ISSN:
0268-2575
Keywords:
acid hydrolysis
;
pretreatments
;
cellulose
;
cellulose solubilization
;
Chemistry
;
Biochemistry and Biotechnology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Process Engineering, Biotechnology, Nutrition Technology
Notes:
The effects of temperature (25-40°C), H2SO4 concentration (31-70% (w/v)) and the acid/substrate relationship (1-5 cm3 of H2SO4 per g-1 of cellulose) on the solubilization rate of microcrystalline cellulose and on the glucose production rate have been analysed. The solubilization process was by determining reducing groups present in solution. For acid/substrate relationships of more than 1 cm3 g-1 and H2SO4 concentrations of greater than 62% (w/v), the acid promoted the total solubilization of the cellulose in the form of chains with a low degree of polymerization within 4 h. The solubilization demonstrated zero-order kinetics in which the specific rate and time of total solubilization are a function of the variables in operation. Glucose was produced according to a mechanism of two consecutive first-order pseudo-homogeneous reactions. The values of the kinetic constants k1 and k2 have been correlated with temperature, the H2SO4 concentration and the acid/substrate relationship.
Additional Material:
6 Ill.
Type of Medium:
Electronic Resource
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