Degussa Aktiengesellschaft

Rudi E Moerck

Axel Kleemann

Wolfgang Leuchtenberger

Michael Karrenbauer

Larry L Berger

George C Fahey, Jr

G Arnold

Kurt Klostermann

Neal R Merchen

Oswald Helmling

H Rzehak

John Medina

A method is disclosed for treating a lignocellulosic substrate in order to imrpove its nutritive value wherein a plant substrate is treated with a sufficient amount of an alkaline material and hydrogen peroxide, or a compound capable of generating hydrogen peroxide, for a sufficient period of time and the reaction mass is extruded to produce a product having increased nutrient availability.

Chemical-mechanical treatment of lignocellulosics to improve nutritive

L-amino acids present in cleavage solutions obtained in the acylase-catalyzed cleavage of N-acetyl-D,L-amino acids are isolated by use of a strongly acidic ion exchanger in H+ form. First, the mother liquor from a previous treatment cycle is fed to the ion exchanger, and then the cleavage solution and finally the wash water and the discharge from the ion exchanger which is pH-controlled is analyzed into an 'effluent water fraction', an 'N-acetyl-D-amino acid fraction' and an 'L-amino acid fraction'. The last fraction is adjusted by addition of fresh cleavage solution to a pH of between 4.0 and 6.0, and from the mixture which is thus obtained the L-amino acid is isolated by crystallization. The mother liquor which is obtained is recycled back into a subsequent treatment cycle.

Process for the isolation of L-amino acids

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Montville, NJ, United States of America

Rudi E Moerck