Covestro Deutschland Ag

Bayer Materialscience Ag

Bayer Aktiengesellschaft

Bayer Intellectual Property Gmbh

Covestro Intellectual Property Gmbh & Co. Kg

Covestro LLC

Bayer Materialscience, LLC

Covestro Duetschland Ag

Stefan Wershofen

Manfred Schmidt

Christoph Gürtler

Thomas Knauf

Klaus-Gerd Gruner

Volker Hartjes

Stephan Klein

Richard Adamson

Wolfgang Lorenz

Torsten Hagen

Rainer Bruns

Tim Loddenkemper

Hans-Georg Pirkl

Andreas Karl Rausch

Daniel Koch

Markus Dugal

Walter Leitner

Jörg Sundermeyer

Hongchao Li

Stefan Grabowski

Jens Krause

Volker Michele

Peter Lehner

Christoph Guertler

Fritz Pohl

Thomas Ernst Mueller

Peter Plathen

Gernot Jaeger

Dirk Manzel

Christian Steffens

Knut Sommer

Rudolf Uchdorf

Heinz-Herbert Müller

Stefan Penninger

Andreas Hoffmann

Hans-Detlef Arntz

Thomas Schieb

Stephan Schubert

Jens Langanke

Wolfgang Friederichs

James-Michael Barnes

Javier Perez-Ramirez

Jeffrey Bolton

Henning Vogt

Gunter Hammen

Gernot Jäger

Franz-Ulrich Von Gehlen

Peter Drinda

Jürgen Arras

Jürgen Spriewald

Anke Hielscher

Marcus Steinwegs

Andreas Jacob

Karsten Becker

Xinkui Wang

Maoqing Kang

Liguo Wang

Yubo Ma

Xiaoguang Guo

Youquan Deng

Zhiping Zhou

Anton Vidal-Ferran

Fuming Mei

Jochen Mahrenholtz

Ernst Felske

Franz Beggel

Werner Bäcker

Andre Lago

Ido Schwarz

Tetsuo Harada

Benie Marotz

Javier Pérez-Ramirez

Marc Seekamp

Jun Wang

Sabine Pegel

Matthias Leven

Friedhelm K&auml;mper

Thorsten Dreier

Georg Pirkl

Axel Scherer-Werke

Jörg Laue

Werner Kilian

Matthias Ruhland

Felix Gärtner

Elisenda Reixach

Begona Puertolas Lacambra

Francese Xavier Rius-Ruiz

Franz-Ulrich Gehlen

Qifeng Li

Tobias Caesar Keller

Junwei Wang

Shiguo Zhang

Yude He

Daniela Cozzula

José Luis Núñez Rico

Amol P Amrute

Nobuhiro Kamiyama

Shinichi Murakami

Andreas Ernst

The present invention relates to a process for preparing di- and polyamines of the diphenyl methane series. More specifically, the process comprises reacting aniline and formaldehyde by (1a) mixing aniline with hydrochloric acid to form aniline hydrochloride, and (1b) mixing the aniline hydrochloride with a first portion of aqueous formaldehyde; or (1c) mixing aniline with a first portion of aqueous formaldehyde to form an aminal, and (1d) mixing the aminal with hydrochloric acid; to obtain a first reaction product; (2) converting the first reaction product to a second reaction product comprising di- and polyamines of the diphenyl methane series in a cascade of 4 to 25 reaction zones arranged in series, wherein a second portion of aqueous formaldehyde is added to the second of the reaction zones, in which second reaction zone the temperature is equal to or up to 20&#xb0; C. higher than the temperature in the first reaction zone, and wherein the temperature consecutively increases from the third to the last of the reaction zones, the temperature in the third of the reaction zones being from 15&#xb0; C. to 50&#xb0; C. higher than in the second of the reaction zones, and (3) working-up the second reaction product to obtain the di- and polyamines of the diphenyl methane series.

Process for preparing di- and polyamines of the diphenyl methane series

The present invention relates to a catalyst for preparing carbamates, in particular aromatic carbamates, comprising a binary oxide having the formula LMO, wherein L is a metal selected from the lanthanoid series and M is a metal selected from the group consisting of Sc, Y, Ti, Zr, Hf, metals from the lanthanoid series and metals from the actinoid series, and wherein x ranges from 0.01 to 0.05. The present invention also relates to a method for producing said catalysts and a method of utilizing said catalysts in the production of carbamates, in particular aromatic carbamates.

