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%.

这项研究提供了从水解后米糠（PHRB）中使用己烷提取米糠脂质的动力学和平衡信息。米糠（RB）是一种农业残留物，在生物柴油生产中具有潜在的增值潜力。在这项研究中，天然RB在90°C下使用95 wt％H ₂ SO ₄在3vol％的酸溶液中进行了6h的稀酸水解（DAH），使脂质密度增加了三倍。在各种温度（30、45和60°C）和溶剂与固体比（SSR，4、8和12 mL g ^-1）下，用己烷分批萃取）。在较高的温度和较低的SSR下观察到提取率得到了提高。无论如何，在不到10分钟的时间内，约有90％的可提取脂质溶解在己烷中。将获得的数据与5种不同模型拟合。从RB和PHRB中提取脂质涉及至少两种机理，快速洗涤步骤和扩散步骤。发现提取过程是强力的，吸热的和不可逆的。SSR为4 mL g ^-1时，至少需要5个理想的错流萃取阶段，脂质回收率才能达到95％以上。与RB相比，从PHRB中提取脂质可节省约80％的溶剂。