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Primata Mardina
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PENURUNAN ANGKA ASAM PADA MINYAK JELANTAH Primata Mardina; Erlyta Faradina; Netty Setiawati
Jurnal Kimia (Journal of Chemistry) Vol. 6, No. 2 Juli 2012
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Acid number expresses free fatty acid content that has effect on quality of oil and fat product. High acid number in resulted from hydrolysis process that occurred during frying. Acid number could be reduced by adsorption. The objective of this research was to reduce acid number from waste cooking oil using adsorption process. The activated carbon from coconut shell was used as adsorbent. A specific amount of adsorbent was added into 150 grams of waste cooking oil, and the process was carried out with certain range of operation time. Stirring speed and temperature of adsorption process were maintained constant at 500 rpm and 27oC. The result showed free fatty acid adsorption or reduction in acid number efficiencies increase with higher adsorbent doses. Based on the result, the reduction in acid number of waste cooking oil using activated coconut shell carbon followed the Freundlich-type isotherms.
PENGARUH KECEPATAN PUTAR PENGADUK DAN WAKTU OPERASI PADA EKSTRAKSI TANNIN DARI MAHKOTA DEWA Primata Mardina; Eka N. Astarina; Septriani Aquarista
Jurnal Kimia (Journal of Chemistry) Vol. 5, No. 2 Juli 2011
Publisher : Program Studi Kimia, FMIPA, Universitas Udayana (Program of Study in Chemistry, Faculty of Mathematics and Natural Sciences, Udayana University), Bali, Indonesia

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Abstract

Tannin is one of the chemical compounds which contained in mahkota dewa fruit. The experiment investigated the effects of agitation speed and operation time on percentages of tannin extracted and mass transfer coefficient of tannin extraction process from mahkota dewa. This experiment was conducted in a three neck flask which equipped with mechanical stirrer, condenser, thermometer and heater medium. The sample was heated to 50oC and maintained at that temperature during extraction. The extraction was timed as soon as the mechanical stirrer was turned on. Samples were drawn at specified time interval of 0, 15, 30, 60, 120, 180 and 240 minutes. The result showed that increasing agitation speed and operation time increased the percentage of tannin extracted and mass-transfer coefficient. The highest percentage of tannin extracted was 8,0458% at agitation speed of 700 rpm for 240 minutes and the highest mass-transfer coefficient was 0,03/minute at agitation speed 700 rpm
Co-Authors Eka N. Astarina Erlyta Faradina Netty Setiawati Septriani Aquarista