The Journal of Supercritical Fluids ( IF 3.9 ) Pub Date : 2021-11-13 , DOI: 10.1016/j.supflu.2021.105470 Karina Araus 1 , Eileen Santos 1 , Ricardo Couto 1 , Feral Temelli 1
Polymeric reverse osmosis membranes have been employed to separate lipid mixtures using supercritical carbon dioxide (SC-CO2), where the operating conditions and solute-solvent-membrane interactions affect the separation. To understand these interactions, the wetting phenomena was studied by determining the apparent contact angles (CAapp) of oleic acid (OA) and triolein (TO) in air (22 °C/1.01 bar) and SC-CO2 (40 °C/120 bar) on a commercial SG membrane over 1 s. Under atmospheric conditions, the CAapp of OA (49.74° ± 0.64°) and TO (56.80° ± 1.05°) at 0 s showed a difference, indicating stronger affinity of the membrane for OA. The CAapp of OA (37.33° ± 0.27°) and TO (53.92° ± 0.86°) decreased under SC-CO2. This decrease was greater for OA due to its higher solubility and lower interfacial tension in SC-CO2 than TO. The findings indicate that SC-CO2 enhances the wetting behavior of OA and thus SG membrane processing coupled with SC-CO2 may have potential to separate OA from complex lipid mixtures.
中文翻译:
SC-CO2环境下反渗透膜上油酸和油酸甘油酯的表观接触角
聚合物反渗透膜已被用于使用超临界二氧化碳 (SC-CO 2 )分离脂质混合物,其中操作条件和溶质-溶剂-膜相互作用会影响分离。为了理解这些相互作用,通过确定油酸 (OA) 和三油精 (TO) 在空气 (22 °C/1.01 bar) 和 SC-CO 2 (40 °C ) 中的表观接触角 (CA app ) 来研究润湿现象/120 bar) 在商用 SG 膜上超过 1 秒。在大气条件下,OA (49.74° ± 0.64°) 和 TO (56.80° ± 1.05°) 在 0 s的 CA app表现出差异,表明膜对 OA 的亲和力更强。SC-CO下OA(37.33°±0.27°)和TO(53.92°±0.86°)的CA app降低2 . 由于 OA 在 SC-CO 2 中的溶解度更高且界面张力比 TO更低,因此 OA 的这种降低更大。研究结果表明 SC-CO 2增强了 OA 的润湿行为,因此与 SC-CO 2结合的 SG 膜处理可能具有将 OA 从复杂的脂质混合物中分离出来的潜力。