Application of Proton Ionic Liquid in the Process of Obtaining Bioethanol from Hemp Stalks

Małgorzata Smuga-Kogut (), Bartosz Walendzik, Katarzyna Lewicka-Rataj, Tomasz Kogut, Leszek Bychto, Piotr Jachimowicz and Agnieszka Cydzik-Kwiatkowska ()
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Małgorzata Smuga-Kogut: Department of Agrobiotechnology, Faculty of Mechanical Engineering, Koszalin University of Technology, Raclawicka 15-17, 75-620 Koszalin, Poland
Bartosz Walendzik: Faculty of Civil Engineering, Environmental and Geodetic Sciences, Koszalin University of Technology, Sniadeckich 2, 75-453 Koszalin, Poland
Katarzyna Lewicka-Rataj: Water Management Laboratory, Faculty of Civil Engineering, Environmental and Geodetic Studies, Koszalin University of Technology, Sniadeckich 2, 75-453 Koszalin, Poland
Tomasz Kogut: Department of Geodesy and Offshore Survey, Maritime University of Szczecin, Waly Chrobrego 1-2, 70-500 Szczecin, Poland
Leszek Bychto: Department of Electronics, Faculty of Electronics and Computer Science, Koszalin University of Technology, Sniadeckich 2, 75-453 Koszalin, Poland
Piotr Jachimowicz: Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709 Olsztyn, Poland
Agnieszka Cydzik-Kwiatkowska: Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Słoneczna 45G, 10-709 Olsztyn, Poland

Energies, 2024, vol. 17, issue 4, 1-15

Abstract: In this work, hemp ( Cannabis sativa L.) stalks were pretreated with pyrrolidinium acetate [Pyrr][AC] to increase the availability of cellulose for cellulolytic enzymes and thus improve the production of 2G ethanol from reducing sugars. The process was carried out under different temperature and time conditions: The control sample was raw material and deionized water, and the second sample was kept at 21 °C for 24 h. The third sample was kept at 90 °C for 30 min, and the fourth sample was kept at the same temperature for 24 h. For each pretreatment, the extraction of lignin and hemicellulose was determined, as well as the change in biomass composition before and after pretreatment. The stalks of hemp seed contained 41.54% cellulose, 18.08% lignin and 28. 87% hemicellulose. [Pyrr][AC] used to dissolve seed hemp at 90 °C for 24 h was most effective in the extraction of this biopolymer, extracting 3.1% content. After enzymatic hydrolysis, the highest content of reducing sugars was found for samples of hemp stalks that were first pretreated with proton ionic liquid (PIL) and stirred at 90 °C for 24 h. On the other hand, the highest ethanol content (5.6 g/L) after fermentation and yeast viability (56.7%) after 72 h were obtained in samples pretreated at 90 °C and for 24 h.

Keywords: bioethanol; enzymatic hydrolysis; FTIR; hemp stalks; pyrrolidinium acetate (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: 2024
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