Knud Werner

Gerhard Winter

Dietrich Pantke

Andreas Nickel

Paul J Mayska

Friedrich Schwochow

Hermann Sicius

Bernd Urbanneck

Peter Schreckenberg

Herbert Kallfass

Werner Ballas

Hans-Georg Nieder-Vahrenholz

Hans Dahmen

Udo Kräuter

Hans-Gunther Frohlen

Hans-G Unter Fr Ohlen

Paul Strehlow

Alfred Wagner

Cornelia Dorzhach-Lange

Herbert Odenbach

Cornelia Lensch

Torsten Sill

Dietmar Schwanke

Ulrike Strauss

Dawie Van Der Merre

Roland-Luiz Roth

Michael Lumm

The invention relates to a method of producing silane or hydrochlorosilanes by disproportionation of a higher chlorinated hydrochlorosilane or a mixture of said hydrochlorosilanes in the presence of a catalyst. Before the catalyst is used, it is a) washed with hyper-pure water in one or several steps; b) transferred in the water-moist state to the reactor in which the disproportionation is to proceed; c) treated in the reactor with boiling methanol or rinsed with anhydrous methanol; and d) the methanol is removed from the catalyst by evacuation and/or stripping with inert gas. The invention further relates to a method for treating disproportionation catalysts.

Method for producing silanes

Process wherein the vanadium present in the chromium ore chromite is recovered as vanadium pentoxide during the course of the fusion of the chromium ore with alkali and its work-up to produce sodium chromate solution and sodium dichromate.

Process for the utilization of vanadium from chromium ore as vanadium (V) oxide

The invention relates to a method and a device for producing globular grains of high-purity silicon by atomising a silicon melt () in an ultrasonic field (). Globular grains having a grain size of 50 &#x3bc;m can be produced by means of said method and device and can be used to separate high-purity silicon from silane in the fluid bed. The silicon melt () is fed into the ultrasonic field () at a distance of &#x3c;50 mm in relation to a field node, and the atomised silicon leaves the ultrasonic field () at a temperature close to the liquidus point. The invention also relates to a use of the product produced according to the inventive method or using the inventive device, as particles for producing high-purity silicon from silane in a fluid bed.

Method and device for producing globular grains of high-puroty silicon having a diameter of between 50 &#x3bc;m and 300 &#x3bc;m and use of the same

Silane is produced in a continuous process by disproportionating trichlorsilane in at least 2 recreation areas for reaction/distillation, which are run through by a countercurrent of steam and liquid in the presence of catalytically active solid under a pressure which ranges between 500 mbar and 50 bar.

Method and facility for producing silane

This invention relates to a continuous process for the preparation of silane by catalytic disproportionation of trichlorosilane in a reactive/distillative reaction zone having a catalyst bed of catalytically active solid.

Method and system for producing silane

The invention relates to a method for the production of high purity silicon, characterized by the following steps: a) reaction of metallic silicon with silicon tetrachloride (SiCl), hydrogen (H) and hydrochloric acid (HCl) at a temperature of 500 to 800&#xb0; C. and a pressure of 25 to 40 bar to give a trichlorosilane-containing (SiHCl) feed gas stream, b) removal of impurities from the resultant trichlorosilane-containing feed gas stream by scrubbing with condensed chlorosilanes at a pressure of 25 to 40 bar and a temperature of 160 to 200&#xb0; C. in a multi-stage distillation column, to give a purified trichlorosilane-containing feed gas stream and a solid-containing chlorosilane suspension and a distillative separation of the purified feed gas stream into a partial stream essentially comprising SiCland a partial stream, essentially comprising SiHCl, c) disproportionation of the SiHCl-containing partial stream to give SiCland SiH, whereby the disproportionation is carried out in several reactive/distillative reaction zones, with a counter-current of vapour and liquid, on catalytic solids at a pressure of 500 mbar to 50 bar and SiHClis introduced into a first reaction zone, the lower boiling SiH-containing disproportionation product produced there undergoes an intermediate condensation in a temperature range of &#x2212;25&#xb0; C. to 50&#xb0; C., the non-condensing SiH-containing product mixture is fed to one or more further reactive/distillative reaction zones and the lower boiling product thus generated, containing a high proportion of SiHis completely or partially condensed in the head condenser and d) thermal decomposition of the SiHto give high purity silicon.

