Process for the recovery of methionine and potassium bicarbonate
AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsTheodor Lussling, Klaus-Peter Muller, Gerd Schreyer, Ferdinand Theissen
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Abstract
Methionine and potassium are recovered from the recycling solution of the potassium carbonate-methionine process by concentrating the mother liquor after the methionine precipitation and with cooling carbonating the mother liquor.
Claims13
In a process for the recovery of methionine and potassium bicarbonate from the solution recycling in the process of forming methionine by hydrolyzing 5-[2-methyl-mercaptoethyl]-hydantoin with aqueous potassium carbonate to form a mother liquor and precipitating methionine formed with carbon dioxide, the improvement comprising concentrating the aqueous mother liquor after separtion of the precipitated methionine to a titratable potassium ion concentration of 120 grams per liter to 210 grams per liter, and then carbonating the concentrated mother liquor with carbon dioxide and lowering the temperature by cooling from a temperature of not over 120.degree. C. during the carbonation to form an easily filterable crystallizate.
Dependencies are inferred from the claim text.