Kinetics Study on Production of Multi-feedstock Biodiesel
Hertanto, Melynda Christiana Rarasati, Apsari Puspita Aini, Hadiyanto
1 Department of Chemical Engineering, Diponegoro University, Indonesia
2 Center of Biomass and Renewable Energy, Diponegoro University, Indonesia
Abstract
Biodiesel can be produced from various vegetable oils, and animal fat. The abundant sources of vegetable oil in Indonesia such as calophyllum inophyllum, ricinus communis, soybean oil, corn oil, palm oil, and waste cooking oil were used as raw materials. Multi-feedstock biodiesel were used in this study to increase the flexibility operation of biodiesel production. This study was conducted to determine the effect of combination vegetable oils in the characteristic of biodiesel, and to determine the kinetic rate of the variables. Proses of esterification were applied for high free fatty acid feedstock before trans-esterification process which combine with other vegetable oils. Potassium hydroxide was used as homogenous catalyst, and methanol as another raw material. Acid value of calophyllum inophyllum can decrease from 54 mg KOH/gr oil to 2.15 mg KOH/gr oil after two steps of esterification. Biodiesel yield from multi-feedstock was obtained 71.42% with molar ratio methanol to oil 6:1, temperature 60°C, and 1%wt catalyst for 2 hr reaction time.
Keywords: multi-feedstock biodiesel, trans-esterification, calophyllum inophyllum, palm oil, waste cooking oil.
Topic: Bioenergy