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Toward an integrated approach to a sustainable biorefinery using the ionoSolv process
File(s)
Author(s)
Tian, Bing
Type
Thesis
Abstract
Lignocellulosic biomass and Algae are feedstocks that hold great potential in production of sustainable biofuels, materials and chemicals. This work focusses on the application of ionic liquid based fractionation of lignocellulosic biomass and algae.
Firstly, the pretreatment of Miscanthus x giganteus using different ionic liquid with low concentration was performed. The delignification yield increased gradually as concentration of ionic liquids go higher. Dilute triethylammonium hydrogen sulphate with different cation: anion ratio was used in pretreatment of miscanthis, pine and willow. The results showed increased removal of cellulose, hemicellulose and lignin with lower cation: anion ratio. Liquor analysis on liquid phase after pretreatment using triethylammonium hydrogen sulphate on Miscanthus under varies of conditions indicate that hemicellulose removal rate is better under conditions of higher temperatures and longer reaction time.
Secondly, Algae fractionation using ionoSolv process was tested. Among all seaweeds tested, Posidonia oceanica showed high saccharification yield after pretreatment under very mild conditions. Finally, 2-stage pretreatment aiming to remove hemicellulose and lignin in two separate steps was carried out. The results showed promising hemicellulose removal and delignification yield with promising saccharification yield. A further study on using recycled ionic liquid in the 2nd stage pretreatment has demonstrated consistent results of effective pretreatment over 5 cycles.
Firstly, the pretreatment of Miscanthus x giganteus using different ionic liquid with low concentration was performed. The delignification yield increased gradually as concentration of ionic liquids go higher. Dilute triethylammonium hydrogen sulphate with different cation: anion ratio was used in pretreatment of miscanthis, pine and willow. The results showed increased removal of cellulose, hemicellulose and lignin with lower cation: anion ratio. Liquor analysis on liquid phase after pretreatment using triethylammonium hydrogen sulphate on Miscanthus under varies of conditions indicate that hemicellulose removal rate is better under conditions of higher temperatures and longer reaction time.
Secondly, Algae fractionation using ionoSolv process was tested. Among all seaweeds tested, Posidonia oceanica showed high saccharification yield after pretreatment under very mild conditions. Finally, 2-stage pretreatment aiming to remove hemicellulose and lignin in two separate steps was carried out. The results showed promising hemicellulose removal and delignification yield with promising saccharification yield. A further study on using recycled ionic liquid in the 2nd stage pretreatment has demonstrated consistent results of effective pretreatment over 5 cycles.
Version
Open Access
Date Issued
2017-10
Date Awarded
2018-02
Copyright Statement
Attribution NoDerivatives 4.0 International Licence (CC BY-ND)
License URL
Advisor
Hallett, Jason
Publisher Department
Chemical Engineering
Publisher Institution
Imperial College London
Qualification Level
Doctoral
Qualification Name
Doctor of Philosophy (PhD)