Lanxess International Sa

Bayer Materialscience Ag

Arlanxeo Deutschland Gmbh

Other

Covestro Deutschland Ag

Grifols Therapeutics Inc.

Covestro Intellectual Property Gmbh & Co. Kg

Joachim Ritter

Hanns-Ingolf Paul

Ricarda Leiberich

Udo Wiesner

Rolf Feller

Paul Wagner

John Lovegrove

Jörg Kirchhoff

Holger Luesgen

Friedhelm Steffens

Berthold Keggenhoff

Dietmar Wastian

Adam Gronowski

Andreas Karl Rausch

Hans Georg Grablowitz

Stephan Schubert

Jürgen Münnig

Christian Steffens

Manfred Keller-Killewald

Jorg Kirchhoff

Matthias Böhm

Carsten Kreuder

Christian Hahn

Joerg Kirchhoff

Rainer Buse

Reiner Witkowski

Axel Eble

Sebastian Gripp

Holger Breuer

Sven Gestermann

Marcus Grünewald

Dieter Schmidt

Holger Lusgen

Dieter Ungerer

Alexander Pross

Christian Joachim Hahn

John George Lovegrove

Holger LÜSGEN

John George Arnold Lovegrove

Andreas Rausch

The invention relates to an efficient process for the preparation of isoolefin polymers such as polyisobutene or butyl rubber by polymerization of isobutene and optionally further monomers in the presence of an initiator system prepared by continuously contacting at least one boron or aluminium compound and at least one initiator.

Process for the production of isoolefin polymers with improved initiator system preparation

The application relates to a process for continuously producing aqueous polyurethane dispersions, which is characterized by the use of micro structured mixing elements and addition of water twice during the dispersion step. The energy input in the mixing of the dispersion is low. In addition, the application describes an apparatus suitable for execution of the aforementioned process.

Process and apparatus for continuous production of aqueous polyurethane dispersions

The present invention relates to a tubular reactor () for multi-phase polymerization, in particular for producing butyl rubber, comprising a pipe piece () for radially delimiting a reactor volume between an inlet () and an outlet (), a stirrer () for generating a flow () in the radial direction of the pipe piece (), wherein the stirrer () is dimensioned and operable such that the flow () is impartable with a centrifugal force which generates a concentration distribution in the radial direction inside the pipe piece () and an outlet conduit () for discharging a concentrated radially inner part () of the flow (). Enrichment of polymer particles in the radially inner part () of the flow () avoids gumming of the pipe piece () by the polymer particles so that the risk of a blockage is reduced.

Tubular reactor and method for multi-phase polymerisation

The invention relates to an energy efficient, environmentally favorable process for the preparation of brominated butyl rubbers, that uses a bromination agent and a oxidizing agent in order to enhance the utilization of bromine contained in the bromination agent. In a preferred embodiment a common medium for both solution polymerization and subsequent bromination of the rubber is employed.

Process for producing brominated butyl rubber

The present invention relates to a reactor () and a process for continuous polymerization, where the reactor () has an essentially tubular reactor housing (). The reactor housing () has a drive () which runs along the geometric central axis () in the flow direction () and is configured as a central shaft. A rotatably arranged scraper or wiper () is provided within the reactor housing (); the scraper or wiper () has at least one scraper or wiper blade () to run along an interior side () of the reactor housing (). The rotational movement of the scraper or wiper () results in radial mixing of a stream within the reactor housing () which dominates gravity effects and, by virtue of shaping of the scrapers or wipers, optionally makes plug flow or a loop flow or backflow within the reactor () or else via an additional external pumped circulation system () possible. This allows the reaction conditions in the axial direction of the reactor housing () to be predicted and individually suitable reaction conditions to be set and controlled along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

Reactor and method for continuous polymerization

The present invention relates to a reactor () and a process for continuous polymerization, where the reactor () has an essentially tubular reactor housing (). The reactor housing () has a drive () which runs along the geometric central axis () in the flow direction () and is configured as a central shaft. A rotatably arranged scraper or wiper () is provided within the reactor housing (); the scraper or wiper () has at least one scraper or wiper blade () to run along an interior side () of the reactor housing (). The rotational movement of the scraper or wiper () results in radial mixing of a stream within the reactor housing () which dominates gravity effects and, by virtue of shaping of the scrapers or wipers, optionally makes plug flow or backflow within the reactor () possible. This allows the reaction conditions in the axial direction of the reactor housing () to be predicted and individually suitable reaction conditions to be set and controlled along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

The invention relates to a mixer reactor of the rotor-stator type. This mixer reactor comprises a substantially rotationally symmetric housing which has a distributing chamber, a mixing chamber, a front plate that modifies the cross-section of the housing between these two chambers, and there are separate inlets into the mixing chamber for at least two substances and an outlet for removing the mixed material or product. The inlet for the first substance is provided in the axis of rotation of the mixing chamber. Two or more channels are aligned radially outward from this inlet, and the first substance is transported through these channels and into the mixing chamber. The inlet for the at least second substance is constructed in the form of a plurality of openings in the front plate, these inlet openings being are arranged rotationally symmetrically to the axis of rotation. Each of these inlet openings for the at least second substance has a corresponding pin which can be displaced in the axial direction.

Process and mixing unit for the preparation of isocyanates by phosgenation of primary amines

Method for thawing frozen water-containing products by heating and stirring in a horizontal mixer.

Method for melting frozen, water-containing products in a mixer

The invention describes a stirring device made from a gassing stirrer and a liquid mixer or two liquid mixers, which are arranged on a shaft and each have a feed and at least one exit opening, wherein the exit openings of the gassing stirrer and of the liquid mixer or the liquid mixers are at a distance from one another, the ratio, a/d, of the distance, a, between the exit openings to the diameter, d, of the gassing stirrer or liquid mixer being 0.02 to 0.5 and the ratio, b/d, of the distance, b, between the outer edges to the diameter, d, of the gassing stirrer or liquid mixer being 0.01 to 0.4.

Stirring device and process for carrying out a gas-liquid reaction

Growing community of inventors

Leverkusen, Germany

Joachim Ritter