Hydro-upgrading of algal bio-oil in tetralin for the production of high-quality liquid fuel: Process intensification

We report a new process to realize the deep removal of N, O, and S from the bio-oil when using a batch reactor to do the hydro-upgrading experiments. That is, within a fixed reaction time, hydro-upgrading of the bio-oil was carried out in several stages. After each stage reaction was finished, the r...

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Bibliographic Details
Published in:Fuel processing technology 2021-12, Vol.224, p.107034, Article 107034
Main Authors: Chen, Lei, Wang, Zhi-Cong, Chen, Dabo, Yin, Lin-Xin, Duan, Pei-Gao
Format: Article
Language:English
Subjects:
Ammonia
bio-oil
Catalysts
Denitrogenation
Deoxygenation
H2 replacement
Hydro-upgrading
Hydrothermal liquefaction
Liquefaction
Liquid fuels
Microalgae
Nuclear fuels
Process intensification
Reaction time
Treated bio-oil
Upgrading
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Summary:We report a new process to realize the deep removal of N, O, and S from the bio-oil when using a batch reactor to do the hydro-upgrading experiments. That is, within a fixed reaction time, hydro-upgrading of the bio-oil was carried out in several stages. After each stage reaction was finished, the reactor was cooled, and the gas in the reactor was replaced with fresh hydrogen, and then the reaction continued until the total reaction time was complete. A bio-oil produced from hydrothermal liquefaction of microalgae mixed with tetralin at a mass ratio of 1:1 was used as the feedstock. The experiments were performed at different temperatures (300–480 °C) and time (1–8 h) with fixed addition of 10 wt% Pt/C and 8 MPa H2. Higher treated bio-oil yield was always achieved if the reaction was performed in several stages. The N-, O-, and S- containing compounds in the gaseous products mainly consisted of C2H4N, C3H7N, C6H7N, NH3, (SCN)2, SO2, and H2O. The removal of these gas products avoided their secondary reactions with the bio-oil and slowed down the catalyst poisoning, and thus breaking through the equilibrium limitations of denitrogenation, desulfurization, and deoxygenation and prolonging the activity of the catalyst. [Display omitted] •Tetralin is a promising medium for the upgrading of bio-oil.•A new process was used to intensify the N, O, and S removal from algal bio-oil.•The removal of gas products avoided their secondary reactions with the bio-oil.•Increasing H2 replacement frequency reduced the N, O, and S contents of the treated bio-oil.•88% of the O, 92% of the N, and 100% of the S were removed from the algal bio-oil.
ISSN:0378-3820
1873-7188
DOI:10.1016/j.fuproc.2021.107034