Sugar – starch – and carbohydrates – Processes – Carbohydrate manufacture and refining
Patent
1982-02-09
1984-09-11
Smith, William
Sugar, starch, and carbohydrates
Processes
Carbohydrate manufacture and refining
162 14, 162 16, 162 76, 162 77, 162 72, D21C 320, C13K 102, C07G 100
Patent
active
044708513
ABSTRACT:
Comminuted cellulosic materials which may or may not contain lignin are partially or totally hydrolyzed or saccharified by an improved organosolv process using an aqueous acetone solvent mixture containing a small amount of an acidic compound and containing at least about 70 percent by volume of acetone and up to virtually anhydrous acetone. The process is performed at elevated reaction temperatures, preferably at 145.degree. C. to 230.degree. C., for a limited period of time and then with cooling such that the resultant dissolved sugars from the hydrolysis are not degraded into non-sugars. In particular the reaction is conducted such that the cellulosic material is dissolved and such that at least ninety percent or more of available sugars in the cellulosic material are recovered. Unexpectedly it has been found that acetone at high concentration forms stable complexes with the sugars which prevents their degradation and also facilitates separation of the sugars. Lignin and sugars derived are commercially useful chemical compounds.
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Chang et al., "Comparative Dissolution Rates of Carbohydrates & Lignin During Acidified Aqueous Organusolv Saccharification of Alcohol-Benzene Extracted Douglas Fir & Aspen Woods" presented at Tappi Forest Biology/Wood Chem. Symp., Jun 20-22, (1977), Madison Wis.
Chang et al., "Recovery and GC Analysis of Wood Sugars from Organosolv Saccharification of Douglas-Fir-Heartwood" presented at 1976 Canadian Wood Chemistry Symposium, Mont Gabriel P. Q., Sep. 1-3, 1976.
Chang Pei-Ching
Paszner Laszlo
McLeod Ian C.
Smith William
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