Covestro Deutschland Ag

Covestro Intellectual Property Gmbh & Co. Kg

Gernot Jaeger

Hartmut Nefzger

Franz Beggel

Stefan Wershofen

Jens Langanke

Amgad Salah Moussa

Wolf Kloeckner

Jorgen Magnus

Guenter Olf

Walter Leitner

Volker Michele

Christoph Guertler

Thomas Ernst Mueller

Markus Dugal

Swantje Behnken

Giulio Lolli

Gesa Behnken

Natalie Bittner

Lukas Reisky

Matthias Leven

Anton Vidal Ferran

Jose Luis Nuñez Rico

Jung-Won Youn

Mohammad Yalfani

Georg Sprenger

Daniela Cozzula

Simon Klaff

Andreas Ernst

Thomas Voessing

Günter Olf

A process is provided, by means of which polyurethanes, which have been formed from polyether polyols and aromatic isocyanates, can be decomposed to polyether polyols and aromatic amines.

Process for the decomposition of polyether-polyurethane

The invention relates to a method for producing aniline or an aniline derivative, in which a solution of aminobenzoic acid in aniline with a mass fraction of aniline in the solution, in relation to the total mass of aminobenzoic acid and aniline, in the region of 20% to 85%, is subject to a thermal decarboxylation at a temperature in the region of 165&#xb0; C. to 500&#xb0; C. without the presence of a non-system catalyst, such that the aminobenzoic acid is converted into aniline. The obtained aniline can be converted into derivatives, such as di- and polyamines of the diphenylmethane series.

Method for producing aniline or an aniline derivative

The invention relates to a method for producing aminobenzoic acid or an aminobenzoic acid derivative using a fermentation process, in which (I) the aminobenzoic acid formed in the fermentation broth obtained by the fermentation is bound in part, or as much as possible based on the solubility equilibrium, as insoluble calcium-aminobenzoate, said insoluble calcium-aminobenzoate is then (II) either isolated as such or in a mixture with the microorganism used in the fermentation and transitioned into a water soluble form, while separating an insoluble calcium salt which is different from the calcium-aminobenzoate, and then (III) by introducing carbon dioxide under pressure into the aqueous solution from the precipitated calcium salt has been released, aminobenzoic acid is precipitated.

Method for producing aminobenzoic acid or an aminobenzoic acid derivative product

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 provides a recombinant microbial host cell capable of converting a raw material comprising a fermentable carbon substrate to o-aminobenzoate biologically. The invention further provides a method for producing aniline, comprising the steps of: a) producing o-aminobenzoate by fermentation of a raw material comprising at least one fermentable carbon substrate using the recombinant microbial host cell of the capable of converting said raw material comprising at least one fermentable carbon substrate to o-aminobenzoate biologically, wherein said o-aminobenzoate comprises anthranilate anion, b) converting said o-aminobenzoate from said anthranilate anion to anthranilic acid by acid protonation, c) recovering said anthranilic acid by precipitation or by dissolving in an organic solvent, and d) converting said anthranilic acid to aniline by thermal decarboxylation in an organic solvent.

Recombinant strain producing O-aminobenzoate and fermentative production of aniline from renewable resources via 2-aminobenzoic acid

The invention relates to a method for producing aniline, comprising the steps of: a) providing o-aminobenzoate, wherein said o-aminobenzoate comprises anthranilate anion and a suitable cation, b) converting said anthranilate anion to aniline by thermal decarboxylation in the presence or absence of a catalyst, c) extracting the aniline produced in step b) in an organic solvent at least once, and d) purifying the aniline produced in steps b) and c) by distillation, wherein said distillation produces aniline and a water phase.

Production of aniline via anthranilate

Growing community of inventors

Cologne, Germany

Gernot Jaeger