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 (CA_app) 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 CA_app 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 CA_app 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.

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。