Evonik Operations Gmbh

Christian Reus

Cornelia Borgmann

Lucas Geist

Axel Ronneburg

Jürgen Bilz

Christian Renner

Achim Fischer

Anja Nordschild

Harald Jakob

Martin Körfer

Juergen Bilz

Daniel Rost

The invention refers to the use of a particulate catalyst containing 60.0 to 99.5 wt. % ZrOstabilised with an oxide of the element Hf and at least one oxide of the element M, wherein M=Ce, Si, Ti, or Y, for the hydrolysis reaction of methionine amide to methionine, wherein the median particle size xof the particulate catalyst is in the range of from 0.8 to 9.0 mm, preferably of from 1.0 to 7.0 mm. The invention also refers to a process for preparing methionine comprising a step of contacting a solution or suspension comprising methionine amide and water with said particulate catalyst to provide a reaction mixture comprising methionine and/or its ammonium salt from which methionine can be isolated.

Salt-free production of methionine from methionine nitrile

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).

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Freigericht, Germany

Christian Reus