#TITLE_ALTERNATIVE#

• Main Author: MARKOPALA PASANG (NIM 23004025), PATRIK
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/8914
• Institution: Institut Teknologi Bandung

The nowadays usual method of manufacturing biodiesel is by reacting vegetable oil with methanol/ethanol in the presence of catalyst. The vegetable oil raw material is obtained from the plant sources through pressing and/or extraction. The sequential operation of obtaining the vegetable oil followed by its conversion to biodiesel has made the total production cost of biodiesel (from its natural resources) relatively high and thus reduce the competitiveness of this clean and renewable fuel. Preparation of biodiesel by in situ transesterification (or simultaneous extraction and transesterification) proceeds without prior extraction of the vegetable oil raw material but directly macerating the oil source with methanol containing catalyst. Therefore, in situ transesterification has less operation stage and thus has a potential of reducing the cost of the biodiesel product.<p> <br /> <br /> <br /> <br /> <br /> The utilization of coconut oil for biodiesel will obviously compete those for food and oleochemical industries. One way to hinder this competition is to produce biodiesel from coconut meat press cake by in situ transesterification. The press cake still contain 12-15% oil, so that it is very potential to be used for making biodiesel. Up till now, the press cake is mostly utilized as animal feed. Utilization of the press cake for making biodiesel is expected to increased its economic value chain, especially in the coconut producing areas.<p> <br /> <br /> <br /> <br /> <br /> The aim of this research is to evaluate the effectiveness of in situ transesterification of coconut meat press cake to produce biodiesel. The in situ transesterification process were carried at 27 degrees and 60 degrees C , with the addition of potassium methoxide catalyst at 2, 3 and 4%-by weight of the press cake and with or without the presence of catalyst stabilizers (K3PO4, Na3PO4, KOOCCH3, NaOOCCH3).<p> <br /> <br /> <br /> <br /> <br /> Biodiesel obtained from in situ transesterification of coconut meat press cake at 27 degrees C, 3-4% catalyst and without the presence of catalyst stabilizer, has an acid value of 0.359-0.388 mg-KOH/g, total glycerol content of 0.174-0.197%, free glycerol content of 0.0028-0.0049% and alkyl ester content of 99.46-99.52%. This means that the biodiesel produced has a quality that fulfill the standard SNI-04-7182-2006. The highest yield of biodiesel is achieved at 27 degrees C, 3% catalyst and without catalyst stabilizer.