Carlos E.F. da Costa
Federal University of Pará
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Featured researches published by Carlos E.F. da Costa.
Pharmacognosy Magazine | 2015
Marcos Antônio Pena Muniz; Marina Nídia Ferreira dos Santos; Carlos E.F. da Costa; Luiz Morais; Maria Louze Nobre Lamarão; Roseane Maria Ribeiro-Costa; José Otávio Carréra Silva
The present study aimed at characterizing the oil extracted from Bertholletia excelsa H.B.K. almond, a native species from the Amazon region. Analytical methods used for oils and fats were employed through pharmacopoeia assays, AOCS (American Oil Chemists Society) standard methods as well as those recommended by ANVISA (National Health Surveillance Agency) such as acidity, peroxide value, saponification index, iodine value and refractive index, pH and relative density, and also thermoanalytical analyses (thermogravimetry, differential thermogravimetry and differential thermal analysis) as well as chromatographic analysis (gas chromatography). The characterization assessments of B. excelsa oil showed results indicating that the oil contains polyunsaturated fatty acids in large proportion. The termoanalytical tests indicated that B.excelsa oil showed thermal stability up to 220 °C, These results showed that the oil extracted from B. excelsa has acceptable characteristics and is of good quality.
Bioresource Technology | 2011
Luís Adriano S. do Nascimento; Rômulo Simões Angélica; Carlos E.F. da Costa; José R. Zamian; Geraldo N. da Rocha Filho
The distillate produced by deodorization of palm oil (DDPO) is a waste that corresponds to 4% of the product formed in this process. DDPO is 83% free of fatty acids (FFA), making it a good material for biodiesel production. In this paper, a catalyst prepared from a waste material, Amazon flint kaolin, was used for the esterification of DDPO with methanol. Leached metakaolin treated at 950°C and activated with 4M sulfuric acid (labeled as MF9S4) offered maximum esterification activity (92.8%) at 160°C with a DDPO:methanol molar ratio of 1:60 and a 4-h reaction time. The influences of reaction parameters, such as the molar ratio of the reactants, alcohol chain length, temperature, time and the presence of glycerides and unsaponifiable matter, have also been investigated. Based on the catalytic results, esterification of DDPO using MF9S4 can be a cheaper alternative for production of sustainable fuels.
Magnetic Resonance in Chemistry | 2012
Natasha Coral; Elizabeth Rodrigues; Victor Marcos Rumjanek; José R. Zamian; Geraldo N. da Rocha Filho; Carlos E.F. da Costa
Production of alternative fuels, such as biodiesel, from transesterification of vegetable oil driven by heterogeneous catalysts is a promising alternative to fossil diesel. However, achieving a successful substitution for a new renewable fuel depends on several quality parameters. 1H NMR spectroscopy was used to determine the amount of methyl esters, free glycerin and acid number in the transesterification of soybean oil with methanol in the presence of hydrotalcite‐type catalyst to produce biodiesel. Reaction parameters, such as temperature and time, were used to evaluate soybean oil methyl esters rate conversion. Temperatures of 100 to 180 °C and times of 20 to 240 min were tested on a 1 : 12 molar ratio soybean oil/methanol reaction. At 180 °C/240 min conditions, a rate of 94.5 wt% of methyl esters was obtained, where free glycerin and free fatty acids were not detected. Copyright
Journal of the Brazilian Chemical Society | 2015
Leyvison Rafael V. da Conceição; Carlos E.F. da Costa; Geraldo N. da Rocha Filho; Edenir Rodrigues Pereira-Filho; José R. Zamian
In this work, the transesterification of jupati (Raphia taedigera Mart.) oil using ethanol and acid catalyst was examined. The production of biodiesel was performed using a central composite design (CCD). A range of values for catalyst concentration (1 to 4.21%), temperature (70-80 °C), and the molar ratio of alcohol to oil (6:1-13.83:1) were tested, and ester content, viscosity, and yield were the response variables. The synthesis process was optimised using response surface methodology (RSM), resulting in the following optimal conditions for the production of jupati ethyl esters: a catalyst concentration of 3.85% at 80 °C and an alcohol-to-oil molar ratio of 10:1.
Revista Virtual de Química | 2014
D. R. Nascimento; Orlando Santos Neto; Leyvison Rafael V. da Conceição; Carlos E.F. da Costa; G. N. Rocha Filho; José R. Zamian
This study proposes to evaluate the influence of the addition of biodiesel to diesel in relation the combustion quality of Diesel/Biodiesel mixtures by monitoring the carbon residue. Biodiesel methyl and ethyl esters were synthesized from soybean oil using KOH as catalyst. The diesel and the methyl and ethyl esters were characterized according to official methods. The mixtures were obtained in proportions of 5 %, 10 %, 15 %, 20% and 25% of biodiesel in diesel and were evaluated by analyzes of microresidue carbon, higher heating value and kinematic viscosity. The results show an increase of the carbon residue with the content of biodiesel and also with the increase of the chain of the methyl ester (biodiesel methyl to ethyl biodiesel) which may indicate a greater possibility of carbon residue deposits in the injection system and the engine pistons.
Fuel | 2009
Alipio C. Carmo; Luiz K.C. Souza; Carlos E.F. da Costa; Elson Longo; José R. Zamian; Geraldo N. da Rocha Filho
Dyes and Pigments | 2009
Luiz K.C. de Souza; José R. Zamian; Geraldo N. da Rocha Filho; L. E. B. Soledade; Ieda M. G. Santos; A. G. Souza; Thomas Scheller; Rômulo Simões Angélica; Carlos E.F. da Costa
Carbon | 2013
Luiz K.C. de Souza; Nilantha P. Wickramaratne; Aimé Serge Ello; Maria J. F. Costa; Carlos E.F. da Costa; Mietek Jaroniec
Applied Catalysis B-environmental | 2011
Luís Adriano S. do Nascimento; Laura M.Z. Tito; Rômulo Simões Angélica; Carlos E.F. da Costa; José R. Zamian; Geraldo N. da Rocha Filho
Applied Clay Science | 2011
Luís Adriano S. do Nascimento; Rômulo Simões Angélica; Carlos E.F. da Costa; José R. Zamian; Geraldo N. da Rocha Filho