Process for the preparation of methionine

US11613521B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Juergen BILZ · Neuses, DE
• Cornelia Borgmann · Frankfurt, DE
• Achim Fischer · Gelnhausen, DE
• Lucas Geist · Neuses, DE
• Anja Nordschild · Oberursel, DE
• Christian Renner · Grundau, DE
• Christian Reus · Neuses, DE
• Axel Ronneburg · Hanau, DE

Key dates

• Filing date: Feb 3, 2020
• Grant date: Mar 28, 2023
• Expiry date: May 6, 2040

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C319/20
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

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 comprise from 50 to 100 wt.-% of CeO2, have a BET surface area of from 35 to 65 m2/g measured according to DIN ISO 9277-5 (2003), a mean maximum Feret diameter xFmax, mean of from 10 to 40 nm and a mean minimum Feret diameter xFmin, mean of from 5 to 30 nm, both measured according to DIN ISO 9276-6 (2012).