(19)
(11) EP 3 431 465 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
10.04.2019 Bulletin 2019/15

(43) Date of publication:
23.01.2019 Bulletin 2019/04

(21) Application number: 17182515.1

(22) Date of filing: 21.07.2017
(51) International Patent Classification (IPC): 
C07C 319/20(2006.01)
C07C 323/58(2006.01)
 C07C 319/28(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(71) Applicant: Evonik Degussa GmbH
45128 Essen (DE)

(72) Inventors:
  • BERNHARDT, Sebastian
    63739 Aschaffenburg (DE)
  • KÖRFER, Martin
    63796 Kahl (DE)
  • REICHERT, Stefan
    60438 Frankfurt (DE)
  • HASSELBACH, Hans Joachim
    63571 Geinhausen (DE)
  • DRAPAL, Bernd
    63755 Alzenau (DE)
  • PETER, Rainer
    63829 Krombach (DE)
  • KAISER, Christian
    63857 Waldaschaff (DE)
  • HARTONO, Benny
    119916 Singapur (SG)
  • JAKOB, Harald
    63594 Hasselroth (DE)

   


(54) PROCESS FOR PREPARING METHIONINE


(57) The present invention relates to a process for preparing methionine, comprising the alkaline hydrolysis of 5-(2-methylmercaptoethyl)-hydantoin (methionine hydantoin) in an aqueous process solution comprising alkali metal hydroxide and/or alkali metal carbonate and/or alkali metal hydrogencarbonate wherein 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 and to an aqueous fertilizer resulting from this process.