Vegetable oil degumming with polyimide and polyvinylidenefluoride ultrafiltration membranes

摘要: The removal of phospholipids (‘degumming’) is the first step in process refining crude vegetable oil. Membrane separation has been often proposed as an alternative to conventional procedure (water degumming). Until now, instability polymeric membranes organic solvents major obstacle applying this technique. In work, a local synthesized polyvinylidenefluoride (PVDF) and commercial polyimide (PI) membrane were evaluated for their flux rejection properties during degumming soybean oil laboratory-scale cross-flow ultrafiltration cell. Degumming experiments done at different temperatures feed flows, keeping constant both concentration transmembrane pressure. PVDF PI gave selectivity values permeate color that did not differ significantly from each other. Retention coefficients larger than 98% obtained all cases. every experiment, decline with time occurred beginning process. By increasing rate, higher was obtained. results show had productivity one. Copyright © 2003 Society Chemical Industry