Transesterification and Hydrotreating Reactions of Rice Bran Oil for Bio-Hydrogenated Diesel Production

Praepilas Dujjanutat, Nithinun Srihanun, Papasanee Muanruksa, James Winterburn and Pakawadee Kaewkannetra ()
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Praepilas Dujjanutat: Postdoctoral Training of Department of Biotechnology, Khon Kaen University, Khon Kaen 40002, Thailand
Nithinun Srihanun: Graduate School Khon Kaen University, Khon Kaen University, Khon Kaen 40002, Thailand
Papasanee Muanruksa: Postdoctoral Training of Department of Biotechnology, Khon Kaen University, Khon Kaen 40002, Thailand
James Winterburn: Department of Chemical Engineering and Analytical Science (CEAS), The University of Manchester, Manchester M13 9PL, UK
Pakawadee Kaewkannetra: Centre for Alternative Energy Research and Development (AERD), Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand

Energies, 2023, vol. 16, issue 3, 1-14

Abstract: Two different methods of production of bio-hydrogenated diesel (BHD), simply called green diesel from rice bran oil (RBO), were performed. In the first route, a direct hydrotreating reaction of RBO to BHD catalysed by Pd/Al 2 O 3 was performed in a high-pressure batch reactor. Operating conditions were investigated as follows: catalyst loading (0.5 to 1.5% wt.), temperature (325 to 400 °C), initial hydrogen (H 2 ) pressure (40 to 60 bar) and reaction time (30 to 90 min). The optimal condition was obtained at 1% wt catalyst loading, 350 °C, 40 bar H 2 pressure and 60 min. Yields of crude/refined biofuels and BHD achieved were approximately 98%, 81.71% and 73.71%, respectively. In another route, transesterification together with hydrotreating reactions of rice bran methyl ester (RBME) to BHD was performed using the optimal conditions obtained from the first route. The amount of 98% crude biofuel was obtained and was equivalent to production yields of refined biofuel (85.71%) and BHD (68.51%). Furthermore, physical and chemical properties of both RBO/RBME green diesel were also considered following ASTM standard methods. In summary, both catalytic reactions were achieved in the range of a low-speed industrial diesel and were further recommended for BHD or green diesel production from RBO.

Keywords: rice bran oil (RBO); transesterification; hydrotreating; bio-hydrogenated diesel (BHD); rice bran methyl ester (RBME); green diesel (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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