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.

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Agora exibindo 1 - 11 de 11

Acesso aberto (Open Access)
Craqueamento termocatalítico do óleo de buriti (Mauritia flexuosa L.), óleo de palma (Elaeis guineensis) e sabões do óleo de buriti (Mauritia flexuosa L)
(Universidade Federal do Pará, 2011-06-30) SILVA, Marcilene Silva da; MACHADO, Nelio Teixeira; http://lattes.cnpq.br/5698208558551065; BORGES, Luiz Eduardo Pizarro; http://lattes.cnpq.br/8756886156388456
The present work aims to investigate the Thermocatalytic Cracking Process of the Buriti Oil ( L.), Palm Oil (Elaeis guineensis) and burit oil soap, considering the transformation of vegetable oils and soaps using the thermocatalytic cracking in biofuels, using Na2CO3 (Sodium Carbonate), CaCO3 (Calcium Carbonate), CaO (Calcium Oxide) and Acidic Zeolites (HZSM-5) as catalysts and temperatures of 420, 450 and 480 ° C. The fruit of Buriti (Mauritia flexuosa L) was collected and extracted from the pulp oil, and then this oil was characterized in relation to the Acidity Index, Saponification Number, Viscosity, Density, Refractive Index and CHN analysis. In preliminary tests it was used the refined and neutralized palm oil, so they were not characterized. Buriti soap was prepared in the laboratory with potassium hydroxide and sodium hydroxide and stored for thermal pyrolysis. The catalysts were also characterized in relation to Infrared, Nuclear Magnetic Resonance of 29Si and 27Al, XRay Diffraction, thermal analysis, chemical analysis and TPD of ammonia. In the process of thermocatalytic cracking the liquid products produced were analyzed regarding the parameters: yield, acidity index, infrared spectrum, NMR and CHN analysis and then were characterized in relation to density and kinematic viscosity. However, regarding the level of acidity of the liquid products, only basic catalysts produced cracked with acceptable values for use as fuel. From the results it was verified the efficiency of catalysts in which the sodium carbonate catalyst gave products with low acidity and good characteristics for use as fuel.
Acesso aberto (Open Access)
Estudo das alterações petrofísicas e mineralógicas em amostras de calcita e dolomita decorrentes da interação com água carbonatada e CO2 supercrítico
(Universidade Federal do Pará, 2023-05-29) SOUZA, Felipe Pereira de; LUCAS, Cláudio Regis dos Santos; http://lattes.cnpq.br/1695226159975283; HTTPS://ORCID.ORG/0000-0001-5443-462X; AUM, Pedro Tupã Pandava; http://lattes.cnpq.br/7515419219571335; https://orcid.org/0000-0002-2339-9865
CO2 capture, utilization, and storage techniques, known by the acronym CCUS (Carbon capture, utilization, and storage), have been studied as primary tools for achieving the decarbonization targets, stipulated to slow down the rise in temperature earth average. In this context, geological storage consists of injecting CO2 into the rock formation, so that it is trapped in saline aquifers, coal deposits or oil reservoirs. CO2 injection is already carried out, for example, in the Brazilian pre-salt fields, where the oil produced has a high concentration of CO2 in its composition. It is expected that other geological structures can be used for geological carbon storage. However, the geological sites must be carefully selected, one of the key points being the geochemical stability due to the contact of CO2 with the rock formation. Thus, this project aimed to study the process of interaction of CO2 with formations of carbonate rocks, to increase the fundamental knowledge regarding the processes of rock-fluid interaction in the geological storage of CO2. The methodology included the analysis of the petrophysical properties of commercial carbonate rocks (Indiana Limestone and Silurian Dolomite) and of the dolomitic carbonate sample from the Itaituba Formation, before and after exposure to CO2 in the form of carbonated water and in the supercritical form. We also used X-ray microtomography to study the porous structure of samples at different scales. The results showed that the Indiana rock samples present distributed porosity, being essentially formed by structures predominantly composed of pallets, skeletal grains, ooids and shell fragments. The samples of Silurian Dolomite presented a structure formed by less pores, however larger and more concentrated. The rock samples from the Itaituba formation showed very low porosity and permeability. The petrophysical properties evolved after contact with CO2. Rock-fluid interaction studies will show changes in rock matrices resulting from the dissolution/or expansion process. The microtomography technique of x-ray was used in the imaging of the samples to visualize the change in the morphology of the rocks, the technique allowed the comparison of before and after CO2 attack. The DRX and FRX analyzes showed positive results regarding the mineral composition of the samples used. The results of this work will contribute to the reduction of uncertainties related to the processes and mechanisms of the geological storage of CO2.
