In this work, the deacidification of organic liquid products (OLP) obtained by
thermal catalytic cracking of palm oil at 450 C, 1.0 atmosphere, with 10% (wt.) Na2CO3
as catalyst, in multistage countercurrent absorber columns using supercritical carbon
dioxide (SC-CO2) as solvent, with Aspen HYSYS® process simulator was systematically
investigated. In a previous study, the thermodynamic database and the modeling of
equations of state necessary to simulate the deacidification of OLP were presented
[Molecules 2021, 26, 4382. https://doi.org/10.3390/molecules26144382 ]. This work
addresses a new flowsheet, consisting of 03 absorber columns, 10 expansions valves, 10
flash drums, 08 heat exchanges, 01 high pressure pump, and 02 make-up of CO2, aiming
to improve the deacidification of OLP. The simulation was performed at 333 K, 140
bar, and (S/F) = 17; 350 K, 140 bar, and (S/F) = 38; 333 K, 140 bar, and (S/F) = 25.
The simulation shows that 81.49% of OLP could be recovered and the concentrations of
hydrocarbons in the extracts of absorber-01 and absorber-02 were 96.95% and 92.78%
(wt.) in solvent-free basis, while the bottom stream of absorber-03 was enriched in
oxygenates compounds with concentrations up to 32.66% (wt.) in solvent-free basis,
showing that SC-CO2 was able to deacidify liquid organic products, obtaining fractions
with lower olefin content. The best deacidifying conditions was obtained at 333 K, 140
bar, and (S/F) = 17.
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