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Microcrystalline‐cellulose hydrolysis with concentrated sulphuric acid
Author(s) -
Camacho F.,
GonzálezTello P.,
Jurado E.,
Robles A.
Publication year - 1996
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/(sici)1097-4660(199612)67:4<350::aid-jctb564>3.0.co;2-9
Subject(s) - microcrystalline cellulose , cellulose , chemistry , hydrolysis , substrate (aquarium) , degree of polymerization , solubilization , sulfuric acid , kinetics , solubility , reaction rate constant , polymerization , chromatography , organic chemistry , polymer , biochemistry , oceanography , physics , quantum mechanics , geology
The effects of temperature (25–40°C), H 2 SO 4 concentration (31–70% (w/v)) and the acid/substrate relationship (1–5 cm 3 of H 2 SO 4 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 cm 3 g −1 and H 2 SO 4 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 k 1 and k 2 have been correlated with temperature, the H 2 SO 4 concentration and the acid/substrate relationship.