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14-12-2018 | Original Research

Influence of residual lignin and thermal drying on the ultrastructure of chemical hardwood pulp and its enzymatic hydrolysis properties

Authors: Yaping Li, Bo Li, Wenxuan Mo, Wenjing Yang, Shubin Wu

Published in: Cellulose | Issue 3/2019

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Abstract

Recycled pulp can be used as a potential and sustainable resource for production of fermentable monosaccharides. In this work, the effects of residual lignin and thermal drying on ultrastructure, physical properties and further enzymatic digestibility of chemical pulps were investigated. The results showed that drying process (at 105 °C for 24 h) did not significantly change the functional groups but it resulted in increased cellulose crystallinity and fibril aggregation, pore shrinkage and decreased swelling ability of fibers. On the other hand, residual lignin (~ 3%) in unbleached pulp restrained partially the deterioration of those properties during drying, compared to bleached pulp (lignin content 0.3%). Compared with once-dried bleached pulp, the unbleached pulp after drying had a slightly higher proportion of amorphous region, higher average pore size and specific surface area, and lower hornification degree, which are favorable for enzymatic hydrolysis. Moreover, the fibrils may have wrapped the lignin when they aggregated, reducing the unfavorable adsorption of lignin to cellulase. Enzymolysis also showed that the once-dried unbleached pulp was much easier to digest, and yielded 66% glucose after 12-h hydrolysis, which was much higher than the yield (54%) of the once-dried bleached pulp and should have good prospects.

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Title: Influence of residual lignin and thermal drying on the ultrastructure of chemical hardwood pulp and its enzymatic hydrolysis properties
Authors: Yaping Li
Bo Li
Wenxuan Mo
Wenjing Yang
Shubin Wu
Publication date: 14-12-2018
Publisher: Springer Netherlands
Published in: Cellulose / Issue 3/2019
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-018-2184-6

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