04266981 is referenced by 33 patents and cites 4 patents.

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.

Title
Process for recovering and utilizing cellulose using sulfuric acid
Application Number
884480
Publication Number
4266981
Application Date
October 3, 1979
Publication Date
May 12, 1981
Inventor
Terry Y Chou
West Lafayette
IN, US
George T Tsao
West Lafayette
IN, US
Agent
Robert E Harris
John R Nesbitt
Assignee
Purdue Research Corporation
IN, US
IPC
C13K 1/02
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