| Summary: | The using of n-hexane as a solvent to separate palm oil from sludge
heavy phase by liquid-liquid extraction method has been done. This research was
conducted under a variation of extraction time (5, 10 and 15 min.), volume ratio
of n-hexane : sludge (1, 2, 3 and 4) and the aging time after extraction (10, 20, 30
and 40 min.) to get an optimum oil extracted. The conductivity of the sludge
before and after extraction process was determined to show that demulsification
of sludge did not occur. The palm oil was then characterized by means chemical
and physical properties.
The results showed that the optimum of extraction time was 5 min.,
volume ratio of n-hexane : sludge was 2, aging time was 10 min., and oil
extracted was 0,18 wt.%. The conductivity of the sludge before and after the
extraction process did not significantly change was 6,4 μs/cm. The free fatty acid
content in the palm oil was 0,29% with palmitic acid as a dominant component.
The water content, peroxide value, viscosity, density and colour were 0%, 5.42
mgeq/kg, 62.10 cP, 0.911 g/mL and reddish orange. Based on SNI 01-2901-2006,
the properties of the palm oil were corresponding to the edible oil.
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