Evonik Operations Gmbh

Achim Fischer

Cornelia Borgmann

Axel Ronneburg

Christian Renner

Lucas Geist

Anja Nordschild

Christian Reus

Harald Jakob

Jürgen Bilz

Nadine Duerr

Ludger Lautenschütz

Juergen Bilz

Ludger Lautenschuetz

Manuel Weber-stockbauer

Oliver Yair Gutierrez-tinoco

Axel Mescher

Ricardo Bermejo Deval

A catalyst may include a support and from 5 to 20 wt.-% of a promoter, based on the total weight of the catalyst, wherein the support may include titanium dioxide, zirconium dioxide, and/or a mixture thereof, and the promoter may be an alkali metal oxide. Processes for preparing such catalysts may include impregnating a support of titanium dioxide and/or zirconium dioxide with an aqueous solution including a preferably soluble alkali compound and calcining. Alkyl mercaptans may be prepared in the presence of such catalysts or catalysts obtained by such processes.

Catalyst for the synthesis of alkyl mercaptan and process for its preparation

The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeO2 comprising particles, wherein the CeO2 comprising particles have a BET surface area of from 175 to 300+/−10% m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter x, mean of from 3+/−10% to 40+/−10% nm and a mean minimum Feret diameter x, mean of from 2+/−10% to 30+/−10% nm, both measured according to DIN ISO 9276-6 (2012).

Process for the preparation of methionine

The present invention relates to a process for the preparation of methionine comprising the step of contacting a solution or suspension comprising 2-amino-4-(methylthio)butanenitrile and/or 2-amino-4-(methylthio)butaneamide with water in the presence of a catalyst to give a methionine comprising mixture, wherein the catalyst comprises CeOcomprising particles, wherein the CeOcomprising particles comprise from 50 to 100 wt.-% of CeO, have a BET surface area of from 35 to 65 m/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xof from 10 to 40 nm and a mean minimum Feret diameter xof from 5 to 30 nm, both measured according to DIN ISO 9276-6 (2012).

The present invention relates to a process for producing mixed oxide catalysts on the basis of molybdenum and bismuth oxides in which the precursor compounds of the components of mixed oxide catalysts provided in the form of a solution and/or suspension are subjected to a spray-drying with a specific temperature regime and the spray particles obtained in this way are then calcined to yield a catalytic active mass, and to the mixed oxide catalysts obtainable by this process and to the use of these catalysts in the partial oxidation of olefins, in particular in the partial gas phase oxidation of propene to acrolein and acrylic acid. The spray drying of the precursor compounds containing solution or suspension is performed in concurrent with a gas stream having a specific entrance temperature. Alternatively, when the main gas stream has a higher entrance temperature, an additional colder gas stream can be fed in downstream. The thus obtained mixed oxide catalysts give lower a maximum temperature in the hot spot of catalyst fixed bed when they are used in the partial gas phase oxidation of olefins.

Method for preparing mixed metal oxide catalysts containing molybdenum and bismuth

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Goldbach, Germany

Achim Fischer