Process for recovering and utilizing cellulose using...

Details Process for recovering and utilizing cellulose using... Process for recovering and utilizing cellulose using...

C - Chemistry, Metallurgy

12

P

195/139

C12P 19/02 (2006.01) C12P 19/04 (2006.01) C13K 1/02 (2006.01) D21C 1/04 (2006.01) D21C 3/04 (2006.01)

Patent

CA 1119982

Abstract A process is disclosed for recovering cellulose using sulfuric acid and utilizing the recovered cellulose by hydrolyzing to yield glucose. Cellu- losic raw materials are hydrolyzed by dilute sulfuric acid to remove hemicellulose, after which the solid residue is separated and concentrated sulfuric aicd is added thereto to dissolve cellulose in the solid residue. After blending and mixing of the resi- due in the concentrated sulfuric acid under closely controlled reaction conditions, cellulose is repre- cipitated by addition of water or an organic solvent such as methanol. The recovered cellulose can then be hydrolyzed by cellulase enzymes and/or dilute acids to provide a high yield of glucose. High level re- covery and reconcentration of the sulfuric acid is also disclosed.

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