Process for the preparation of an aqueous solution of the sodium salt of methionine
First Claim
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1. A process for the preparation of a concentrated aqueous solution of the sodium salt of methionine, practically free from inorganic salts, from an aqueous solution containing the sodium salt of methionine and a substantially equivalent quantity of sodium carbonate obtained by hydrolysis of 5-(β
- -methylmercaptoethyl)hydantoin with sodium hydroxide, which comprises adding to the said solution a quantity of sulphuric acid sufficient to neutralize all the sodium carbonate and, optionally, the sodium methioninate, recovering the carbon dioxide formed, concentrating the reaction medium after adding, if required, a quantity of sodium hydroxide to salify the methionine 46 to 52%, so as to provide a sufficient concentration of the sodium salt of methionine, separating the sodium sulphate precipitated by filtration, and isolating a filtrate containing the sodium salt of methionine practically free from inorganic salts which can be used directly in animal feeding-stuffs.
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Abstract
A concentrated aqueous solution of the sodium salt of methionine, which is practically free from inorganic salts, is produced from the medium resulting from the hydrolysis of 5-(β-mercaptoethyl)hydantoin.
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3 Claims
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1. A process for the preparation of a concentrated aqueous solution of the sodium salt of methionine, practically free from inorganic salts, from an aqueous solution containing the sodium salt of methionine and a substantially equivalent quantity of sodium carbonate obtained by hydrolysis of 5-(β
- -methylmercaptoethyl)hydantoin with sodium hydroxide, which comprises adding to the said solution a quantity of sulphuric acid sufficient to neutralize all the sodium carbonate and, optionally, the sodium methioninate, recovering the carbon dioxide formed, concentrating the reaction medium after adding, if required, a quantity of sodium hydroxide to salify the methionine 46 to 52%, so as to provide a sufficient concentration of the sodium salt of methionine, separating the sodium sulphate precipitated by filtration, and isolating a filtrate containing the sodium salt of methionine practically free from inorganic salts which can be used directly in animal feeding-stuffs.
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Current AssigneeAEC Societe de Chimie Organique et Biologique
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Original AssigneeAEC Societe de Chimie Organique et Biologique
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InventorsGiraud, Jean
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Primary Examiner(s)Foelak, Morton
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Assistant Examiner(s)Acquah, S. A.
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Application NumberUS07/073,159Time in Patent Office511 DaysField of Search514/183, 514/359, 514/389, 514/390, 514/476, 514/579, 514/584, 514/706, 514/562, 514/553, 514/554, 562/559, 562/554, 562/575US Class Current514/562CPC Class CodesC07C 319/20 by reactions not involving ...C07C 319/28 Separation; PurificationC07C 323/58 with amino groups bound to ...
