Separation of lycopene/solvent mixture by chitosan membranes

P Yodjun, K Soontarapa, C Eamchotchawalit


Acetone in view of lower toxicity could be used as extracting solvent of lycopene in tomato paste instead of hexane. The studied chitosan membranes were uncrosslinked and crosslinked types. It was found that the membrane morphology could be changed from porous to dense structure by increasing evaporation temperature or time or by crosslinking. They showed hydrophilicity but not preferred to both acetone and lycopene. The lycopene/acetone mixture could be separated by using water swollen chitosan membrane in pervaporation process. It was found that all studied membranes; i.e., both uncrosslinked and ionically crosslinked membranes prepared at 40 to 60C for 2 to 6 hours, could separate acetone from lycopene solution as permeate with rejection of 100% or separation factor of infinity. The uncrosslinked membrane prepared at 40C for 2 hours provided the highest acetone flux of 0.1310.004 L m-2 h-1 by operating at ?1 bar and 15 ppm feed concentration.

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Printed ISSN: 0857-6149

Online ISSN: 2630-0508