Acesso aberto (Open Access)
Interações de Quantum Dot com estruturas externas de vírus Nipah utilizando docking e dinâmica molecular
(Universidade Federal do Pará, 2023-01-30) ALMEIDA, Aguinaldo Pantoja de; OLIVEIRA, Mozaniel Santana de; http://lattes.cnpq.br/0810227136654245; HTTPS://ORCID.ORG/0000-0002-4076-2443; CHAVES NETO, Antônio Maia de Jesus; http://lattes.cnpq.br/3507474637884699; https://orcid.org/0000-0002-9730-3512
Performing the interaction of the outermost protein of the Nipah virus with fourteen structures with possible potential for the emission of quantum dots, using anchoring and molecular dynamics, using molecular docking platforms: CB Docking, Swiss DOCK, AutoDock Vina 4.2.6 to perform a comparison of results explaining the best values, in addition to using Gromacs 2022 to make ligand trajectories in relation to time. The mostly hydrophobic complexes at the receptor binding site. The tolerance energy results tolerated the partial loads of the tips which showed better stability, the RMSD results also respected this premise. Thus, the set formed by combining proteins with a quantum dot has the potential to more efficiently adsorbing of the protein components of the virus. Molecular dynamics and docking studies and verification of binding energy revealed strong and stable binding between para QD K and QD-G and QD-F with the macrostructure of NIPAH virus. It was established in the docking studies, that the binders have emission energy scores of -13,658 kcal/mol, -13.6 kcal/mol, -13.9 kcal/mol, for K, G and F respectively. The same result was applied in the Gibbs free energy verification study with values for F of 239.00 kcal/mol, G of 246.65 kcal/mol and K of 259.52 kcal/mol.
Acesso aberto (Open Access)
Modelagem, simulação e estimação dos parâmetros por MCMC de um modelo que descreve a dinâmica de adsorção em uma coluna de leito fixo
(Universidade Federal do Pará, 2023-01-18) SOEIRO, Wilhamis Fonseca; VIEGAS, Bruno Marques; http://lattes.cnpq.br/1196600058247902; HTTPS://ORCID.ORG/0000-0002-2768-652X; ESTUMANO, Diego Cardoso; http://lattes.cnpq.br/5521162828533153; https://orcid.org/0000-0003-4318-4455
The treatment of industrial effluents is extremely important for both the environment and human health. The purification of water from polluting components, such as metals and organic compounds, for reuse in the industrial process can be considered one of the main applications in this field. Therefore, there is interest in modeling one of the most used treatment processes, adsorption. Aiming to describe the dynamics of the process in an adsorption column, in this work the method of lines and the pdepe function (matlab) are used to solve the model formed by the mass balance in the liquid phase, linear driving force equation (LDF) and the Langmuir isotherm for equilibrium. An evaluation of the model varying some experiment conditions was carried out, from which results congruent with those found in the literature were observed. In addition, a sensitivity analysis of the phenomenon was carried out in relation to the parameters: Langmuir constant, intraparticle mass transfer coefficient and axial dispersion coefficient. Subsequently, these parameters were estimated using the Monte Carlo technique via Markov chain (MCMC) using experimental data found in the literature. Finally, in general, the estimates were good enough to represent the adsorption dynamics of the evaluated experiments.
