Processing of crude palm oil with ceramic microfiltration membrane

Membrane separation technology offers a potential application in the proces sing of crude palm oil. Ceramic membranes with different pore diameters (0. 45 and 0.2 micron) were used to conduct the study on micromembrane process. Quality parameters of membrane-processed oils examined included free fatty acid (FFA), carotene, fatty acid composition (FAC), phosphorus and iron co ntents. The effect of operating parameters such as transmembrane pressure, feed flow and time on permeate flux were evaluated. It was found that 'Cera flo' ceramic membrane with a pore size of 0.45 micron was only able to reje ct 14% of phosphorus from the crude oil. Ceramic membrane with pore size of 0.2 micron showed a better phosphorus rejection of 56.8%. The permeate was found to contain 7.13 ppm of phosphorus. The 0.2 micron membrane was also able to remove more than 80% of the iron from crude palm oil. Pore sizes fo r both membranes were not small enough to remove other components such as F FA, and carotene Both membranes showed a similar trend in which the permeat e flux increased with transmembrane pressure and feed flow until a certain limit where the flux declined with increasing pressure and feed flow. The l imits in transmembrane pressures for membrane with pore sizes of 0.45 and 0 .2 micron were 1.65 and 1.25 bar, respectively. Whereas the limits in feed flow for 0.45 micron and 0.2 micron membranes were 9.2 and 9.8 L/min, respe ctively. The flux decline of filtered oil through 'Ceraflo' ceramic membran e was rapid, but found to be quite stable for the period of 5 h of processi ng after an initial decline.