Programa de Pós-Graduação em Engenharia Química - PPGEQ/ITEC
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2308
O Programa de Pós-Graduação em Engenharia Química (PPGEQ) do Insituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA). Sendo aprovado pela CAPES / MEC em 1991, foi oficialmente iniciado em março de 1992.
Navegar
Navegando Programa de Pós-Graduação em Engenharia Química - PPGEQ/ITEC por Orientadores "ARAÚJO, Marilena Emmi"
Agora exibindo 1 - 5 de 5
- Resultados por página
- Opções de Ordenação
Item Acesso aberto (Open Access) Determinação de parâmetros de transferência de massa do processo de extração supercrítica(Universidade Federal do Pará, 2013-03-01) SANTANA, Ádina Lima de; MACHADO, Nélio Teixeira; http://lattes.cnpq.br/5698208558551065; ARAÚJO, Marilena Emmi; http://lattes.cnpq.br/8983914018546682Supercritical fluid extraction of liquid and solid materials sparked interest for industrial applications in recent decades, particularly under the concept of green chemistry and biorefineries, so it is essential to make a modeling of this process in order to optimize and simulate operating conditions process. The objective of this work consists in determining the parameters of mass transfer of supercritical extraction of solid matrix by employing carbon dioxide as solvent, from kinetic data extraction and five systematic evaluation of mathematical models to describe the kinetics extraction of oils from the peel and pulp of buriti, oil from açaí and oleoresin from turmeric, measured in Supercritical Extraction Laboratory, Faculty of Chemical Engineering (UFPA) in order to contribute to the study of scale-up and production cost analysis. Were evaluated the models of Tan and Liou, Goto et al. (1993), Martinez et al. (2003), Esquível et al. (1999), and Sovová (1994). The extraction kinetics modeling was performed using computer applicatives developed and validated in this work from different experimental data published in the literature. Facing 40 kinetic measurements with different extraction equipment, bed settings, types of raw materials, preparation of materials, pressure and temperature and other process parameters (especially income and global flow solvent), was built an overview of results ability of the models on the mass transfer in more different curves describing the overall extraction. Generally, the model Goto et al. (1993) and Sovová (1994) showed the best predictions to experimental data of raw materials treated in this work with smaller values of chi-square, relative errors, range and standard error and R2 values close to unity.Item Acesso aberto (Open Access) Modelagem e simulação de processos de separação a altas pressões: aplicações com Aspen hysys(Universidade Federal do Pará, 2014) CUNHA, Vânia Maria Borges; MACHADO, Nélio Teixeira de; http://lattes.cnpq.br/5698208558551065; ARAÚJO, Marilena Emmi; http://lattes.cnpq.br/8983914018546682The purpose of this work was to elaborate a database of binary interaction parameters of different mixing rules, for the Soave-Redlich-Kwong (SRK) and Peng-Robinson (PR) equations of state, using experimental data of binary and multicomponent systems of hydrocarbons, N2, CO2, water, β-carotene, ethanol, acetone and methanol, in order to apply in simulations with the Aspen Hysys fractionation processes, of natural gas into a simplified turbo-expansion process; fractionation of oil, gas and water, in three-phase separator, supercritical CO2 extraction of acetone from an aqueous solution and β-carotene from an aqueous solution in multistage countercurrent column. In general, there were no significant differences, to both equations, in the phase equilibrium prediction of the binary systems studied, between the quadratic and Mathias-Klotz-Prausnitz (MKP) mixing rules with two and three parameters. It is worth mentioning that the MKP mixing rule with 3 binary interaction parameters presented the smallest absolute errors for hydrocarbon binary systems and CO2/hydrocarbons systems. For the settings of hydrocarbons phase equilibrium multicomponent systems data, the SRK equation combined with quadratic mixture rule with 2 binary interaction parameters, was presented the lowest average errors for ternary systems and for system with 5 components in both phases. In the case study of three-phase separator the SRK equation with the mixing rule RK-Aspen was the one that presented the greater separation of the aqueous phase of all simulations (285.68 kg/h) against 256.88 kg/h to the SRK equation, 249.81 kg/h for the PR equation and 152.90 kg/h to PRSV equation, confirming the great influence of the use the binary interaction parameters matrix determined in this work, with emphasis on the parameters that represent the interactions between the hydrocarbons with water. The results of the simulations with the simplified plant turboexpansion are according to the analysis described in the literature showing the following recovery rates of ethane: 84.045% to PRSV, 84.042% for SRK, 84.039% for TST and PR and 83.98% for RK-Aspen. The final product of the simulation published in the literature for the fractionation of an aqueous solution of acetone by using supercritical CO2 extraction process consisted in the output current from the bottom of the distillation column at 65 atm (6586 kPa), with a composition of 67.67% CO2 (74.3 kg/h), 31.11% of acetone (34.15 kg/h) and 1.21% (1.33 kg/h) of water in mass base. In the simulation with Aspen Hysys the output current of the distillation column was subjected to a set of flash separators for separation of CO2 reaching the recovery of 27 kg/h of acetone in three currents (11.14 and 15) with less than 5 kg/h CO2 waste and 0.8 kg/h of water. The fractionation of aqueous solution of