Mestrado em Engenharia Química
URI Permanente para esta coleção
Nível: Mestrado Acadêmico
Ano de início: 2014
Conceito atual na CAPES: 3
Ato normativo: Homologado no Parecer CES/CNE nº 487/2018, da Câmara de Educação Superior do Conselho Nacional de Educação, e no Parecer nº 00049/2019/CONJURMEC/CGU/AGU, da Consultoria Jurídica junto ao Ministério da Educação, proferidos nos autos do Processo nº 23001.000335/2018-51. Divulgado na portaria 609 (14/03/2019) e publicada no DOU (18/03/2019- Edição 52/Seção 1/pg 63).
Periodicidade de seleção: Semestral
Área(s) de concentração: Engenharia Química
Url do curso: https://engenhariaquimica.alegre.ufes.br/pt-br/pos-graduacao/PPEQ/detalhes-do-curso?id=1077
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Navegando Mestrado em Engenharia Química por Autor "Barañano, Audrei Giménez"
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- ItemAplicação do método da integral dupla em um problema de solidificação em geometria esférica(Universidade Federal do Espírito Santo, 2021-11-04) Canzian, Estefânia Pintor; Barañano, Audrei Giménez; https://orcid.org/0000000201745202; http://lattes.cnpq.br/6155024776819193; https://orcid.org/0000-0003-4118-0119; http://lattes.cnpq.br/1773575397759900; Barbosa, Mariana Ricken; https://orcid.org/0000-0003-0802-4309; http://lattes.cnpq.br/8760861693553546; Costa, Ariany Binda Silva; https://orcid.org/0000-0001-7320-3317; http://lattes.cnpq.br/9518055204202962; Mady, Carlos Eduardo Keutenedjian; https://orcid.org/0000-0001-8097-0629; http://lattes.cnpq.br/8200282913635713; Santiago, Fabio; https://orcid.org/0000-0003-1854-1983; http://lattes.cnpq.br/9172880946351461The solution of heat transfer problems involving solidification is important in several applications in engineering, such as: growth of pure crystals, purification of several materials, more efficient thermal storage systems, development of improved methods for the solidification of metals and alloys in casting processes, among other applications. In this context, this study aims to apply the double integral method to obtain approximate solutions of spherical solidification problems and to obtain a refinement of the simple integral method solution available in the literature. Thus, both methods were applied to the differential equation that models the solidification phenomenon in spherical geometry using a linear quadratic temperature profile. Initially, the results obtained by the methods with the linear profile were compared with the solution proposed in the literature, and, in all cases analyzed, the double integral method obtained superiority over the simple integral method for the calculating of the solidification time. When comparing the results obtained from the integral methods with numerical data available in the literature, the double integral method with quadratic profile provided superior results compared to the simple integral method with the quadratic profile available in the literature. Furthermore, the double integral method using the quadratic profile presented better performance for the calculation of the solidification time in all analyzed cases, when evaluated with the experimental data present in the literature. Showing that this method is able to provide a better approach to the solution of the physical problem under study.
- ItemEstudo da adição de lítio a nanocatalisadores de óxido de cálcio para a produção de biodiesel(Universidade Federal do Espírito Santo, 2018-02-27) Soares, Thaís Machado; Pinheiro, Christiano Jorge Gomes; Barañano, Audrei Giménez; Guimarães, Damaris; Brito, Gilberto Augusto de OliveiraIn view of the environmental impacts caused by primary energy sources, federal agencies around the world are increasingly seeking to institute research aimed at new sources of energy from renewable natural resources. In this regard, we highlight biodiesel, created to replace diesel oil derived from petroleum. Industrially, the production of this biofuel is catalyzed by homogeneous catalysts, which end up giving certain limitations to the process. Thus, heterogeneous catalysis is an alternative that has been evaluated, being that calcium oxide (CaO) is one of the solid catalysts that has been highlighting, due to its high activity and low cost. However, CaO has presented leaching problems. In this context, the objective of this study was to present a diagnosis related to the addition of lithium in calcium oxide nanocatalysts, synthesized by the wet impregnation method and thermal decomposition, in order to evaluate which technical is more efficient to obtain a material with a greater stability and selectivity to serve as a heterogeneous catalyst in transesterification reactions of soybean oil via the methyl route. Using thermogravimetric (TGA), X - ray diffraction (XRD), spectroscopy (FTIR) and microscopy (SEM) and (TEM) techniques, for verification to the format and the elements present as well as the mean crystallite and the network parameters of the nanocatalysts. By means of the spectroscopy technique (1H NMR), it was possible to verify that the addition of lithium in the CaO nanocatalyst increased catalytic activity and selectivity in biodiesel. In addition, the techniques used for the synthesis of the nanoparticles provided greater stability to the material. For, the conversion of products into biodiesel was higher than 87% in the third reaction cycle.
