Process for preparing methionine

US10919848B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Sebastian Bernhardt · Munich, DE
• Martin Körfer · Goldbach, DE
• Stefan Reichert · Frankfurt, DE
• Hans Joachim Hasselbach · Gelnhausen, DE
• Bernd Drapal · Alzenau, DE
• Rainer Peter · Hösbach, DE
• Christian Kaiser · Waldaschaff, DE
• Benny HARTONO · Singapore, SG
• Harald Jakob · Hasselroth, DE

Key dates

• Filing date: May 8, 2018
• Grant date: Feb 16, 2021
• Expiry date: May 8, 2038

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C323/58
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A process for preparing methionine includes the alkaline hydrolysis of 5-(2-methylmercaptoethyl)-hydantoin (methionine hydantoin) in an aqueous process solution containing alkali metal hydroxide and/or alkali metal carbonate and/or alkali metal hydrogencarbonate. The alkali metal cations in the process solution are potassium and sodium having a K/Na molar ratio range from 99/1 to 20/80.