| 摘要 |
Substantially pure racemic monosidium glutamate is recovered from an aqueous solution containing it and Na2SO4 by preparing a substantially saturated solution at elevated temperature containing the two components, adding NaCl to precipitate Na2SO4, filtering off the latter, cooling the filtrate to precipitate racemic monosodium glutamate, and recovering the latter. In modifications: (i) the NaCl is added to an initially unsaturated aqueous solution of sodium glutamate and Na2SO4, and the solution is then concentrated to cause precipitation of Na2SO4; and (ii) a substantially saturated solution containing sodium glutamate, Na2SO4 and NaCl is prepared at an elevated temperature and cooled to precipitate racemic monosodium glutamate.
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