Abstract

Biodiesel is a renewable energy, possesses high cetane number and flash points, resulting in its suitable uses in diesel machines and its safe distribution and storage, as well as low gas emission, and its function as lubricant. Disadvantages of the biodiesel include its high density and viscosity, resulting in plug and ineffective injection system, and low oxidation stability. This research studied about antioxidant additions to maintain oxidation stability of biodiesel. Induction period (IP) measuring kit, to measure oxidation stability, was constructed by using modified Rancimat principle. The best operation conditions were at temperature of 110 0 C and pressure of 6 hours).

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