Process for recovering and utilizing cellulose using sulfuric ac

Details Process for recovering and utilizing cellulose using sulfuric ac Process for recovering and utilizing cellulose using sulfuric ac

1979-10-03

1981-05-12

Marantz, Sidney

Sugar, starch, and carbohydrates

Processes

Carbohydrate manufacture and refining

162 76, 162 82, 435 99, C13K 102

Patent

active

042669812

ABSTRACT:
A process for recovering cellulose using sulfuric acid and utilizing the recovered cellulose by hydrolysis to yield glucose. Cellulosic raw materials are hydrolyzed by dilute sulfuric acid to remove hemicellulose, after which the solid residue is separated and is treated with concentrated sulfuric acid to dissolve cellulose contained therein. After blending and mixing of the residue in the concentrated sulfuric acid under mild reaction conditions, cellulose is reprecipitated by addition of water or an organic solvent such as methanol. The recovered cellulose can then be hydrolyzed by cellulose enzymes and/or dilute acids to provide a high yield of glucose. High level recovery and reconcentration of the sulfuric acid is also disclosed.

REFERENCES:
patent: 2302022 (1942-11-01), Giordani
patent: 2465347 (1949-03-01), Boehm
patent: 3212933 (1965-10-01), Hess
patent: 3972775 (1976-08-01), Wilke

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