3.1. Characterization of coconut waste oil
Hexane was used as co-solvent throughout the oil extraction
process. Hexane improves the mass transfer and diffusivity of oil
with the seed if compared with other solvent such as methanol.
Coconut waste oil is mainly composed of saturated short length
fatty acid chains, 2.3% of C8:0, 30.7% of C12:0, 17.91% of C14:0,
17.69% of C16:0, 22.29% of C18:0 and unsaturated fatty acids,
6.10% and 3.01% of C18:1 and C18:2, respectively. The highest composition
of methyl ester in the coconut waste oil is lauric acid and
the acid value and density were 2.3226 mg/g KOH and 0.925 g/cm3,
respectively.