Effect of Accumulative Recycling of Aqueous Phase on the Properties of Hydrothermal Degradation of Dry Biomass and Bio-Crude Oil Formation

Siyuan Yin, Nianze Zhang, Chunyan Tian, Weiming Yi, Qiaoxia Yuan, Peng Fu, Yuchun Zhang and Zhiyu Li
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Siyuan Yin: School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
Nianze Zhang: School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
Chunyan Tian: School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
Weiming Yi: Shandong Research Center of Engineering and Technology for Clean Energy, Zibo 255000, China
Qiaoxia Yuan: College of Engineering, Huazhong Agricultural University, Wuhan 430070, China
Peng Fu: School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
Yuchun Zhang: School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China
Zhiyu Li: School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo 255000, China

Energies, 2021, vol. 14, issue 2, 1-19

Abstract: For hydrothermal liquefaction of dry biomass to produce liquid fuels, water needs to be added or the aqueous phase products can be recycled. This paper focuses on understanding the relationship between hydrothermal degradation of the dry biomass and oil formation under the condition of accumulative recycling of the aqueous phase. Completely dried corn stalk and deionized water were used for the hydrothermal liquefaction (HTL) experiment. The aqueous products for subsequent recycling were not diluted. It was demonstrated that the recycling of the aqueous can promote the enrichment of organic acids and the conversion of ketones and phenols in the aqueous, improving the yield and quality of Bio-crude oil. After recycling, the yield of Bio-crude oil increased from 20.42% to 24.31% continuously, and the oxygen content decreased from 13.34% to 9.90%. Although the process was accompanied by solid deposition and had a negative impact on the hydrothermal degradation efficiency, the formation of carbon microspheres during the deposition enhanced the utilization of nondegradable solids, while the formation of metal salt particles had a positive impact on oil production. After three rounds of recycling, the solid deposition effect was weakened. At this time, oil production and solids degradation can be promoted simultaneously.

Keywords: aqueous phase recycling; hydrothermal liquefaction; degradation; Bio-crude oil; solid deposition (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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