Heterogeneous catalysts for the synthesis of carbamates

The invention relates to a method for producing methylene-diphenylene-diisocyanate and optionally a mixture of methylene-diphenylene-diisocyanate and polymethylene-polyphenylene-polyisocyanate, wherein, in a step &#x3b1;), a fraction () containing a methylene-diphenylene-diisocyanate and secondary components is provided, optionally via a step &#x3b1;.), the separating of methylene-diphenylene-diisocyanate and secondary components from a fraction () containing methylene-diphenylene-diisocyanate and polymethylene-polyphenylene-polyisocyanate, and wherein, in a step &#x3b2;), the fraction () containing methylene-diphenylene-diisocyanate and secondary components is subjected to a purification comprising an isomer separation by distillation and/or crystallization in two or more sub-steps (a, b, . . . ), obtaining two or more methylene-diphenylene-diisocyanate-reinfractions (--, . . . ) and a secondary component fraction (), wherein the secondary component fraction () obtained in step &#x3b2;) is returned to one of the sub-steps of step &#x3b2;), wherein none of the methylene-diphenylene-diisocyanate-reinfractions (--, . . . ) from step &#x3b2;) are obtained as distillation or crystallization, and/or to step &#x3b1;.), insofar as carried out.

Method for producing methylene-diphenylene-diisocyanates and polymethylene-polyphenylene-polyisocyanates

The invention relates to a method for producing an isocyanate, wherein a carbamate or thiolcarbomate is converted, in the presence of a catalyst, with separation of an alcohol or thioalcohol, at a temperature of at least 150&#xb0; C., to the corresponding isocyanate, wherein a compound of the general formula (X)(Y)(Z&#x2014;H) is used as a catalyst, in particular characterized in that the compound has both a proton donor function and a proton acceptor function. In the catalysts according to the invention, a separable proton is bound to a heteroatom, which is more electronegative than carbon. Said heteroatom is either identical to Z or a component thereof. In the catalysts according to the invention, there is additionally a proton acceptor function which is either identical to X or a component thereof. According to the invention, the proton donator and proton acceptor function are connected to each other by the bridge Y.

Method for producing isocyanates

The present invention relates to silica-based heterogeneous zinc compounds which are suitable as catalysts in the reaction of amines with dialkyl carbonates to produce carbamates. The catalysts have the formula [SiO]&#x2014;CH&#x2014;CHR&#x2014;X&#x2014;COOZn[Y], wherein [SiO] represents a silica carrier selected from the group consisting of ordered mesoporous silica and irregular amorphous narrow pore silica, R represents a moiety selected from the group consisting of hydrogen, &#x2014;CH, and &#x2014;CHCH, preferably hydrogen, X is an aliphatic chain of 2 to 11 carbon atoms that optionally comprises ether moieties and [Y] represents a mono anion. The invention is also directed towards a method for the preparation of the aforementioned compounds and towards method for the alkoxycarbonylation of amines.

Silica-based zinc catalysts, their preparation and use in the alkoxycarbonylation of amines

The invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series (MDA), in which firstly crude MDA is prepared and is then subjected to a distillation process, wherein the distillation process comprises the following:

Process for the preparation of di- and polyamines of the diphenylmethane series

The invention relates to a method for the preparation of di- and polyamines of the diphenylmethane series, care being taken during the shutdown of the production process that an excess of aniline and respect to formalin is ensured.

Process for preparation of di- and polyamines of the diphenylmethane series

The present invention relates to a process for preparing di- and polyamines of the diphenylmethane series (MDA), a system for producing MDA and a process for operating a system for preparing MDA. The invention enables optimization of production standstills during operation of the MDA process with respect to time expenditure and optionally also with respect to energy and material consumption by means of a so-called recirculation mode for individual system components. During interruption of the process or interruption of the operation of individual system components, formaldehyde is not introduced into the reaction and the system components that are not affected by a revision, repair, or cleaning measure are operated in so-called recirculation mode. This enables, among other things, that only the affected system component can be put in standstill during the time period of the measure, which is advantageous in terms of productivity and economy of the process as well as in terms of the quality of the products produced.

