C - Chemistry – Metallurgy – 07 – G
Patent
C - Chemistry, Metallurgy
07
G
260/133, 260/224
C07G 1/00 (2006.01) C08B 37/14 (2006.01) D21C 1/02 (2006.01) D21C 3/20 (2006.01) D21C 11/00 (2006.01)
Patent
CA 1322366
ABSTRACT This invention relates to a novel method of continuously leaching ligin or hemicellulose and lignin from steam pretreated lignocellulosic material as the starting substrate. In the continuous leach of lignin, the starting substrate has first had the hemicellulose removed therefrom and is then mixed with a concentrated alkali solution, such as sodium hydroxide, to adjust its pH within a range from 10.0 to 13Ø The pH adjusted substrate is then continuously leached of its lignin by an alkali solvent, such as sodium hydroxide, moving in counter-flow so that the lignin extract and the now hemicellulose and lignin depleted material can be separately recovered. The preconditioning of the substrate undergoing lignin leaching avoids the precipitation of lignin out of the lignin extract at its forward counter-flow interface with the substrate. The continuous extraction of hemicellulose advantageously takes place upstream of the lignin leaching operation and again involves the movement of hemicellulose leaching solvent, such as water, moving in counter-flow direction to that of the starting substrate. Using a counter-current screw extractor in each leaching operation, high concentrations of hemicellulose and lignin in the extracts can be obtained and are superior in yield when compared to single batch leaching techniques.
614464
Forintek Canada Corp.
Nguyen Quang A.
Perley-Robertson Hill & Mcdougall Llp
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