Navegando por Assunto "Equations of State"

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Simulação do fracionamento em coluna em contracorrente de óleo de peixe e de solução aquosa com dióxido de carbono supercrítico
(Universidade Federal do Pará, 2015-08-11) SILVA, Marcilene Paiva da; ARAÚJO, Marilena Emmi; http://lattes.cnpq.br/8983914018546682
This work had as its general objective the simulation with Aspen Hysys fractionation process using supercritical carbon dioxide in countercurrent multistage columns of an aqueous solution of ethanol and fish oil, employing cubic equations of state with binary interaction parameters extracted from a database previously prepared with different mixing rules for the equations of state of Soave-Redlich-Kwong (SRK), Peng-Robinson (PR), their respective modified and Redlich-Kwong Aspen (RK-Aspen), from experimental data of binary systems of methyl and ethyl esters, esters of fatty acids from fish oil, biocompounds, aqueous systems and minority components of vegetable oils. Overall, no significant differences in the prediction of phase balance for all equations of state used with the mixing rules of Quadratic, Mathias-Klotz-Prausnitz (MKP) with 2 and 3 parameters, KM1 with 3 parameters and RKAspen with 2 and 4 parameters. It is worth mentioning that the mixing rule RK-Aspen with 4 binary interaction parameters, presented the smallest absolute errors for most systems. The simulator used the equation of state of Soave-Redlich-Kwong as a thermodynamic package with the mixing rules of RK-Aspen. The simulations to 140 and 145 bar pressure and 60° C for the P1 and P8 showed that increased concentration (eC20:53) and ( eC22:63) occurred at the expense of the solvent consumption (carbon dioxide), i.e. with the increase of the ratio S/F, reaching 85.67% for S/F = 200 for P1 and 70.61% for S/F = 150 to the composition P8. The simulation results of this study at 145 bar and 60° C, with relations S/F of 70, 90, 110 and 130, using different fish oil compositions, exhibited higher yield of raffinate stream compared to simulated column literature, in the Aspen Plus using Peng-Robinson equation for all the relations S / F. As the quality of recovery of the compounds of interest (eC20:53 e eC22:63), both simulations showed similar performance. For the fractionation process of aqueous solutions were performed at 101 bar pressure and temperature of 333 K. The results showed that the simulations reproduced the experiments on most operating conditions in laboratory scale, pilot and industrial published in the literature.