Effects of the aqueous phase recycling on bio-oil yield in hydrothermal liquefaction of Spirulina Platensis, α-cellulose, and lignin

Haitao Chen, Zhixia He, Bo Zhang, Huan Feng, Sabariswaran Kandasamy and Bin Wang

Energy, 2019, vol. 179, issue C, 1103-1113

Abstract: The utilization of hydrothermal liquefaction (HTL), an efficient thermochemical conversion technology, can produce biofuels from biomass, but also a large amount of processing wastewater. In the present paper, the aqueous phase from the HTL of Spirulina Platensis was recycled as the intermediate reactant and its effects on the bio-oil yield from the HTL of Spirulina Platensis, α-Cellulose, and Lignin were investigated. The results revealed that the best bio-oil yields obtained from HTL of Spirulina Platensis and α-Cellulose in pure water were 30 and 7.03 wt% at the optimized operation conditions. Aqueous phase obtained from HTL of Spirulina Platensis could be introduced return into HTL system and result in an obvious increase in the bio-oil yield by 10 wt% and 6 wt% from HTL of Spirulina Platensis and α-Cellulose, respectively. Energy recovery rates from bio-oil were improved greatly by applying aqueous phase recycling during HTL. However, aqueous phase recycling inhibited generation of bio-oil, suggesting the presence of the antagonistic reaction between protein aqueous and Lignin. Based on the gas chromatography-mass spectrometer (GC-MS) and fourier transform infrared spectroscopy (FT-IR) analysis of the aqueous phase and bio-oil, the possible reaction pathways were deduced.

Keywords: Hydrothermal liquefaction; Spirulina platensis; Aqueous phase recycling; Aqueous phase; Bio-oil (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (12)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:179:y:2019:i:c:p:1103-1113

DOI: 10.1016/j.energy.2019.04.184

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