Being the bed porosity, F the mass of solid loaded in the extraction
cell, s the solid density, Q the CO2 mass flow rate, the CO2
density, Y* the solubility of the solute CO2 and Xo the global yield.
Model parameters which are adjusted according to the experimental
OEC are the intra-particle solute ratio (Xk) and the fluid
phase and solid phase mass transfer coefficients (kYA and kXA).
Eq. (7) defines the time at which the constant extraction rate
ends (tCER). The time at which the falling extraction rate period
begins (tFER) is given by:
tFER = tCER + mSI
WQ ln
Xk + Xp exp
WXo/Y∗
Xo
(