<![CDATA[Used frying oil is the oil that used repeatedly. Â This oil has low quality physically and chemically. Â This research was objected to purify used frying oil from tempeh chips processing therefore it is suitable for consumption. Â The elucidated factors were HCl normality and zeolite activation temperature. Â This research used completely randomized design with two factors that arranged factorially. Â The first factor was HCl normality in zeolite soaking: without soaking (HCl 0 N), and soaking with HCl 2 N, 4 N, and 6 N. Â The second factor was ziolite activation temperature: 3000C, 4000C, 5000C, dan 6000C.The result showed that HCl normality and zeolite activation temperature were significantly affected the performance of zeolite. Â The color value, free fatty acid content, and anisidin value decreased as the HCl normality and activation temperature increased. Â It was supposed that the increasing HCl normality and activation temperature caused the ratio of Si/Al increased. Â It affected the capability of zeolite for adsorption. Â Meanwhile, the peroxide value increased as the HCl normality increased due to increasing polarity that caused by increasing Si/Al ratio. Â The best characteristic of purified used frying oil was obtained from HCl 6 N and activation temperature of 6000C with the characteristic as followed: color value that indicated by absorbance at 500 nm of 0.491, free fatty acid content of 0.5%, peroxide value of 0.094 meq/kg, and anisidine value of 43.92.Keywords: used frying oil, natural zeolite, activation]]>
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