Bayer Aktiengesellschaft

Solarworld Aktiengesellschaft

Hilti Aktiengesellschaft

Bayer Materialscience Ag

Heiko Herold

Edgar Muschelknautz

Leslaw Mleczko

Axel Wollenschlager

Volker Michele

Matthias Pfaffelhuber

Alfred Von Schuckmann

Fritz Gestermann

Herbert Stutz

Hans Uhlemann

Rudolf J Klee

Franz-Josef Mersmann

J&uuml;rgen Schneider

Reinhard Boeck

Hans Lenz

Friedrich Haendeler

Günter Holdenried

Theo König

Hans Daun

Richard Herold

Wolfgang Podszun

Jens Winkel

Rainer Neumann

Frieder Heydenreich

Peter Schwabe

Alfred Eitel

Steffen K&uuml;hling

Tony Van Osselaer

Hans-Dieter Pinter

Rolf Lanze

Werner Finger

Rainer Bellinghausen

Roland Vogelsgesang

Walter Horstmann

Benno Franz Ulfik

Hans-Josef Behrens

Franz Schmitt

Klaus Schebesta

Michael Dauben

Martin Friedrich

Kurt Bernklau

Reiner Diederich

Norbert Schweigler

Guenther Sanchen

Claus Riehle

Matthias Herboth

Stefan Hofmann

Karl-Ludwig Metzger

Lutz Georgias

Roland Kleissendorf

Werner König

Hans-Joachim Brockhaus

Mathias Benz

Willi Potes

Karl-Theodor König

Hans-Georg Janssen

Barbara Schulte

Andre Fellholter

Frank Behrendt

Renate Heid

Harald Landen

Ahmed Hegazy

Marc Jenne

Jorg Rainer Schmitz

H Günter Holdenried

Kunz Brunner

A process for preparing isocyanates in the gas phase, in which the mixing of the reactants and thus the reaction conditions are significantly improved by means of hydrodynamic measures such as increasing the turbulence of the feed stream in the central nozzle. As a consequence, the necessary residence time in the reactor and thus the length of the reactor are reduced and the formation of polymeric by-products which lead to caking in the reactor and a shortening of the operating period of the reactors is avoided.

Process for preparing isocyanates in the gas phase

The present invention relates to a method for producing highly pure, granular silicon with a narrow particle-size distribution by decomposing silanes or halosilanes in a fluidised bed and epitaxially growing silicon on silicon seed particles, which method is characterised in that the gas containing silicon is supplied to the reaction chamber in an upward flow and the contents of the fluidised bed are separated in a continuous or discontinuous manner, whereby a particle stream from the fluidised bed is supplied to a separator mounted outside the fluidised bed, particles of the desired size are separated and undersized particles are returned to the fluidised bed. The invention also relates to a device and the use thereof for carrying out said method.

Method for producing highly pure, granular silicon in a fluidised bed

A cyclone separator () for use in a suction apparatus () of a hand-held power tool () includes a dirty air inlet (), a suction ventilator () for aspirating, through a suction opening () which is connected with the dirty air inlet (), abrasion particle-carrying suction air, a pure air outlet for letting out purified air, a vortex chamber () arranged between the dirty air inlet () and the pure air outlet, with the dirty air inlet () opening substantially tangentially into the vortex chamber () for generating a swirling stream in a direction toward the pure air extraction element (), a collection chamber (), and particle outlet having at least two particle outlet openings and connecting the vortex chamber with a collection chamber (), with the dirty air inlet opening into the vortex chamber between the two particle outlet openings.

Cyclone separator

A device for electrically heating a vertically erect chamber comprising several heating zones arranged vertically one above the other. The components of the device, with the exception of the insulating components, are made from graphite materials. Each zone (Z) comprises a number of supports (), arranged in an essentially even distribution around the chamber for heating, which simultaneously serve as electrical supplies for the heater, and the heater for each zone (Z) is fixed at one end and longitudinally displaceable at the other end.

Device for electrically heating a vertically erect chamber

The invention relates to a method for producing hyper-pure, granular silicon by decomposing a gas containing silicon in a reactor consisting of a silicon carbide-based, carbon-fiber reinforced material; to a corresponding reactor; and to the use of said reactor for producing silicon.

