Penentuan Tahanan Nanofiltrasi Menggunakan Model Tahanan Seri Pada Pemisahan Beta-Karoten dan Alfa-Tokoferol Minyak Sawit Dalam Isopronal

Abstract

Palm oil contains high concentration of carotenoids anf tochoperols that can be recoveredby adsorption using attapulgite and desorption in isopropanol and then applying membrane technology to separate the beta-carotene and alpha-condition of nanofiltration and to obtain resistance of membranes using the series resistance model. titania membraneswith different pore diameters (5 and 10 nm) were used to conduct the study on nanofiltration membranes. Applied pressure was range from 1.5 to 2.5 bar and crossflow velocity was range from 0.14 to 0.97 m s-1. It was found that membrane 5 nm had optimum transmembrane pressure at 2 bar and feed flow velocity at 0.42 m s-1 with permeate flux 0.96 L m-2 h-1. On n the other side, membrane 10 nm had optimum transmembrane pressure at 2.2 bar and feed flow velocity at 0.69 m -1' with permeate flux 2.4 L m-2 h-1 . The intrinsic membrane resistances, Rm, the total membrane resistances, R'm, and the fouling T esistances, Rf, of membrane 5 nm were 0.25, 2.08 and 1.29 bar m2 h -1, respectively, with the resistance index, Ø, was 1.04 m2 h -1. On the other side, membrane 10 nm had Rm, R'm and Rf 0.78, 0.49 and 0.24 bar m2 h L-1, respectively, with 0 was 0.42 m2 h L-I. The conclusion of this research is nofiltration 5 and 10 nm are ineffective to separate beta-carotene and alpha- tocopherol in isopropanol because permeate flux and rejection are very low with resistances of membranes and resistance index are very high. So that to increase V g gg the permeate flux and rejection needed study about usage of different membrane and solvent type, conditioning of feed and controlling of aggregate alpha- tocopherol in isopropanol.