where dWA/dt, mass transfer rate of the coconut waste oil (g/s); CA
and CAi, concentration of coconut waste oil in liquid (solvents) at
time t (g/m3) and at equilibrium (g/m3), respectively; k, mass transfer
coefficient, ms1; A, surface area for mass transfer process, m2.
Since the extraction was conducted in a batch process and the
volume was constant throughout the experiment, Eq. (2) can be
written as: