Dissertation
ALTERNATIVE TRANSPORTATION FUELS PRODUCTION FROM COHYDROTREATMENT OF VEGETABLE OIL AND PYROLYSIS OILS DERIVED FROM BIOMASS AND TIRES
Doctor of Philosophy (PhD), Washington State University
01/2020
Handle:
https://hdl.handle.net/2376/112122
Abstract
Pyrolysis oils derived from biomass and tire are viscous, heavy, chemically unstable liquids that contain heteroatoms (O, S) therefore, cracking, stabilization, deoxygenation or desulfurization of these oils through catalytic hydrotreatment has become the crucial step to yield transportation fuels. The main challenge in such process is that undesirable polymerization and crosslinking reactions still readily occur, leading to catalyst deactivation and then stop the desired stabilization, cracking, deoxygenation/desulfurization reaction in hydrotreatment. Hydrogen-donor solvents had been proved to be effective in reducing the coke formation for pyrolysis oil hydrotreatment. However, such addition to the feed posed difficulty on the products-recovery process. In this dissertation we had carefully examined the vegetable oil to study its possibility to serve as an efficient hydrogen-donor solvent in hydrotreatment of pyrolysis oil from tires and biomass. Potential success on such coprocessing could not only result in the “drop-in” fuels with both aliphatic and aromatic hydrocarbons, but also provide ease to scale up the process by utilizing the existing infrastructure (HEFA process). We reported the hydrocarbon fuels production from cohydrotreatment of canola oil and pyrolysis tire oil. The yields of the liquid products were above 90.wt.% with very low yields of coke. Naphtha, kerosene, and diesel cuts can be readily obtained from these liquids, symbolizing the feasibility of the proposed cohydrotreatment. However, for cohydrotreatment of vegetable oil and bio-oil, a pretreatment is needed to remove the sugar fractions that been identified as the main precursors of coke formation. Liquid-liquid extraction was therefore designed to yield two separated phases with the major sugars removed with the aqueous phase. Ternary phase diagram was initially constructed for organic solvent/water/bio-oil and the results indicated that 1-butanol was the most effective organic solvent with which the highest separation factor between the sugars and phenols can be obtained at the desirable solvent/feed ratio. Our experimental studies demonstrated that cohydrotreatment of vegetable oil and the resulting lignin-rich fraction of bio-oil yielded up to 90 wt.% liquid products with the reduced coke formation. A synergetic effect was observed during cohydrotreatment of vegetable oil and lignin-rich oil. Once a hydrocracking of the lignin-rich oil was performed, the coke yield on the lignin-oil basis in the following cohydrotreatment can be lowered from 34.7 to 6.6 wt.%.
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Details
- Title
- ALTERNATIVE TRANSPORTATION FUELS PRODUCTION FROM COHYDROTREATMENT OF VEGETABLE OIL AND PYROLYSIS OILS DERIVED FROM BIOMASS AND TIRES
- Creators
- Yinglei Han
- Contributors
- Manuel Garcia-Perez (Advisor)Armando G McDonald (Committee Member)Jean-Sabin McEwen (Committee Member)Shulin Chen (Committee Member)Su Ha (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Biological Systems Engineering, Department of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 302
- Identifiers
- 99900581610401842
- Language
- English
- Resource Type
- Dissertation