PROCEDIMENTO PER LA PRODUZIONE DISOLUZIONI ACQUOSE DI METIONINATO SODICO A BASSO CONTENUTO DI CARBONATO SODICO

摘要

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 DEG C., separating off the precipitated sodium carbonate and concentrating the sodium methioninate solution remaining to 40 to 65 weight percent.