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Title:
L-ORNITHINE CRYSTAL AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2006/051940
Kind Code:
A1
Abstract:
A process for producing L-ornithine crystals which comprises: (i) a step in which L-ornithine, a salt thereof, or a composition or solution containing either of these is treated with a cation-exchange resin to adsorb the L-ornithine onto the cation-exchange resin; (ii) a step in which the L-ornithine is eluted with an aqueous alkali solution from the cation-exchange resin onto which the L-ornithine has been adsorbed and the alkali ingredient is removed from the resultant eluate to obtain an aqueous L-ornithine solution; and (iii) a step in which the aqueous L-ornithine solution is mixed with a hydrophilic organic solvent and the L-ornithine is crystallized from the resultant solution.

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Inventors:
MURATA HIDEKI
NAKATANI IKUHIRO
SHITASHIGE MARIKO
TAJIMA KENJI
Application Number:
PCT/JP2005/020812
Publication Date:
May 18, 2006
Filing Date:
November 14, 2005
Export Citation:
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Assignee:
KYOWA HAKKO KOGYO KK (JP)
MURATA HIDEKI
NAKATANI IKUHIRO
SHITASHIGE MARIKO
TAJIMA KENJI
International Classes:
C07C227/42; C07C229/26
Foreign References:
JPH08157433A1996-06-18
JPS50135281A1975-10-27
JPS6124548A1986-02-03
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