Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
2005-04-19
2005-04-19
Tsang, Cecilia J. (Department: 1625)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C562S554000
Reexamination Certificate
active
06881861
ABSTRACT:
Disclosed herein is a method of purifying L-glutamic acid by transformation recrystallization which method comprises maintaining crude crystals of L-glutamic acid containing α crystals of L-glutamic acid in an aqueous solvent at a temperature of from 50° C. to the boiling point of said aqueous solvent in the coexistence of active carbon until about 30% or more of the crystals of L-glutamic acid have been transformed into β crystals thereof, the amount of said aqueous solvent being an amount not more than the amount sufficient (i.e., an amount insufficient) to form a saturated solution of said crystals of L-glutamic acid, according to which method purified crystals of L-glutamic acid can be obtained extremely rapidly and in high yields, and remarkably conveniently and easily on an industrial scale, as compared with the conventional transformation recrystallization method which is a hitherto common purification method of L-glutamic acid.
REFERENCES:
patent: 3565950 (1971-02-01), Ito et al.
patent: 45-4730 (1970-02-01), None
patent: 46-10844 (1971-03-01), None
Int'l Search Report, Aug. 27, 2002, Japan Patent Office.
Int'l Preliminary Examination Report, Jun. 12, 2003, Japan Patent Office.
Koda Takayuki
Saitou Yoshiki
Sato Kazuhiro
Ueda Hiroshi
Ajinomoto Co. Inc.
Cermak Shelly Guest
Oh Taylor Victor
Tsang Cecilia J.
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