Dissertation
SIZE REDUCTION AND SULFITE PRETREATMENT OF SOFTWOOD FOR EFFICIENT HYDROLYSIS AND HIGH-VALUE PRODUCTS YIELD
Doctor of Philosophy (PhD), Washington State University
01/2016
Handle:
https://hdl.handle.net/2376/109933
Abstract
Bio-fuel production attracted many attentions from researchers due to the increasing shortage of fossil fuel and environment issues. Current bioconversion process emphasizes on fermentable sugar conversion to ethanol without sufficient utilization of co-products in this process. Confronted with challenges from both economic and academic perspective, industrialization of bio-fuel production needs further exploration.
In this research, we propose to employ milling process and subsequent sulfite method to pretreat Douglas-fir (Pseudotsuga menziesii) to achieve multiple products yield and efficiently consequent enzymatic hydrolysis. Firstly, we will investigate the correlations between specific energy consumption and physical properties of resulting wood particles of coarse milling. Secondly, size effect on multiple products yield in sulfite pretreatment will be examined under different temperatures. Furthermore, kinetics was investigated to describe the pretreatment process in terms of monomeric sugar production and degradation products formation. In addition, residual solids from enzymatic hydrolysis will be further treated to upgrade the utilization of residual lignin and carbohydrates. Additionally, the influences of ultrastructure changes induced by fine milling on sugar yields and chemicals products were studied.
Investigating specific energy consumption and physical properties of grindings can assist monitoring and estimating energy input in preparing feedstock. Multiple products in pretreatment process will increase biomass utilization and increase extra economic benefits. Kinetic modeling of pretreatment process will unfold the reactions in pretreatment process and facilitate industrial production in determining parameters of pretreatments aiming at different products. Also, sufficient utilization of lignin also will increase the portfolio of bio-fuel production. At last, disclosing the mechanism of mechanical treatment effects on thermochemical pretreatment will assist pretreatment condition optimization.
Metrics
Details
- Title
- SIZE REDUCTION AND SULFITE PRETREATMENT OF SOFTWOOD FOR EFFICIENT HYDROLYSIS AND HIGH-VALUE PRODUCTS YIELD
- Creators
- Yalan Liu
- Contributors
- Michael P Wolcott (Advisor)Jinwen Zhang (Committee Member)Karl Englund (Committee Member)Jinwu Wang (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Materials Science and Engineering Program
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 137
- Identifiers
- 99900581520101842
- Language
- English
- Resource Type
- Dissertation