Covestro Deutschland Ag

Bayer Materialscience Ag

Bayer Aktiengesellschaft

Bayer Materialscience, LLC

Other

Bayer Intellectual Property Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Friedhelm Steffens

Wolfgang Lorenz

Rainer Bruns

Fritz Pohl

Berthold Keggenhoff

Tim Loddenkemper

Klaus Biskup

Jan Busch

Frank Richter

Bernd Pennemann

Andreas Hecking

Thomas Runowski

Reinhard Halpaap

Josef Sanders

Oswald Wilmes

Herbert Stutz

Alfred Soppe

Thomas Knauf

Volker Michele

Stefan Groth

Peter Lehner

Joachim Zechlin

Knud Werner

Bastian Mahr

Wolfgang Taube

Rainer Buse

Bill Brady

Gerhard Ruffert

Dietmar Wastian

Michael Merkel

Andreas Karl Rausch

Richard Adamson

Gerhard Wiechers

Joachim Ritter

Jürgen Münnig

Rainer Bellinghausen

Wilfried Hedderich

Hans-Walter Brandt

Kai Verkerk

Jeffrey Bolton

Matthias Böhm

Lars Padeken

Thorsten Leidig

Guenther Weymans

Bill L Brady, Jr

Juergen Bittner

Franz Beggel

Hartwig Kempkes

Christian Drumm

Jurgen Schroter

Jürgen Bausa

Andre Rittermeier

Marc Seekamp

Murat Kalem

Eric Jakobs

Ulrich Hollmann

Shabnam Majidi Salehi

Sebastian Pohl

Jonas Krause

Rainer Hellmich

Luyan Wu

Micky Qian

Jürgen Bittner

Henrike Fink

Anke Hielscher

Matthias Boehm

Wenbin Ji

Lothar Weismantel

Denise Chan

Jürgen Kern

Klaus Tidow

Markus Hollaus

Dieter Hoffmann

Ji Wenbin

Andreas Rausch

The invention relates to a method for recovering raw materials from polyurethane products, comprising the steps of (A) providing a polyurethane product that is based on an isocyanate component and a polyol component; (B) reacting the polyurethane product with a (mono- or polyvalent) alcohol in the presence of a catalyst, thereby obtaining a first product mixture; (C) obtaining the polyols from the first product mixture, comprising (C.I) mixing, without prior removal of any water that might be contained in the first product mixture, the first product mixture obtained in step (B) with an organic solvent that is not completely miscible with the alcohol used in step (B), and phase separation into a first alcohol phase and a first solvent phase; (C.II) processing the first solvent phase and obtaining polyols; and preferably (D) obtaining amines.

Method for recovering raw materials from polyurethane products

The present invention relates to a method and a system for separating and treating impurities from a hydrogen chloride liquid mixture from the process for preparing isocyanate with phosgenation including sending hydrogen chloride liquid mixture into a gas-liquid separation column for separation to yield a liquid phase flow with impurities at the bottom of the gas-liquid separation column, neutralizing the liquid phase flow comprising impurities with an alkaline liquid in the neutralization tank to yield a neutralized solution, and sending the neutralized solution into a waste liquid treatment device from said neutralization tank for treatment.

Method and a system for separating and treating impurities from a hydrogen chloride liquid mixture

The present invention relates to a distributor device () for the even distribution of a fluid () into 2 or more fluid streams each containing gas () and liquid (), with a falling film evaporator (), in which the distributor device according to the invention serves to distribute the 2 or more fluid streams onto the heating pipes of the evaporator, and to the use of the distributor device () according to the invention and in particular the falling film evaporator () according to the invention in the production and/or preparation of chemical products. The distributor device according to the invention is characterized, in particular, by a swirl breaker () for the gas phase () which arises from separating the fluid () into a gas phase () and a liquid phase () within the distributor device.

Distributor device, in particular for falling film evaporators, and use thereof

The present invention concerns a process for the preparation of pure aniline, comprising the steps of a) providing a crude aniline fraction containing up to 20.000% by weight of phenol; b) dividing the crude aniline fraction from step a) into a first partial stream and a second partial stream; c) distilling the first partial stream from step b) in a first distillation column and distilling the second partial stream from step b) in a second distillation column, wherein the first distillation column is operated at a higher head pressure than the second distillation column, with the proviso that each of the first distillation column and the second distillation column is operated at a head pressure in the range from 1.0 mbarto 500 mbar, and wherein from each of the first distillation column and the second distillation column, (i) a gaseous aniline distillate (=purified aniline) is removed as the overhead product and subsequently condensed, wherein a first partial stream of the condensed aniline distillate is returned to the first and/or the second distillation column as a reflux stream and a second partial stream of the condensed aniline distillate is removed as the product stream, and (ii) a liquid bottom stream which is concentrated in phenol is removed, from which a first portion is partially or completely vaporised and is returned to the respective distillation column, and from which a second portion is discharged; d) using the heat released during the condensation of the aniline distillate from the first distillation column in order to provide the heat necessary for vaporising the first portion of the bottom stream from the second distillation column.

Aniline purification process

The invention relates to a novel method for producing polyisocyanurates comprising isocyanate groups, based on 2,4- and 2,6-toluylene diisocyanate (TDI) and to the use thereof in coating compositions.

Method for producing TDI-trimerisates with high purity

A distillation column for separating a multicomponent mixture into at least three fractions. The distillation column has at least one separating wall and at least one material exchange element () above the at least one separating wall. A device () for mixing the steam flows flowing upwards to the left and the right of the at least one separating wall is arranged between the at least one separating wall and the at least one material exchange element (). The use of the distillation column for purifying isocyanates, in particular for toluene diisocyanate (TDI), is also described.

Distillation column and use thereof for cleaning isocyanates

The invention relates to the production of isocyanates by means of phosgenation of the corresponding primary amines in the gas phase, wherein the reactant flows of amine and phosgene are fed separately to a reactor through a pre-heated inert gas flow. Isocyanates within the sense of the invention are, in the broadest sense, all isocyanates whose corresponding amines can be substantially converted into the gas phase without decomposing, with the exception of 1,5-pentane diisocyanate.

Method for producing isocyanates

A method for producing isocyanates by reacting primary amines with phosgene in a stoichiometric excess in the gas phase, wherein the excess phosgene is subsequently recovered and recirculated back into the reaction. particular a method for the feedback-controlled recirculation of the recovered phosgene, particularly when the phosgene stream that should be recovered is distributed between multiple gas-phase reactors operated in parallel.

The invention relates to polyisocyanates comprising urethane groups, based on toluylene diisocyanate, to a method for their production, and to their use as the polyisocyanate component in one- and two-component polyurethane coatings.

Method for producing light-coloured TDI-polyisocyanates

One or more fluid streams are uniformly divided into two or more partial fluid streams in chemical apparatuses in a manner such that there is a reduced tendency to form deposits. Division of such stream(s) is achieved by using a distributor device that includes at least one plate having two or more openings which openings are rounded or chamfered on at least one side.

Method for dividing fluid streams

The present invention relates to a process for purifying raw-material gases by fractionation. In particular, the present invention relates to a process for cleansing chlorine gas of bromine.

Process for purifying raw-material gases by fractionation

The present invention relates to a process for separating an isocyanate prepared by reaction of a primary amine with an excess of phosgene in the gas phase from the gaseous crude product obtained in the reaction, wherein

Process for separating an isocyanate prepared by phosgenation of a primary amine in the gas phase from the gaseous crude product of the phosgenation

This invention relates to a process for operating a gas phase phosgenation plant () to form an isocyanate () by reacting an amine () with phosgene (), in which the gas phase phosgenation plant is shut down by first stopping the amine stream and still maintaining the phosgene stream. After a period of time which corresponds to at least 10 times the residence time of phosgene () in the main parts of the gas phase phosgenation plant () in regular operation, calculated from the time at which the amine inflow has been completely stopped, the feed of phosgene is also stopped. An inert gas stream () is maintained through the amine and phosgene feeding devices and through all the other essential parts of the gas phase phosgenation plant () during the shutdown.

Process for operating a gas phase phosgenation plant

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Leverkusen, Germany

Friedhelm Steffens