Acesso aberto (Open Access)
Produção de batons a partir das oleaginosas amazônicas: açaí, andiroba, castanha-do-brasil, copaíba e tucumã
(Universidade Federal do Pará, 2023-02-28) OLIVEIRA, Jenniffer Rayane Alves de; BRASIL, Davi do Socorro Barros; http://lattes.cnpq.br/0931007460545219; https://orcid.org/0000-0002-1461-7306
Several researches are being carried out for the elaboration of cosmetic products using Amazonian raw materials, due to their innumerable properties. Açaí oil (Euterpe Oleracea) extracted from the pulp of its fruits has a high content of antioxidant compounds. From the seeds of the andiroba tree (Carapa guianensis Aubl.) an oil with medicinal properties was extracted. The oil extracted from the almonds of the Brazil nut (Bertholletia excelsa) contains a high content of lipids, vitamins and minerals. From the tucumã almonds (Astrocaryum aculeatum) a butter is extracted, which has great potential for cosmetic and pharmaceutical use. Copaiba essential oil, extracted from the resin of the species (Copaifera Officinalis) has an exotic aroma and therapeutic properties. Thus, the objective of this study is the manufacture of lipsticks based on Amazonian ingredients mentioned above, in addition to other constituents present in their formulation. The oilseeds underwent physical-chemical analysis, proving their good quality for cosmetic application. The GC-MS result of the same identified their main fatty acids, signaling what would be the main applicability for each of the species. Tests of antioxidant activity by scavenging the ABTS free radical and of toxicity and in vitro cell recovery of oilseeds helped to measure their antioxidant and anti-inflammatory properties. The lipsticks produced from oilseeds underwent quality control tests, presenting compliant results for microbiology, spreadability, pH, colorimetry and melting point. Proving not only the feasibility of producing the cosmetic, but also its properties.
Acesso aberto (Open Access)
Produção de biodiesel através da hidroesterificação do óleo de andiroba (Carapa guianensis, Aubl.) via Catalise Heterogenea Acida
(Universidade Federal do Pará, 2011-06-30) TEIXEIRA, Evilácio Luz; SOUZA, Mariana de Mattos Vieira Mello; http://lattes.cnpq.br/8882084525542926; FRANÇA, Luiz Ferreira de; http://lattes.cnpq.br/6545345391702172
The process of hidroesterification (hydrolysis followed by esterification) is constituted as an alternative to the conventional process for producing biodiesel, because it allows the use of raw materials of any content of fatty acids and moisture. Biodiesel is derived from the esterification of Andiroba oil with high content of fatty acids being used niobium oxide powder (HY-340) from Brazilian Company of Metallurgy and Mining - CBMM – as a catalyst. For the execution of experiments was used an autoclave reactor (batch). The hydrolysis reaction was conducted at 300oC, 1200 psi and molar ratio water/oil equal 20. In the esterification reactions were observed the effects of molar ratio methanol/fatty acid (1,2; 2,1 an 3,0), temperature (150, 175 and 200oC) and the concentration of catalyst (0, 10 and 20%) on conversion and initial rate of reaction. The data were conducted according to experimental design (factorial with 23 and adding 3 plants points) analyzed by the program Statistica. The conversion of esterification reaction was monitored from measurements of titrimetric acidity of aliquots removed at times of 5, 10, 15, 20, 25, 30, 45 and 60 minutes. In the experiments of esterification the highest conversion obtained was 96.1% with temperature of 200 o C, 20% m / m of catalyst and molar ratio methanol / acid equal to 3.0. Eliminating the catalyst and recital the same levels for the other two analyzed variables (temperature and molar ratio), was obtained a conversion of 95.3%, however was observed a conversion rate child, taking-if an increase of 35 minutes in the time of compared with the reaction catalyzed reaction.
Acesso aberto (Open Access)
Reciclagem de resíduo a partir de cinzas de carvão mineral: produção de argamassas
(Universidade Federal do Pará, 2001-07-06) SIQUEIRA, Jacilene Siqueira de; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968; SOUZA, Célio Augusto Gomes de; http://lattes.cnpq.br/0800747860976046
This work aims to evaluate the possibility of use of waste obtained from the combustion of coal in fluidized bed boilers, an alumina refinery in Pará state. In this context, we evaluated the incorporation of fly ash as pozzolan, to partially replace cement in mortar production. To that end, samples were prepared using Portland cement type CPII-E-32. The mixtures were in the ratio 4:1, that is 4 parts aggregate (silica) and 1 part of binder (cement and ash), with the inclusion of the ash of 10, 20, 30, 40 and 50 percentage with respect to the cement, beyond the mortar without addition. We defined two relation water / binder, 0,4 and 0,8. After 7 and 28 days curing time, were tested for compressive strength analysis of behavior. In addition, the mortar with the water / binder 0.8 were subjected to further analysis of X-ray diffraction, scanning electron microscopy, water absorption, porosity and bulk density, the results obtained were consistent when compared with literature data, showing that viable application of ash studied in the construction industry.
