Recovery of l-phenylalanine and l-aspartic acid during...

Details Recovery of l-phenylalanine and l-aspartic acid during... Recovery of l-phenylalanine and l-aspartic acid during...

C - Chemistry, Metallurgy

07

K

260/533.2, 260/5

C07K 5/075 (2006.01)

Patent

CA 1184935

ABSTRACT OF THE DISCLOSURE There is described an improved process for the separation and recovery of L-phenylalanine and L-aspartic acid from sidestreams resulting from the preparation of .alpha.-L-aspartyl-L-phenylalanine methyl ester. It has been found that superior separation is obtained by combining one or more of the mother liquor and wash solutions formed during the preparation of .alpha.-L-aspartyl-L-phenylalanine methyl ester, hydrolyzing same to afford the hydrohalide salts of L-aspartic acid and L-phenylalanine, acidifying the hydrolysis solution to precipitate the hydrohalide salt of L-phenylalanine, separating the hydrohalide salt of L-phenylalanine, dissolving it in water and adjusting the pH of the solu- tion to the isoelectric point of L-phenylalanine, thus affording pure L-phenylalanine, and thereafter adjusting the pH of the solution after separation of the L-phenyl- alanine hydrohalide to the isoelectric point of L-aspartic acid to precipitate L-aspartic acid.

393089

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