This study demonstrated that the mass transfer model showed
a good fit with the experimental data for the oil extraction of coconut
waste using hexane and petroleum ether with R2 above 0.99.
The rate of extraction increases by 1.9% for soxhlet extraction using
hexane when the temperature (80 C) and solvent to solid ratio
(10:1) was increased. Increasing the temperature from 70 to
80 C; increases the yield by 2.3% for soxhlet extractor. Solubility
and density data showed hexane as a better solvent if compared
with the petroleum ether with more 1.3% oil yield for soxhlet
extractor. The mass transfer coefficients also increase with solvent
to solid ratio and temperature by 0.1% and 0.2%, respectively. Thiele modulus value shows that the batch and soxhlet extraction
were not affected by the mass transfer within the particle. The
DG, DS and DH values were 10.94–13.35 kJ/mol, 33.10–39.57 J/
mol K and 0.12–1.25 kJ/mol, respectively proves that the extraction
process was spontaneous, irreversible and endothermic, respectively.
The maximum yields obtained from extraction of coconut
waste oil with particle size diameter of 0.5 mm were 23.6% at
80 C for soxhlet extractor and 21.9% at 65 C for batch extractor