Acesso aberto (Open Access)
Recobrimento de pimenta-do-reino (piper nigrum l.), em leito de jorro, com suspensão polimérica de amido de mandioca, plasticizada com etanol
(Universidade Federal do Pará, 2024-12-13) QUEIROZ, Nian Iury Ferrão; REGO, José de Arimatéia Rodrigues do; http://lattes.cnpq.br/4163468898377462; HTTPS://ORCID.ORG/0000-0003-0891-6438; BRASIL, Davi do Socorro Barros; http://lattes.cnpq.br/0931007460545219; https://orcid.org/0000-0002-1461-7306
This study aimed to evaluate the black pepper coating technique using a fluidized bed, focusing on its applicability in the food industry. The research explored the optimization of operational parameters, such as suspension flow rate, temperature, and blower flow rate, using the response surface methodology within a Box-Behnken design. The goal was to improve the efficiency of the coating process, ensuring uniform distribution of the coating over the black pepper grains. This study investigated the fluid dynamic and physicochemical behavior of black pepper seeds coated with a cassava starch-based biofilm, applying the spouted bed process. The seeds were classified in group D of the Geldart classification, indicating good fluidization potential and excellent flowability, facilitating the coating process. The sphericity of the seeds (0,98) and their density (1,45 g/cm³) directly influenced their behavior in the bed, allowing minimal fluidization at a velocity of 38,32 cm/s and a pressure drop of 7,13 cmH2O. The molecular interaction between the starch and ethanol generated biofilms with flexibility and mechanical strength. However, ethanol's volatility requires control during the drying process to maintain the biofilm's quality. The spouted bed process proved efficient for coating application, and the desirability function analysis indicated that the established criteria were satisfactorily met. The results confirm the technical feasibility of applying biopolymer coatings to black pepper seeds, contributing to the development of biodegradable alternatives aligned with environmental demands
Acesso aberto (Open Access)
Simulação do escoamento EMHD de um fluido micropolar em um duto quadrado utilizando a técnica da transformada integral generalizada
(Universidade Federal do Pará, 2023-04-28) SOUZA, Andreo Carlos Magalhães; MIYAGAWA, Helder Kiyoshi; http://lattes.cnpq.br/5848592858919971; HTTPS://ORCID.ORG/0000-0001-9346-4696; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785; https://orcid.org/0000-0001-9365-7498
This paper aims to perform the kinetic, microrotational and thermal analyses of an electromagnetohydrodynamic (EMHD) flow of a micropolar fluid within a quadratic section duct subjected to an external magnetic field, where the mathematical formulation takes into account a pulsatile pressure difference. The flow is transient, two-dimensional in laminar regime and has constant physical properties. The resulting nonlinear differential equations (Navier-Stokes Equation, Microrotation Equation and Energy Equation) were solved using the hybrid (analytic-numerical) GITT (Generalized Integral Transform Technique) technique and a computer code was synthesized in Wolfram Mathematica v. 11.3 software with the objective of numerically solving the proposed model. Aiming to analyze the consistency of the technique, the convergence analysis of the variables central velocity, central microrotation, central temperature, average velocity, average temperature, wall stress and Nusselt number was initially performed. Next, the numerical verification of the method is presented by comparing the results of GITT with that of the NDSolve routine of the software used. The analysis of the parameters involved in the flow (Strouhal number, Hartmann number, Prandtl number, Eckert number, electrical parameter, micropolarity parameter, mean pressure gradient, microrotation viscosity and pressure pulse frequency) and the physical interpretation of the variation of each of them is also performed.