Method for production of high purity silicon

The invention relates to a method for producing silane (SiH) by a) reacting metallurgical silicon with silicon tetrachloride (SiCl) and hydrogen (H), to form a crude gas stream containing trichlorosilane (SiHCl) and silicon tetrachloride (SiCl), b) removing impurities from the resulting crude gas stream by washing with condensed chlorosilanes, c) condensing and subsequently, separating the purified crude gas stream by distillation, d) returning the partial stream consisting essentially of SiClto the reaction of metallurgical silicon with SiCland H, e) disproportionating the partial stream containing SiHCl, to form SiCland SiHand f) returning the SiHformed by disproportionation to the reaction of metallurgical silicon with SiCland H, the crude gas stream containing trichlorosilane and silicon tetrachloride being liberated from solids as far as possible by gas filtration before being washed with the condensed chlorosilanes. The washing process with the condensed chlorosilanes is carried out at a pressure of 25 to 40 bar and at a temperature of at least 150&#xb0; C. in a single-stage distillation column and is carried out in such a way that 0.1 to 3 wt. % of the crude gas stream containing trichlorosilane and silicon tetrachloride is recovered in the form of a condensed liquid phase consisting essentially of SiCl, this liquid phase then being removed from the SiClcircuit and expanded to a pressure of 1 bar outside said SiClcircuit and cooled to a temperature of 10 to 40&#xb0; C., whereby dissolved impurities separate out and are then removed by filtration.

Method for producing silane

The invention relates to a method for removing anhydrous acids and hydrohalogens from trichlorosilane by contacting the trichlorosilane with solid bases. The invention further relates to the use of the trichlorosilane so purified in the production of silane and/or super-pure silicon.

Method for purifying trichlorosilane

A process is provided for the preparation of aqueous silica sols having a particle size of 27 to 72 nm. by adding fresh acidic silica sol into the reactors of a multi stage cascade reactor wherein the reactors contain aqueous solution of colloidal silica sol of a pH of 8 or above. Each successive stage of the cascade reactor is supplied with overflow from the preceding stage. Alkaline compounds, such as alkaline sodium silicate solution, alkaline potassium silicate solution, sodium hydroxide solution or potassium hydroxide solution, are introduced into the first reactor or first reactors so that a pH value in the range of 8 to 12.5 is established in the reactors.

Continuous preparation of silica sols which contain large particles

The present invention relates to a process for producing low-salt silica sol dispersions in low-boiling alcohols and to the use of the organosols obtained by this process for the production of coatings on metallic and nonmetallic substrates.

Process for producing low-salt silica sol dispersions in low-boiling

This invention relates to a process for the production of symmetrical trialkyl phosphites, which are also known as phosphorus acid trialkyl esters, from phosphorus trichloride and alcohol in the presence of an auxiliary base as an acid-binding agent and a solvent.

Process for the production of trialkyl phosphites

Use of diethyl dodecylphosphonate (DEDP) for the extraction of acids and metal salts from aqueous solutions.

Extraction of acids and metal salts from aqueous solutions with diethyl

A method for the decomposition of chromium ore in a directly heated revolving tube is described, in which oxygen-containing gases are introduced into the revolving tube by means of below-bed nozzles.

Method for manufacturing alkali chromates from chromium ore

This invention relates to an improved process for the production of 2-phosphono-butane-1,2,4-tricarboxylic acid (PBTC) and the alkali metal salts thereof, in which process dialkyl phosphite, preferably dimethyl or diethyl phosphite, and ethene-1,2-dicarboxylic acid dialkyl ester, in particular the dimethyl or diethyl ester of maleic acid and/or fumaric acid, are initially reacted in the presence of a basic catalyst to yield a phosphonosuccinic acid tetraalkyl ester, the resultant ester is thereupon reacted without further working up with acrylic acid alkyl ester, preferably methyl or ethyl acrylate, in the presence of an alkaline catalyst and the reaction product obtained in this manner is saponified without further working up to yield PBTC or the alkali metal salts thereof. The product when mixed with bleaching lye exhibits reduced chlorine depletion.

Production of 2-phosphonobutane-1,2,4-tricarboxylic acid and the alkali

A process for the recovery by distillation of tributyl phosphate (TBPO) from spent hydraulic oils, which are employed particularly in aircraft used for civilian air traffic.

Process for the recovery of tributyl phosphate from spent hydraulic oils

Growing community of inventors

Leverkusen, Germany

Hans-Dieter Block