Method for producing highly-pure granular silicon

Isocyanates are produced in the gas phase in a manner such that temperature fluctuations over time and temperature distribution asymmetry are prevented. In this improved process, performance of the reaction in tubular reactors is accomplished by flow-related measures such as homogenization and centering of the educt streams. The formation of polymeric secondary products, which result in baked-on deposits in the reactor and a reduction in reactor service life, is consequently prevented.

Process for the production of isocyanates in the gas phase

The present invention provides a process for quenching a gaseous reaction mixture during the phosgenation of diamines in the gas phase to produce diisocyanates. The gaseous reaction mixture contains at least a diisocyanate, phosgene and hydrogen chloride. The quenching liquid is injected into the gas mixture continuously flowing out of a cylindrical reaction zone into the downstream cylindrical quenching zone with the aid of at least two spray nozzles which are arranged at the entrance to the quenching zone at equal distances along the circumference of the quenching zone.

Process for quenching a gaseous reaction mixture during the gas phase phosgenation of diamines

A method for producing bisphenol A in prill form is disclosed. Molten bisphenol is top-fed into a prilling tower via a plate containing a plurality of nozzles. A gas coolant guided through a circuit is led into said tower in a counter flow direction. The prills are cooled to about room temperature, collected at the bottom of the tower and removed. Also disclosed is the device for carrying out the inventive method and the prills thus produced.

Method and device for producing bisphenol a prills and bisphenol a prills produced according to this method

The present invention relates to a process for the continuous discharge of pre-classified polymer particles, particularly rubber particles, from a gas phase polymerization reactor, comprising the steps of classifying the polymer in a classifier, discharging the particles with a sufficient size and conveying the undersized particles back into the gas phase polymerization reactor.

Gas-phase polymerization in a bell-shaped reactor

Method and device for extracting rubber from gaseous phase polymerization

Pump for hot corrosive melts

The process for producing crystallisation products with an average particle diameter of &lt;1 .mu.m is based on the atomisation of a solution and the simultaneous evaporation of the solvent. The atomised solution A crystallises in a gas atmosphere, in which it is simultaneously contacted with a cloud of drops 4 of a surfactant-containing liquid B, thus forming an aerosol mixture A, B which is then deposited in the form of a colloidal crystal suspension in which the surfactant-containing liquid B forms the continuous phase. The cloud of drops 4 of the surfactant-containing liquid can also be produced by atomisation.

Process for producing ultrafine-crystallization products

The invention relates to an electrochemical half-cell (1) with a gas diffusion electrode (7) as cathode or anode wherein the gas chamber (6) is divided in particular into two or more gas pockets (6a, 6b, 6c) arranged one above another, the electrode chamber (2) of the half-cell (1) being divided into compartments (2a, 2b, 2c) which for the passage of the electrolyte (23), are connected to one another in cascade fashion via chutes (17), (18), (19).

Electrochemical half-cell

The precipitation system comprises a collection tube (1) which can be fitted onto the powder inhaler with a mouthpiece (3) and a centrifugal precipitator (2,6) arranged in the collection tube (1). This centrifugal precipitator has at least one spin-producing surface (2) which produces a spin flow in the collection tube (1), as a result of which the heavy coarse powder particles are precipitated on the inner wall of the collection tube (1) while the lighter fine powder particles pass into the mouthpiece (3) due to a flow which is essentially restricted to the area surrounding the tube axis.

Precipitation system for a powder inhaler

In the process for the continuous collection of pulverulent or dusty samples from a particle-laden stream, a sample stream is drawn off from a particle-laden main stream in a pneumatic conveying line 17 and passed via a collection line 9 to a particle size measurement device 10. In order to reduce spin, the main stream in the conveying line 17 is passed through a venturi-like cross-sectional constriction 3, 4, 5, the cross-sectional area of which is 10 to 60% of the free cross-sectional area of the conveying line 17. Samples are then collected downstream from the cross-sectional constriction through one or more probe tubes 7, wherein a partial stream is collected from the main stream parallel to the direction of flow thereof. In conjunction with a jet mill 14, into which the product to be ground and the propellant air are continuously introduced, the particle size distribution measured in the continuously collected sample stream may be used as a control parameter in order to adjust a parameter which determines particle size distribution of the jet mill 14 in such a manner that the particle size distribution in the product stream remains constant.

Process for sampling in particle-laden gas streams

Growing community of inventors

Neuss, Germany

Heiko Herold