Process for the preparation of an aqueous solution of the sodium salt of methionine

  • US 4,789,686 A
  • Filed: 07/14/1987
  • Issued: 12/06/1988
  • Est. Priority Date: 07/17/1986
  • Status: Expired due to Fees
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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