Permeability of Cane Juice in Ultrafiltration Membranes of Acrylic Vinyl Co-Polymer and Cellulose Acetate

Abstract

The effects of membrane permeability on the flux and quality of raw and limed cane juice on ultrafiltration were studied by 2-3 h long-term testing(of several types with molecular weight cut-off levels from 50 000 to 100 000). The flux through XM-50, XM-100 and A-50 Tmembranes for raw juice remained at the value of about 0.100 ml·cm_-2·nub_>-1 until permeation volume of 250 ml, but it then decreased gradually. The flux of A-50T membrane was the greatest at the initial stage(with O.140 ml·cmcm_-2·min_-1), and then decreased gradually d gradually when juice limed to pH 8.1 at 10°C was used. The flux of juice limed to pH 7.0 at 85°C showed remarkably high value (at the initial stage), however it decreased rapidly with increasing permeate volume. The flux of A-50T membrane showed comparatively lower value than that of XM-membranes. The sucrose rejection of the permeate with the XM-50, XM-100 and A-50T membranes was 2, 2-5 and 5-7% for juice limed to pH 7.0 at 85°Crespectively.