当前位置: X-MOL 学术J. Membr. Sci. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Separation of major and minor lipid components using supercritical CO 2 coupled with cross-flow reverse osmosis membrane filtration
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2018-04-01 , DOI: 10.1016/j.memsci.2018.01.014
Karina Araus , Feral Temelli

Abstract A reverse osmosis polyamide membrane was used to test the feasibility of concentrating triacylglycerol (TAG) and α-tocopherol/β-sitosterol from model mixtures (Oleic Acid (OA)/TAG and OA/α-tocopherol/β-sitosterol, respectively) solubilized in SC-CO2 using cross-flow filtration regime. SG membrane was used for up to 26 h at pressures of 120 and 280 bar and temperature of 40 °C and its performance was measured in terms of CO2 flux and separation factor at a transmembrane pressure of 10 bar. Increasing the pressure to 280 bar resulted in a higher reduction in CO2 flux in comparison to that at 120 bar, which was attributed to fouling. CO2 flux was reestablished after cleaning with pure SC-CO2. Feed pressure of 120 bar showed the best separation factors, where the OA separation factor was higher than 1 and those for TAG and α-tocopherol/β-sitosterol were less than 1. The preferential permeation of OA through the reverse osmosis membranes in comparison to TAG and α-tocopherol/β-sitosterol could be attributed to the higher diffusivity of this smaller molecular weight compound and the effect of plasticization and swelling of the membrane upon exposure to SC-CO2. The cross-flow regime efficiently reduced the extent of fouling and subsequent decline of permeate flux. The findings demonstrate the potential to separate bioactive components present in vegetable oil deodorizer distillate and/or to deacidify vegetable oils using coupled supercritical and membrane technologies.

中文翻译:

使用超临界 CO 2 结合错流反渗透膜过滤分离主要和次要脂质成分

摘要 反渗透聚酰胺膜用于测试从模型混合物(分别为油酸 (OA)/TAG 和 OA/α-生育酚/β-谷甾醇)中浓缩三酰基甘油 (TAG) 和 α-生育酚/β-谷甾醇的可行性使用错流过滤方式溶解在 SC-CO2 中。SG 膜在 120 和 280 bar 的压力和 40 °C 的温度下使用长达 26 小时,并在 10 bar 的跨膜压力下根据 CO2 通量和分离因子测量其性能。与 120 巴相比,将压力增加到 280 巴会导致 CO2 流量降低更多,这归因于结垢。用纯 SC-CO2 清洗后重新建立 CO2 通量。120 bar 的进料压力显示出最好的分离因子,其中OA分离因子高于1,TAG和α-生育酚/β-谷甾醇的分离因子小于1。与TAG和α-生育酚/β-谷甾醇相比,OA通过反渗透膜的优先渗透可能是归因于这种较小分子量化合物的较高扩散率以及膜在暴露于 SC-CO2 时的塑化和溶胀效应。错流状态有效地减少了结垢的程度和随后的渗透通量的下降。研究结果证明了使用耦合超临界和膜技术分离植物油除臭馏出物中存在的生物活性成分和/或使植物油脱酸的潜力。与 TAG 和 α-生育酚/β-谷甾醇相比,OA 通过反渗透膜的优先渗透可归因于这种较小分子量化合物的更高扩散性以及膜在暴露于 SC-二氧化碳。错流状态有效地减少了结垢的程度和随后的渗透通量的下降。研究结果证明了使用耦合超临界和膜技术分离植物油除臭馏出物中存在的生物活性成分和/或使植物油脱酸的潜力。与 TAG 和 α-生育酚/β-谷甾醇相比,OA 通过反渗透膜的优先渗透可归因于这种较小分子量化合物的更高扩散性以及膜在暴露于 SC-二氧化碳。错流状态有效地减少了结垢的程度和随后的渗透通量的下降。研究结果证明了使用耦合超临界和膜技术分离植物油除臭馏出物中存在的生物活性成分和/或使植物油脱酸的潜力。错流状态有效地减少了结垢的程度和随后的渗透通量的下降。研究结果证明了使用耦合超临界和膜技术分离植物油除臭馏出物中存在的生物活性成分和/或使植物油脱酸的潜力。错流状态有效地减少了结垢的程度和随后的渗透通量的下降。研究结果证明了使用耦合超临界和膜技术分离植物油除臭馏出物中存在的生物活性成分和/或使植物油脱酸的潜力。
更新日期:2018-04-01
down
wechat
bug