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

• 出版年: Energies
• 主要な著者: Praepilas Dujjanutat, Nithinun Srihanun, Papasanee Muanruksa, James Winterburn, Pakawadee Kaewkannetra
• フォーマット: 論文
• 言語: 英語
• 出版事項: MDPI AG 2023-01-01
• 主題: rice bran oil (RBO); transesterification; hydrotreating; bio-hydrogenated diesel (BHD); rice bran methyl ester (RBME); green diesel
• オンライン･アクセス: https://www.mdpi.com/1996-1073/16/3/1347

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/Al₂O₃ 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 (H₂) 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 H₂ 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.