Navegando por Assunto "Process flowsheet"

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Simulação do processo de desacidificação de misturas de hidrocarbonetos, em colunas de absorção em contracorrente, usando co2 supercrítico como solvente no simulador aspen hysys
(Universidade Federal do Pará, 2022-08-11) SANTOS JUNIOR, Manoel Raimundo dos; MACHADO, Nélio Teixeira; http://lattes.cnpq.br/5698208558551065; COSTA, Elineia Castro; http://lattes.cnpq.br/9685402675283869
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.