<![CDATA[The use of energy increases related with the increasing of human population on earth, it is increases because human needs energy to move. Fossil energy is the energy that still become a primmadonna. The limited of energy resources in the middle of the increasing human energy needs from year to years (growth of energy consumption in 2004 amount 4.3%) Biodiesel is one of the biomassa fuel that can replacing fuel oil. Biodiesel can be produces from Jelantah oil that has a same type of biomassa. Jelantah oil can be con verted into biodiesel by using the transesterification that reacts the reacts the oil molecules with the alcohol and the catalyst to obtain methyl esters. One of the heating methods that can be used to convert oil into biodiesel is the microwave method. This microwave heating method utilizes the wave emission absorbed by the sample temperatures, so the teperatus can be higher than the surface temperature of the partition wall. There are several factors of making biodieses that can affect the heating process. The effect of the reaction time can be seen from the percent yield of biodiesel obtained. From the result of the research, the reaction time used 5, 10, 15 with the fixed temperature 55◦c, the optimum results are obtained at 15 minutes because the contact between subtances will be more higher so can reach the higher conversion. the process variable is the amount of NaOH catalyst observed in this experiment., the best conditions, the maximum yield of used wastewater biodiesel is 74.45% obtained using a mole ratio of 1: 6 wet / methanol oil at 60 ° C with a reaction time of 10 minutes and a 1.5% NaOH catalyst.]]>
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