The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, by condensing aniline and formaldehyde followed by an acid-catalysed rearrangement at different production capacities with alteration of the isomer composition in the resulting diamines of the diphenylmethane series (altering the 2,4'-MDA content). Adapting the molar ratios of the total used aniline to the total used formaldehyde and of the total used acid catalyst to the total used aniline, and adapting the reaction temperature, allows the rearrangement reaction to be fully completed despite the change in dwell time inevitably associated with a change in production capacity, and allows the formation of undesired by-products to be avoided as far as possible; the intended modification to binuclear content is likewise achieved.

Method of producing diamines and polyamines of the diphenylmethane series

The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, by condensing aniline and formaldehyde followed by an acid-catalysed rearrangement at different production capacities with alteration of the content of diamines of the diphenylmethane series (altering the binuclear content). Adapting the molar ratio of the total used aniline to the total used formaldehyde and adapting the reaction temperature allows the rearrangement reaction to be fully completed despite the change in dwell time inevitably associated with a change in production capacity, and allows the formation of undesired by-products to be avoided as far as possible; the intended modification to binuclear content is likewise achieved.

A method for producing a composition comprising polycarbodiimide, comprising the step of the reaction of a reaction mixture which contains an aromatic polyisocyanate and a carbodiimidising catalyst, wherein, before the reaction, the aromatic polyisocyanate is treated at a temperature of &#x2265;80&#xb0; C. to &#x2264;150&#xb0; C. and a pressure of &#x2265;1 mbar to &#x2264;500 mbar by passing through an inert gas and/or during the reaction, the reaction mixture is treated at a temperature of &#x2265;80&#xb0; C. to &#x2264;150&#xb0; C. and a pressure of &#x2265;1 mbar to &#x2264;500 mbar by passing through an inert gas and wherein the content of hydrolysable chlorine in the reaction mixture is &#x2264;10 ppm.

Method for producing a composition comprising polycarbodiimide having improved storage stability

The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, by condensing aniline and formaldehyde followed by an acid-catalysed rearrangement at different production capacities. Adapting the respective molar ratios of the total used aniline to the total used formaldehyde and of the total used acid catalyst to the total used aniline allows the rearrangement reaction to be fully completed despite the change in dwell time inevitably associated with a change in production capacity and ensures that no undesired fundamental changes occur in the product composition.

Method of producing diamines and polyamines of the diphenylmethane series at different production capacities

The invention relates to a method for producing diamines and polyamines of the diphenylmethane series, by condensing aniline and formaldehyde followed by an acid-catalysed rearrangement at different production capacities. By adapting the temperatures in the acid-catalysed rearrangement step, the rearrangement reaction can be fully completed despite the change in dwell time inevitably associated with changed production capacity, with no undesired changes occurring in the product composition.

This invention relates to methods for producing chemical products, wherein the one or more feed materials are reacted to form a chemical product or a chemical composition. The invention further relates to plants for performing such methods, said plants being designed in such a way that, during an interruption of the methods, no input of at least one feed material into the reaction occurs and the plant parts not affected by a revision measure, maintenance measure, repair measure, or cleaning measure are operated in so-called re-circulation mode. It is thereby achieved, among other things, that only the affected plant part needs to be shut down for the time of the measure, which can be advantageous with regard to the productivity and economy of the method and the quality of the produced products. Finally, the invention relates to methods for operating plants in the event that individual plant parts are taken out of service.

Methods for producing chemical products with operation interruptions

The invention relates to a continuously operated method for producing isocyanates by reacting the corresponding amines with phosgene. When changing the target production capacity starting from a starting state with a specified production capacity and ending with an end state with a different production capacity, the current excess phosgene at the time of the transition period between the starting state and the end state, the change of the amine mass flow beginning during said time, is at least equal to and preferably greater than the excess phosgene during the production period when the production capacity is in the starting state prior to the beginning of the transition period; and the average excess phosgene during the transition period is greater than the excess phosgene during the production period when the production capacity is in the starting state prior to the beginning of the transition period.

Growing community of inventors

Mönchengladbach, Germany

Stefan Wershofen