C - Chemistry – Metallurgy – 07 – K
Patent
C - Chemistry, Metallurgy
07
K
C07K 5/075 (2006.01) C07C 227/40 (2006.01) C07C 227/42 (2006.01) C07C 229/24 (2006.01) C07C 229/36 (2006.01) C07K 1/14 (2006.01) C07K 5/072 (2006.01)
Patent
CA 2075307
The recovery of .alpha.-L-aspartyl-L-phenylalanine methyl ester, L-phenylalanine and L-aspartic acid from a mother liquor obtained by solid-liquid separation of a suspension of .alpha.-L-aspartyl-L-phenylalanine methyl ester crystals, is carried out by concentrating part or all of the mother liquor without desalting to provide a non-desalted concentrate; either adding a mineral acid and methanol to a part of the non-desalted concentrate or mixing a part of the non-desalted concentrate with a solvent comprising a mineral acid, methanol, water and, optionally, .alpha.-L-aspartyl-L-phenylalanine methyl ester, to precipitate an acid addition salt of .alpha.-L-aspartyl-L- phenylalanine methyl ester; recovering .alpha.-L-aspartyl-L- phenylalanine methyl ester as its acid salt; neutralizing the acid salt and recovering .alpha.-L-aspartyl-L-phenylalanine methyl ester; hydrolyzing the remaining concentrate with a mineral acid: and recovering L-phenylalanine or L-phenylalanine and L-aspartic acid.
Abe Sou
Kato Toshihisa
Kishimoto Shinichi
Kumon Satoshi
Takemoto Tadashi
Ajinomoto Co. Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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