Effects of Plasma-Modified Polyvinylidenefluoride and Polyethersulfone Ultrafiltration (UF) Membrane Treatments on Quality of Soybean Oil

摘要: The effects of unmodified and surface-modified polyvinylidenefluoride (PVDF) polyethersulfone (PES) ultrafiltration membranes on quality crude soybean oil miscellas were studied. Membranes modified with hexamethyldisiloxane in radiofrequency plasma polymerization (PlzP) at 60 W or 75 W glow discharge power for 5 min. Contact angle results indicated an interfacial free energy increase between water solid surface by 2.1- 12.7-fold PVDF PES, respectively, after PlzP, i.e., both became more hydrophobic. Modified removed 10% fatty acids, 8–11% peroxides, maintained 2–5% tocopherols compared to those PES. Oxidation products color compound removal from similar the commercial bleaching step better than degumming-neutralization step. Total tocopherol loss during treatment was 5.3% 5.0–6.8% miscellas, these values far below any processing steps refining (10.4–28.4% loss). Practical Applications PlzP coating monomers a polymeric-based membrane changes membrane's chemical physical properties due series sequential reactions such as oxidation, degradation cross-linking. predominant determined mainly time. Thus, if one can adjust parameters properly, create tailor-made terms angstroms molecular/atomic level. minimal method plasma-modified PES described present study new practical approach remove undesirable components well oil-hexane meeting standards. It simultaneously preserves healthy minor found oil.