Abstract This study aimed at investigating flaxseed (Linnum usitatissimum) oil extraction using subcritical propane. Extractions were performed in a laboratory scale unit at temperature (20–60 °C) and pressure (80–120 bar) experimental conditions. Subcritical extraction process kinetic aspects evaluation was performed using four mathematical models found in the literature. The subcritical propane process successfully extracted Omega 3-6-9 fatty acids presenting good yielding in the experimental conditions studied. Physical characterization for commercial and subcritical propane extraction oils presented 1.477 and 1.473 refractive indexes at 40 °C, respectively. The oil extracted using subcritical propane presented free fatty acid contents lower than commercial oil (0.95% wt vs 1.37% wt). The adjusted parameters models presented good fitting with the experimental data under the investigated conditions.

中文翻译：

---

亚临界丙烷提取亚麻籽油及模拟

摘要 本研究旨在研究使用亚临界丙烷提取亚麻籽 (Linnum usitatissimum) 油。在实验室规模的设备中在温度 (20–60 °C) 和压力 (80–120 bar) 实验条件下进行提取。使用文献中发现的四种数学模型进行亚临界萃取过程动力学方面的评估。亚临界丙烷工艺成功提取了 Omega 3-6-9 脂肪酸，在所研究的实验条件下表现出良好的产量。商业和亚临界丙烷萃取油的物理特性在 40 °C 下的折射率分别为 1.477 和 1.473。使用亚临界丙烷提取的油的游离脂肪酸含量低于商业油（0.95% wt vs 1.37% wt）。