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Dilute acid hydrolysis of paper birch: Kinetics studies of xylan and acetyl‐group hydrolysis
Author(s) -
Maloney Mark T.,
Chapman Thomas W.,
Baker Andrew J.
Publication year - 1985
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.260270321
Subject(s) - xylan , chemistry , hydrolysis , cellulose , sulfuric acid , residue (chemistry) , acid hydrolysis , kinetics , organic chemistry , glucomannan , chromatography , biochemistry , physics , quantum mechanics
Batch hydrolysis kinetics of paper birch ( Betula papyrifera ) xylan and its associated acetyl groups in dilute sulfuric acid have been measured for acid concentrations of between 0.04 and 0.18 M and temperatures of between 100 and 170°C. Only 5% of the cellulose was hydrolyzed for up to 85% xylan removal. Rate data were correlated well by a parallel reaction model based on the existence of reactive and resistant xylan portions. The resulting rate equation predicts the experimental xylan concentrations in the residue to within 10%. Hydrolysis of xylan‐associated acetyl groups was found to occur at the same rate as that of xylan, except at 100°C, where acetyl is released preferentially. No effect of acid concentration on the rate of acetyl removal relative to that of xylan was evident.