|dc.description.abstract||Biodiesel was one of the most promising alternative renewable fuels to substitute the
conventional fossil fuel. In this tropic, the production of biodiesel from low value
waste vegetable oil (WVO) via alkaline catalyzed transesterification was studies.
Characteristic of waste vegetable oil such as moisture content, acid value, and free
fatty acid content and saponification value were studied. Its moisture content was
determined to be 1.45 % in weight percentage. High acid value of WVO was 1.30 ±
0.02 mg KOH / g could cause soap formation in which lower the biodiesel yield. First
acid pre-esterification step of WVO was carried out at methanol / oil ratio of 6:1, with
using 1.0 % wt of sulphuric acid at reaction temperature of 50 ºC and time of 60 min.
Second step, transesterification reaction was performed with using NaOH catalyst.
The parameters in this study were molar ratio of methanol to oil and catalyst
concentration. Methanol to oil molar ratio was prepared in 6:1, 9:1, and 12:1, whereas
concentration of catalyst used was 0.5 %, 1.0 % and 1.5 % wt (based on oil weight).
Highest biodiesel yield was 82.4 % in 6:1 molar ratio of methanol to oil, with 0.5 % of
NaOH concentration. With achieved optimal condition, production of biodiesel
process was designed using SuperPro Designer with a productive plant of
approximately 1,268 metric tons per year. In this study, the achievement of economic
evaluation for biodiesel production was done.||en_US