Process for the production of aqueous sodium methioninate solutions
AssigneeDegussa AG
InventorsManfred Spindler, Herbert Tanner, Friedhelm Geiger, Friedrich Bittner, Jurgen Martens
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Abstract
Aqueous sodium methioninate solutions having a low content of sodium carbonate can be recovered from the crude hydrolysis mixture resulting from the saponification of 5-(.beta.-methylmercaptoethyl)hydantoin with 1.1 to 6 equivalents of sodium hydroxide and/or sodium carbonate by cooling the crude hydrolysis mixture to a temperature below 10.degree. C., separating off the precipitated sodium carbonate and concentrating the sodium methioninate solution remaining to 40 to 65 weight percent.
Claims10
A process for the production of an aqueous sodium methioninate solution having a low content of sodium carbonate comprising forming a crude aqueous hydrolysis mixture by the saponification of 5-(.beta.-methylmercaptoethyl)-hydantoin with 1.1 to 6 equivalents of sodium hydroxide, sodium carbonate or a mixture of sodium hydroxide and sodium carbonate, cooling the crude hydrolysis mixture to a temperature below 10.degree. C., separating off the precipitated sodium carbonate and concentrating the sodium methioninate solution remaining to 40 to 65 weight percent.
Dependencies are inferred from the claim text.