Engenharia Química
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Programa de Pós-Graduação em Engenharia Química
Centro: CCAE
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URL do programa: http://www.engenhariaquimica.alegre.ufes.br/pos-graduacao/PPEQ
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Navegando Engenharia Química por Autor "Baranano, Audrei Gimenez"
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- ItemInfluência do uso do fíler de calcário, alumina desativada e escória de alto forno nas propriedades físicas e químicas dos cimentos CPI e CPV ARI RS(Universidade Federal do Espírito Santo, 2020-12-21) Silva, Gilson Vicente da; Baranano, Audrei Gimenez; https://orcid.org/0000000201745202; http://lattes.cnpq.br/6155024776819193; https://orcid.org/0000000261796378; http://lattes.cnpq.br/8304767944187721 ; Oliveira, Michel Picanço; https://orcid.org/0000000192410194; http://lattes.cnpq.br/6383844066460475; Borges, Simone Pereira Taguchi ; https://orcid.org/0000-0002-7192-0950; http://lattes.cnpq.br/8221926915555893In the last decades, the growth of Portland cement production has intensified, given the growth of civil construction. However, the activities of the cement industries are extremely polluting and contribute a large share of CO2 emissions, about 5 to 7% values are due to this activity in the world. With the worldwide focus on increasing additions in Portland cements and under the vision of developing a more sustainable product, research on the topic is necessary. Facing this challenge, different mortars were produced in the laboratory, with a mixture taken as a reference and twenty samples replacing clinker with limestone filler, deactivating alumina and blast furnace slag in proportions up to 50%. The influence of the additions on the chemical characteristics was verified through the standardized tests (sulfur trioxide, insoluble residue, loss on fire, magnesium oxide) and in the physical tests (residue on the 75 micron sieve, hot expansion, paste consistency, beginning and end of handle, and compressive strength, However, the results obtained allowed us to verify that, with regard to the chemical aspect, there was a significant and expected increase in loss on ignition for the sample group containing limestone filler. Regarding the insoluble residue, values above the allowed for the sample group containing deactivated alumina were noted and through the FRX analysis, it was possible to check the oxides of raw materials and cements. As for the physical aspects, it was found that there is a strong relationship between the higher compressive strengths and the physical effects provided by the presence of ultrafine particles. The additions resulted in cements with high compressive strength for all ages in view until 50% reduction of clinker in the composition of CPI and CPV ARI RS cements.
- ItemObtenção de nanocelulose do resíduo de bagaço de cana-de-açúcar para o reforço em máscaras cirúrgicas de Tecido Não Tecido (TNT)(Universidade Federal do Espírito Santo, 2022-05-25) Zortea, Luciana Ferreira; Pinheiro, Iara Rebouças; http://lattes.cnpq.br/8986864745281356; https://orcid.org/0000-0002-2399-0313; http://lattes.cnpq.br/9193063383836521; Baranano, Audrei Gimenez; https://orcid.org/0000000201745202; http://lattes.cnpq.br/6155024776819193; Dias, Matheus Cordazzo; https://orcid.org/0000-0002-8154-2543; http://lattes.cnpq.br/1770602768152305The Covid-19 pandemic has brought up the discussion about the effectiveness of personal protective equipment (PPE). Among the improvement research of PPE, nanocellulose films stand out and the sugarcane bagasse is the lignocellulosic residue used for the production of nanocellulose. The objective of the work was to produce and characterize cellulose nanofibrils from sugarcane bagasse residue and apply them in surgical masks made of NWT. The sugarcane bagasse was chemically treated and XRD, FTIR and chemical characterizations were performed. To obtain the nanofibrils the combination of enzymatic hydrolysis and mechanical fibrillation (NFC-HE) and the mechanical fibrillation process (NFC) were used. The application of the cellulose nanofibrils on the NWT masks was performed by spray coating technique. Bacterial filtration and breathability analyses were performed on the coated masks. The results showed that the NFC-HE films presented better characteristics in relation to contact angle, density, porosity, transmittance and transparency and vapor permeability than the NFC films. The masks that received the coating showed an average filtration efficiency of 99.68% (NFC) and 99.80% (NFC-HE). Regarding breathability, the NFCHE coated masks presented mean values of 79.75 Pa/cm² and the NFC coated ones mean values of 106.00 Pa/cm². The results obtained in this study showed that the pretreatment of enzymatic hydrolysis before mechanical processing to obtain nanocellulose significantly improves their quality and that the coating of nanocellulose can be applied to improve the barrier capacity of materials used in the manufacture of surgical masks.
- ItemSíntese de biodiesel do óleo de algodão utilizando óxido de cálcio advindo da concha do sururu (Perna-perna) com adição do lítio em catálise heterogênea.(Universidade Federal do Espírito Santo, 2022-06-28) Carvalho, José Augusto Macedo; Baranano, Audrei Gimenez; https://orcid.org/0000000201745202; http://lattes.cnpq.br/6155024776819193; https://orcid.org/0000000257354550; Oliveira, Michel Picanco; https://orcid.org/0000000192410194; http://lattes.cnpq.br/6383844066460475; Souza, Murilo de OliveiraIn this work, we sought to apply, evaluate and characterize calcium oxide, produced by thermal degradation of sururu (Perna perna) shells as a possible heterogeneous catalyst. The catalyst produced from the shell was tested in two stages. In the first step, the catalyst was composed of calcium oxide after calcination, in the second step, the catalyst would have the addition of lithium to calcium oxide, by the wet impregnation method at 1.5% by mass of CaO. For the characterization of the catalytic material, TGA, FTIR, XRD and SEM-EDS analyzes were performed. The analyzes showed that the thermal transformation of calcium carbonate into calcium oxide was satisfactory, so that the mass loss during this transformation was 46%, which changed the chemical composition and crystalline structure and there were no changes in morphology. of the catalyst. The reaction products were characterized by NMR analysis, acidity index, specific mass, calcium content and viscosity, and it was possible to observe the formation of methyl esters and the efficiency of lithium as an impregnated material. The reaction containing a molar ratio between alcohol and oil of 6:1 showed 90% conversion of the methyl esters, without the addition of lithium. After the addition of lithium, the conversion of methyl esters was 84%, showing the presence of high rates of leached calcium. Although the reaction with the best conversion rate was performed with a catalyst without the addition of lithium, it was possible to notice that there was a significant decrease in calcium leaching of approximately 30%. The application of catalyst reuse without lithium showed a conversion greater than 80% until the second reuse, with a conversion drop in the third and returning greater than 80% in the fourth reuse. While the addition of lithium only achieved a conversion above 80%, the others showed a conversion below 50%. Thus, the catalysts produced from sururu shells have high reactivity, good conversion of esters, and still good replicability in studies using lithium as an impregnating material during the production of biodiesel.