Alchris Woo Go, Thi Yen Nhu Pham, Chi Thanh Truong, Kristelle L. Quijote, Artik Elisa Angkawijaya, Ramelito C. Agapay, Chintya Gunarto, Yi-Hsu Ju, Shella Permatasari Santoso
This study provides kinetic and equilibrium information of the extraction of rice bran lipids using hexane from post-hydrolysis rice bran (PHRB). Rice bran (RB) is an agricultural residue with promising valorization potential in biodiesel production. In this study, native RB was subjected to dilute acid hydrolysis (DAH) with an acid solution 3 vol% using 95 wt% H2SO4 at 90 °C for 6 h, increasing the lipid density threefold. Batch extraction with hexane was carried out at various temperatures (30, 45, and 60 °C) and solvent to solid ratio (SSR, 4, 8, and 12 mL g−1). Improved extraction rates were observed at higher temperatures and lower SSRs. Regardless, ~90% of the extractable lipids were solubilized in hexane in less than 10 min. Data obtained were fitted with 5 different models. The extraction of lipids from RB and PHRB involves at least 2 mechanisms, a rapid washing step, and a diffusion step. The extraction process was found to be exergonic, endothermic, and irreversible. An SSR of 4 mL g−1 would require at least 5 ideal crossflow extraction stages for a lipid recovery of over 95%. Compared to RB, the extraction of lipids from PHRB provides potential solvent savings of ~80%. © 2020 Elsevier Ltd
Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Keelung Road, Taipei City, Da'an District, Taipei City, 10607, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Keelung Road, Taipei City, Da'an District, Taipei City, 10607, Taiwan; Department of Chemical Engineering, Can Tho University, Can Tho, Viet Nam; Taiwan Building Technology Center, National Taiwan University of Science and Technology, Keelung Road, Taipei City, Da'an District, Taipei City, 10607, Taiwan; Department of Chemical Engineering, Widya Mandala Surabaya Catholic University, Kalijudan, 37, Surabaya, 60114, Indonesia