Solvothermal Liquefaction of Blackcurrant Pomace in the Water-Monohydroxy Alcohol Solvent System

Mariusz Wądrzyk (), Łukasz Korzeniowski, Marek Plata, Rafał Janus, Marek Lewandowski, Grzegorz Borówka and Przemysław Maziarka
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Mariusz Wądrzyk: Faculty of Energy and Fuels, AGH University of Science and Technology, 30-059 Kraków, Poland
Łukasz Korzeniowski: Faculty of Energy and Fuels, AGH University of Science and Technology, 30-059 Kraków, Poland
Marek Plata: Faculty of Energy and Fuels, AGH University of Science and Technology, 30-059 Kraków, Poland
Rafał Janus: Faculty of Energy and Fuels, AGH University of Science and Technology, 30-059 Kraków, Poland
Marek Lewandowski: Faculty of Energy and Fuels, AGH University of Science and Technology, 30-059 Kraków, Poland
Grzegorz Borówka: ORLEN Południe S.A., 32-540 Trzebinia, Poland
Przemysław Maziarka: Faculty of Bioscience Engineering, Ghent University, 9000 Gent, Belgium

Energies, 2023, vol. 16, issue 3, 1-15

Abstract: Wet organic wastes are especially troublesome in valorization. Therefore, innovative solutions are still in demand to make valorization feasible. In this study, we tested a new transformation route of a blackcurrant pomace as a high-moisture industrial waste through a series of high-temperature and pressure solvothermal liquefaction experiments. The feedstock was directly converted under near-critical conditions of the binary solvent system (water/2-propanol). The goal was to examine the effect of conversion parameters (temperature, biomass-to-solvent ratio) on the change in the yield of resultant bioproducts, as well as the quality thereof. The experiments were conducted in a batch autoclave at a temperature between 250 and 300 °C. The main product of the transformation was liquid biocrude, which was obtained with the highest yield (ca. 52 wt.%) at 275 °C. The quality of biocrude was examined by ATR-FTIR, GC-MS, and elemental analysis. The ultimate biocrude was a viscous heterogeneous mixture containing various groups of components and exhibiting evident energy densification (ca. 145–153%) compared to the value of the feedstock. The proposed processing method is suitable for further development toward efficient valorization technology. More specifically, the co-solvent additive for liquefaction is beneficial not only for the enhancement of the yield of the desired product, i.e., biocrude, but also in terms of technological aspects (reduction of operational pressure and temperature).

Keywords: biocrude; binary solvent system; blackcurrant pomace; liquefaction; thermochemical conversion; waste valorization; biochar; bioproducts (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: 2023
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