β- carotene was simulated with the Aspen Hysys, with a multistage countercurrent column and a vertical flash separator for separation of CO2. The simulations have converged with a minimum of five stages. It was retrieved from an underflow (product) flash separator with 97.83% of β-carotene against 89.95% by mass for the simulation of an extractor of a single stage published in the literature.Item Acesso aberto (Open Access) Modelagem e simulação de sistemas multicomponentes a altas pressões aplicada a separação de compostos bioativos(Universidade Federal do Pará, 2014-04-30) SILVA, Welisson de Araújo; ARAÚJO, Marilena Emmi; http://lattes.cnpq.br/8983914018546682Large applications using supercritical fluids related to the fractionation of natural products have been studied in recent decades. This work had as objective the thermodynamic modeling of phase equilibrium of binary and multicomponent systems of vegetable oils related compounds (fatty acids, triglycerides, squalene, α-tocopherol and methyl and ethyl esters of fatty acids) with supercritical carbon dioxide, using the cubic equations of state of Soave-Redich-Kwong (SRK) and Peng-Robinson (PR), with the Quadratic and Mathias-Klotz-Prausnitz mixing rules, to build a database of binary interaction parameters between these constituents and between these constituents with carbon dioxide, with an emphasis on the interactions related to bioactive compounds. The equations of PR and SRK showed efficiency in correlation of binary systems equilibrium data. For most binary systems experimental data fit, with the mixing rules with two binary interaction parameters, obtained good results and cash equivalents when compared with the mixing rules with three parameters. For multicomponent systems, when the experimental data were correlated with the PE program, employing both equations with quadratic mixing rule, shown convergence, best results for phase equilibrium description and the representativeness of the thermodynamic analysis of separation through the distribution coefficients were obtained. For the CO2 (1)/(2) oleic acid/linoleic acid (3) system, the prediction of equilibrium with an interaction parameters matrix of binary systems proved equivalent in relation to the use of multicomponent systems interaction parameters. In relation to the CO2 (1)/Methyl Myristate (2)/Methyl Palmitate (3) system the results obtained from the calculation using the interaction parameters matrix of binary systems, as with the parameters of interaction of multicomponent system, showed average deviation similar to the temperature of 323.15 K. For the CO2 (1)/Squalene (2)/(3)/Triolein oleic acid (4) system, the best results were obtained by the Quadratic mixing rule with the multi-component system interaction parameters. In relation to the CO2 (1)/(2) oleic acid/Palmitic acid (3)/Squalene (4) system, the results obtained using the interaction parameters matrix of binary systems showed average deviations below 8%. The calculation of the ELV for the CO2 (1)/Methyl Myristate (2)/Methyl Palmitate (3)/Methyl Oleate (4)/Methyl Stearate (5) system, with the EDEflash and PE program with Quadratic mixture rule, using the interaction parameters matrix from binary systems showed similar results. For the CO2 (1)/Ethyl Palmitate (2)/ Ethyl Stearate(3)/ Ethyl Oleate (4)/ Ethyl Linoleate (5) (palm oil ethyl esters) system, the prediction of the ELV with the SRK combined with Quadratic mixing rule, using the interaction parameters matrix from binary systems, presented results with deviations below 4% in both phases at 333.15 K.Item Acesso aberto (Open Access) Simulação da separação e purificação do biodiesel de óleo de palma com CO2 supercrítico(Universidade Federal do Pará, 2016-07-11) GONÇALVES, Aline Lobato; ARAÚJO, Marilena Emmi; http://lattes.cnpq.br/8983914018546682Biodiesel has attracted growing attention worldwide in recent years. The production of biodiesel from biomass involves separation and purification steps. The method generally used, the aqueous washing, has major disadvantages such as the generation of wastewater and forming emulsions. The objective of present work is to investigate the biodiesel purification using carbon dioxide, which in supercritical conditions has properties capable of separating glycerol phase of esterified phase (biodiesel), providing higher quality products and less waste. In this study, two simulations were used for analysis and investigation of purification of crude palm oil biodiesel. Both configurations conventionally designed the project process via ethylic route by basic catalysis to the reaction step. The "case 1" used a fractional distillation column for separating excess ethanol and a liquid-liquid column extraction using water as solvent for the separation of glycerol. The "case 2" applied a fractionating column in countercurrent, used for the glycerol separation step, carbon dioxide as supercritical solvent and for separating excess of ethanol, a flash vessel in the final purification of biodiesel. The simulator employed was Aspen HYSYS V8.4 that used binary parameters, adjusted with the equations of state of Soave-Redlich-Kwong (SRK) and Redlich-Kwong-Aspen (RK-ASPEN) to study systems, performed the simulations appropriately. The supercritical CO2 proved to be efficient in the separation of glycerol, given that biodiesel produced with this purification technology met the ANP main standards rules.Item Acesso aberto (Open Access) 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/8983914018546682This 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 (eC20:53) and ( eC22:63) 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 (eC20:53 e eC22:63), 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.