Kinetic Study of Free Fatty Acid Adsorption Using Adsorbent in Sardine (Sardinella sp.) Oil Refining
Keywords:
adsorption, free fatty acid, kinetics model, purification, pseudo-second order, sardine oilAbstract
In Fish oil can be produced from fish meal industry by-products, but its fish oil has uninteresting color and high free fatty acids content so it needs to be purified. This study aimed to determine fatty acid profile of sardine oil, to determine free fatty acid adsorption kinetics model, and to determine sardine oil clarity after purification. Pseudo second order (k2) of attapulgite, bentonite, and chitosan treatment was 0.0344 g mg-1min-1, 0.0222 g mg-1min-1, and 0.0460 g mg-1min-1, respectively. The equilibrum adsorption capacity (qs) of attapulgite, bentonite, and chitosan treatment was 56.53 mg/gram, 42.40 mg/gram, and 47.11 mg/gram. The external film mass-transfer coefficient (KsA) was 0.0018 mL/s for attapulgite treatment, 0.0015 mL/s for chitosan treatment, and 0.0013 mL/s for bentonite treatment. The intraparticular diffusion coefficient (Kw) was 0.1542 mg mL-1 min-0.5 for attalpugite treatment, 0.1285 mg mL-1 min-0.5 for chitosan treatment, and 0.1156 mg mL-1 min-0.5 for bentonite treatment. Clarity for all treated fish oil increase with the increasing of adsorption time, and the equilibrum point has been reached at 60 minutes. Results indicated that attapulgite was the best adsorbent than chitosan and bentonite for free fatty acid removal from sardine oil.
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