- ItemObtenção de ésteres metílicos utilizando dolomita como catalisador heterogêneo na reação de transesterificação(Universidade Federal do Espírito Santo, 2017-02-14) Chiba, Marlene Leiko; Barañano, Audrei Giménez; Pinheiro, Iara Rebouças; Guimarães, DamarisClimate change and environmental awareness of society have favored research into environmentally sustainable products and processes. Biodiesel is a fuel derived from renewable sources, such as vegetable oils and animal fats, which can partially or completely replace petroleum diesel. Conventionally, biodiesel is produced by homogeneous alkaline transesterification reaction, but studies have been carried out for the use of heterogeneous catalysts, which have advantages such as the reduction of effluent residues and the possibility of reuse of the catalyst. Dolomite is a limestone, an abundant material in nature and low cost, with industrial application in several areas. Recently, dolomite has been studied for use as a heterogeneous catalyst in biodiesel production. In the present study, a dolomite from a region of Cachoeiro de Itapemirim - ES was investigated for use as a heterogeneous catalyst in biodiesel production. The calcination of this dolomite at 900 °C for 2 hours resulted in materials with important characteristics, which were investigated by chemical analysis, XRD, TGA / DTG and SEM. These qualities ensured good catalysis of the reaction of transesterification of cottonseed oil with methanol in amount of 2% or 3% by weight of catalyst. It was also possible to reuse them for two more cycles. From the reactions resulted products with high concentrations of methyl esters of approximately 98% FAME, with methyl linoleate and methyl palmitate being the most expressive esters, and it was not necessary to use water in the purifications and other process steps.
- ItemProdução de biodiesel de óleo de algodão utilizando catalisador heterogêneo sintetizado a partir da casca de ovo(Universidade Federal do Espírito Santo, 2017-02-20) Castro, Luciene da Silva; Barañano, Audrei Giménez; Pinheiro, Christiano Jorge Gomes; Guimarães, DamarisThe search for alternative sources to fossil fuels due to dwindling oil reserves, increasing energy demand and reducing the environmental impact, emerged biodiesel, a biofuel with low toxicity and biodegradable. The synthesis of biodiesel is usually carried out using the transesterification method, which can use both homogeneous catalysts and heterogeneous catalysts to accelerate the reaction. Although the homogeneous catalysis is more used by the industries, it is necessary to perform several washes of the product and there is no recovery of the catalysts. Thus, the use of heterogeneous catalysts can overcome these difficulties, but it has a higher cost. In this paper sought to synthesize the CaO catalyst derived eggshell prepared at different temperatures of calcination for the production of cotton oil biodiesel. The catalysts were prepared from calcination and characterized by the Hammett method, X - ray diffraction (XRD), Thermogravimetry (TG) and Scanning Electron Microscopy (SEM). The catalytic activity was evaluated by the methyl transesterification reaction in triplicate for 3 h, using a 9: 1 molar ratio of methanol: oil, 3% catalyst (mass of catalyst/ oil) at 60 °C. The eggshell is rich in CaCO3, when subjected to heat treatment results in CaO, confirmed by the X - ray Diffraction. The high basicity of the catalysts was demonstrated by the Hammett method. The catalysts had a base strength of 9,8 = H_ < 12,2 and while the in nature shell eggshell had H_= 3.5. The calcination temperature exerted a strong influence on the heat treatment. The eggshell morphology was thermally modified. The catalysts exhibited good thermal stability. The transesterification reaction of the catalysts calcined at 800 °C, at 900 °C and at 1000 °C achieved an ester conversion of 97.83% and 97.23% and 98.08% respectively. Catalysts are promising for the production of biodiesel.
- ItemUtilização de resíduo de rochas ornamentais para produção de cerâmica de revestimento(Universidade Federal do Espírito Santo, 2017-02-21) Oliveira, Gabrielly Sandrine de; Borges, Simone Pereira Taguchi; Borges Junior, Luiz Antônio; Barañano, Audrei Giménez; Guimarães, DamarisBrazil is among the main producers of natural stones. The extraction and processing of granites and marbles generates an enormous quantity of fine waste, from their extraction to the polishing. In this work, the dimension stones waste of diamond multi-wire machine was used in the engobe and glaze for application as a coating ceramic, because it has similar composition and granulometry to clay (basic constituent of these ceramics). After chemical characterization of the dimension stones waste and clay, some additives (fluxes, dyes and stabilizers) were mixed with the waste, and the engobe and enamels were prepared in different proportions. These compositions were tested to coating the ceramics with 30 mm X 30 mm X 5 mm, in the single firing and double firing processing, aiming to obtain more uniform surface and better technological properties. The single firing presented better surface results, being thus reproduced in the base ceramics with 100 mm x 100 mm x 5 mm. These ceramics were analyzed for relative density, shrinkage, water absorption, chemical attack resistance, and abrasion resistance, in according to NBR ABNT 13818 standard. The ceramics after sintering showed some cracks and relative density of approximately 77.8%. The double firing ceramics presented 5.14 ± 0.44% of linear retraction, and the single firing ceramics presented 4.35 ± 0.44%, values close to the literature. The samples were classified as “Class A” for the chemical attack tests, considered as excellent resistance. It can be concluded with wear test that the ceramic coating produced is indicated for residences or areas where it is usually walked with slippers or bare feet, and this ceramic is classified as PEI 1.