Acesso aberto (Open Access)
Simulação numérica da acidificação de carbonatos utilizando malhas obtidas a partir de imagens de MICRO-CT
(Universidade Federal do Pará, 2024-05-21) SANTANA, Beatriz dos Santos; VICENTE, Bruno José; http://lattes.cnpq.br/4190693236960837; AUM, Pedro Tupã Pandava; http://lattes.cnpq.br/7515419219571335
Matrix acidizing is one of the well stimulation techniques that consists of pumping an acid solution at a pressure lower than the fracture pressure of the rock. In carbonate formations, as a result of the acid-calcite reaction, part of the rock is dissolved and high conductivity channels, called wormholes, are created. One of the major challenges associated with simulating this type of process is to incorporate the heterogeneities inherent in carbonate rocks into the numerical meshes. The main objective of this work is to simulate acidification in carbonate rock plugs using the initial porosity field obtained from a microCT image. Two-scale modeling was used, with the balance of the amount of movement carried out using the Navier-Stokes-Brinkman approach. The simulations were carried out in a code developed in openFOAM, varying the speed of the acid on the face and obtaining the PVbt (Pore Volume to Breakthrough) for each condition. Mesh convergence analyses and the impact of varying the inlet interstitial velocity were carried out. Simulation results were compared with initial porosity fields generated using the uniform, normal and lognormal distributions. The initial porosity and permeability distributions obtained were consistent with the microCT image. Variations in the number of cells had no significant impact on the PVbt. By varying the injection speed on the face, it was possible to obtain the uniform, conical, branched, dominant wormhole, dissolution on the face and compact dissolution patterns, obtaining the PVbt curve to determine the optimum point (lowest PVbt). For the model developed from the image, the lowest PVbt obtained was 0.262 with an input speed of 4 2,12 10 m/s −  . For the models with uniform, normal and lognormal porosity distributions, the lowest PVbt values obtained were 0.276, 0.261 and 0.309 at an input speed of 5 8,3 10 m/s −  . The results presented showed that the methodology used to obtain porosity fields from microCT images can be used to obtain results that are more representative in terms of accounting for rock heterogeneities.
Acesso aberto (Open Access)
Uso do óleo de açaí (Euterpe oleracea) e amido de mandioca (Manihot esculenta) na obtenção de produtos bioativos
(Universidade Federal do Pará, 2023-10-30) OLIVEIRA, Sara Caroline Pacheco de; LAGO, Gleice Vasconcelos Pereira do; http://lattes.cnpq.br/7932392876332323; HTTPS://ORCID.ORG/0000-0002-9702-250X; BRASIL, Davi do Socorro Barros; http://lattes.cnpq.br/0931007460545219; https://orcid.org/0000-0002-1461-7306
Cassava is found in abundance in nature, especially in the State of Pará, from them it is possible to extract starch, rich in amylose and amylopectin, components that help in the production of bioplastics. Furthermore, Pará is the largest producer of açaí, a raw material that is also natural and has antioxidant, phenolic and healing compounds. The oil extracted from açaí has the same characteristics found in the pulp, which makes it an excellent agent for incorporation into products added on polymers. The present study reports the characterization of cassava starch and evaluation of the biological characteristics of açaí oil, for the production of an active bioplastic, with the aim of incorporating the benefits found in the oil. To this end, some tests were carried out using plasticizers such as glycerol, ethylene glycol and sorbitol in the composition, to structure the bioplastic, where glycerol proved to be the most viable option. Cassava starch was dried at three temperatures: 45, 60 and 75°C, for the drying curve, and it wasobserved that starch dried at 45°C had better performance, without significant losses in its structure. The analyzes carried out were relevant to detect the potential of açaí oil on incorporating bioplastic. It is known that the characterization of the oil is essential to ensure its quality. Açaí oil was evaluated for 1H NMR, which was essential for quantifying iodine (67.05 I2/g) and saponification (109.06 mg KOH/g) levels. Furthermore, the oil also presented satisfactory results, with emphasis on the following activities: antioxidant (532.56 µM of Trolox/g), anticancer (with reduced metabolic activity and cell viability for the AGP01, SK19 and VERO lines, with IC50 75 .30; 80.15; 73.05 µg/ml, respectively), in addition to the promising result in anti-inflammatory activity that tested target gene TNF-α (tumor necrosis factor alpha) and detected that the samples analyzed with the oil presented anti-inflammatory effect even after 24 hours of exposure, which confirms its bioactivity. This highlights the gigantic potential of using açaí oil for improvement and application in new products, as it has proven to be a strong ally against infectious and cancerous diseases, with cell recovery capacity. Therefore, the oil was incorporated into a polymeric matrix based on cassava starch, which resulted in bioplastic with a thickness (0.157 mm), PVA (19.39 g.mm.KPa-1.d-1.m- 2), transparency (2.60), and one of the highlights was the colorimetric analysis that was able to detect shades of green in the sample, represented by values of -5.75 (a*) and 10.90 (b*), identifying the presence of chlorophyll from açaí oil. In this way, it was possible to note the relevance of using this oil for inclusion in products that bring benefits to the end consumer, in order to take advantage of the chemical and biological properties that this oil has in its composition, as is the case of bioplastic, which contributes to the pharmaceutical sector for presenting bioactivity, in addition to its possible use in the packaging sector and helping to reduce the use of plastics from petroleum, as it is a 100% biodegradable plastic.

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