Judul: Pengaruh Penggunaan Adsorben  Dan Penggunaan Ulang Adsorben Hasil  Recycling Pada Proses Pemurnian Biodiesel  Minyak Jarak Pagar (Jatropha Curcas L.)
Abstrak: Biodiesel is an alkyl esther which potentially as renewable alternative energy. It could be produced from plant oil derivates such as jathropa pagar oil. Jathropha biodiesel is produced by estrans (esterification-transesterification) reaction. But, in the end of its making, there would be produced dirty biodiesel and another contaminants such as; residue of glycerol, non-reacted methanol, KOH residue and soap produced from the reaction between alkali and free fatty acid during the transesterification. That contaminant will impact the quality of its fuel and has been loosen from the product. Because of that, biodiesel has to be purified in order to have standardized quality that approximately with SNI 04- 7182-2006. The biodiesel purification is commonly used water (water washing method), but this washing method is still having so many weakness that in this research was done the biodiesel purification using adsorbent (dry washing method). This research was aimed to know the impact of adsorbent using and regenerated adsorbent reusing in jathropa biodiesel purification. This research is divided into two stage; introduction and main research. The introduction research was done to know the best adsorbent formulation between silica alumina and silica magnesium. The adsorbent formulation decision was done by some biodiesel characteristic analysis such as acid value, catalyst percentage, soap percentage, free glycerol, total glycerol and bounded glycerol. The experimental designed used in this stage was completely randomized design with one factor, that is adsorbent formulation (Z). The factor (Z) consisted of 8 treatment level, include silica alumina 100%, silica magnesium 100%, and the combination of those two with various comparation; that was 1:1, 1:2, 1:3, 2:3, 2:1, 3:1, and 3:2. In the main research, variety and adsorbent comparation that chose in the former research used for several times and looked the impact of quality characteristic of biodiesel. Before reused, the chosen adsorbent regenerated with water in the temperature of 65-70oC and recovery methanol. The characteristic biodiesel parameter that tested includes acid value, soap value, free glycerol, total glycerol and bounded glycerol. The process of adsorbent activation in biodiesel was significantly reduced the impurities of biodiesel. Based on previous research, best performance was the variety and comparation of 100% silica alumina. The characteristic of purified biodiesel which has been purified by the 100% silica alumina was having the acid value 0.4373 mg KOH/g biodiesel, undetected catalyst, soap contain 53,37 ppm, free glycerol 0,0054%, bounded glycerol 0.2490%, total glycerol 0.2544% and water contain. The result of the main research showed that silica alumina could be used for several times but there was reduction to the quality of the biodiesel. The reduction of biodiesel was significant until the third reuse but it still accomplish the SNI standards. The regeneration process of silica alumina with water 65-70oC produced better methanol compared with recovery methanol. The characteristic of purified biodiesel using first regenerated silica alumina with water in the temperature of 65-70oC was acid value 0.4211 mg KOH/ g biodiesel, undetected catalyst contain, soap contain 1034.5 ppm, free glycerol 0,0079%, bounded glycerol 0.0842%, and total glycerol 0.0921%. The characteristic of the biodiesel in second stage was having the acid
Keyword: