Development of non-derivatizing hydrate salt pre-treatment solvent for pre-treatment and fractionation of corn cob
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Date
Authors
Ejekwu, Olayile
Ayeni, Augustine Omoniyi
Sadare, Olawumi Oluwafolakemi
Daramola, Michael Olawale
Journal Title
Journal ISSN
Volume Title
Publisher
Cogent OA
Abstract
Major concern in beneficiating lignocellulose is overcoming biomass
recalcitrance through pre-treatment. Molten hydrate salts (MHS) is a green solvent
with ability to swell and dissolve cellulose and biomass in a non-derivatizing way.
Over the last decade, MHSs have been used for isolated cellulose dissolution,
however very few studies have been reported on their effectiveness in pre-treating
lignocellulosic biomass. Therefore, effectiveness of their application as solvent for
pre-treating and fractionating corn cob is presented in this article. In this study,
seven molten hydrate salt pre-treatment solvent systems such as unary, binary and
ternary mixtures of ZnCl2.4H2O, LiClO4.3H2O and Urea were investigated for their
ability to pre-treat and fractionate biomass. The pre-treatment experiments were
carried out in a shaking incubator at 70°C for 60 minutes at a biomass: solvent ratio
of 1:10. The surface chemistry of the biomass was checked before and after pretreatment using Fourier Transform infrared spectroscopy. X-ray diffraction and
scanning electron microscopy were employed to check the crystallinity and surface
morphology of the biomass. Physicochemical analysis consistently indicated
a disruption in the structure of corncob due to removal of lignin and hemicellulose
during the pre-treatment process. Additionally, results showed a decrease in crystallinity and a change in surface morphology after the pre-treatment using all the
seven solvent systems (MHS solvents). The use of ZnCl2.4H2O/ Urea solvent displayed 100% recovery of cellulose, 42% recovery of hemicellulose and 44% recovery of lignin from the corn-cob when compared to the performance of the other
proposed solvent systems in this study.
Description
Keywords
Pre-treatment, Fractionation, Corn cob, Chemical engineering, Biochemical engineering, Bioconversion, Bioenergy, Molten hydrate salts (MHS)
Sustainable Development Goals
Citation
Olayile Ejekwu, Augustine Omoniyi Ayeni, Olawumi Sadare & Michael
Olawale Daramola (2021) Development of non-derivatizing hydrate salt pre-treatment solvent
for pre-treatment and fractionation of corn cob, Cogent Engineering, 8:1, 1947444, DOI:
10.1080/23311916.2021.1947444.