A simplified kinetic model for continuous hydrotreating of HTL biocrude
Term
4. term
Education
Publication year
2020
Submitted on
2020-05-29
Pages
107
Abstract
In this study, two packed bed hydrotreating reactors are modelled with the purpose of estimating the kinetic parameters of deoxygenation and denitrogenation for a two-stage upgrading of biocrude produced from hydrothermal liquefaction (HTL). In order to simplify the many reactions happening during the process, the oxygen and nitrogen are lumped into a single compound each (O,N), whose concentration is equal to the concentration of O,N in the biocrude. Although the model showed good results up to 370oC, more severe conditions showed considerable errors for the N concentration. So, an optimization was performed, where the nitrogen was divided in two compounds, as "high" and "low" reactivity. Moreover, the study commenced with experimental work on hydrotreating of HTL miscanthus biocrude, under different temperatures, 250oC, 300oC and 350oC. This biocrude showed high instability, leading to the experiment at 350oC where coking reactions were predominant, encouraging the two-stage hydrotreating investigation.
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