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Articles by A.G. Souza
Total Records ( 8 ) for A.G. Souza
  J.C.O. Santos and A.G. Souza
  Liquid specific heat capacity of the derived of the motor lubricant oils it is of great practical importance in the branch of the petrochemical engineering, because it is associated with the refinery operations of petroleum and other correlated processes. This study aims to characterize thermal degradation process of motor mineral, synthetic and semi-synthetic lubricant oils, in relation to its liquid specific heat capacities. The analyzed lubricating oils present an increase in your heat transfer capacity in function of the increase of the temperature.
  J.C.O. Santos and A.G. Souza
  Kinetic parameters of commercial edible oils were evaluated. The thermal decomposition process of the oils occurred in three steps, due to polyunsaturated, monounsaturated and saturated fatty acids decomposition, respectively. Kinetic parameters were obtained using Coats-Redfern and Madhusudanan methods and presented good correlation. According to activation energy of the first thermal decomposition step, the following stability order is proposed: corn (A) > rice > corn > soybean > sunflower (A) > canola (A) > sunflower > olive.
  L.M.R. Lima , J.C.O. Santos and A.G. Souza
  The study of thermoanalytical and kinetic properties of lubricating lithium greases is of great importance to understand its behavior when submitted to different temperatures and atmospheres and as those conditions affect its performance. In the present research, thermal analyses and infrared spectroscopy of lubricating greases were accomplished to the lithium base. The lubricating greases were submitted to Thermogravimetry (TG) and Differencial Scanning Calorimetry (DSC) analysis.
  M.C.D. Silva , M.M. Conceicao , J.C.O. Santos and A.G. Souza
  The thermal decomposition kinetics of solid Zinc(II) bis(dialkyldithiocarbamate) complexes, Zn (S2CNR2)2, where R= i-C3H7, n-C4H9, i-C4H9 and n-C5H11, were studied by using isothermal thermogravimetric heating technique. Results show that the thermal decomposition of these complexes occurs in a homogeneous liquid phase, after melting, according to a unidimensional phase-boundary reactions model, R1. The thermal stability was found to be in the following order: Zn(S2CNBui2)2< Zn(S2CNPri2)2< Zn(S2CNBun2)2< Zn(S2CNPen2)2.
  J.C.O. Santos and A.G. Souza
  Thermal stability of commercial edible oils were investigated by non-isothermal Thermogravimetry/ Derivative Thermogravimetry (TG/DTG). Results obtained indicated that these parameters were dependent on composition of fatty acids, being influenced by the presence of natural and artificial antioxidants. According to the thermogravimetric curves, the following thermal stability sequence was suggested: corn>sunflower>soybean>rice>soybean+olive>sunflowe+olive>canola>olive.
  M.M. Conceicao , V.J. Fernandes , T.G. Nascimento , C.F.S. Aragao , R.O. Macedo and A.G. Souza
  The calorimetric curves of sweetener, standards and aspartame/lactose mixtures indicated displacement of transition temperatures in sweetener for smaller temperatures, decreasing the thermal stability. The images in the photovisual system confirmed the displacement of transition temperatures in sweetener and binary mixtures. The brown coloration in smaller temperatures has suggested interaction of aspartame with lactose similar the Maillard’s reaction. These techniques allow a rapid evaluation of possible interactions between raw material and excipients.
  M.M. Conceicao , J.C.O. Santos , P.A. Filgueiras , R.O. Macedo , V.J. Fernandes and A.G. Souza
  The thermogravimetric profile of sweetener, Aspartame (APM) and 5-Benzyl-3,6-dioxo-2-piperazineacetic acid (5BZ) standards presented six, four and one events of thermal decomposition, respectively. In sweetener and APM have occurred dehydration and volatilization of methanol, which was confirmed stoichiometrically. The Py-GC-MS results of APM and sweetener indicated volatilization of methanol and Phenylalanine Methyl Ester (PME), which were identified as products of thermal decomposition. The product PME was common at APM and 5BZ standards suggesting the conversion of APM to 5BZ. In sweetener occurred formation of PME by degradation process similar to APM.
  J.C.O.Santos , I.M.G. Santos and A.G. Souza
  This study seeks to characterize the thermal decomposition process of automotive mineral lubricant oils in relation to its kinetic properties. Using kinetic study of decomposition of automotive mineral lubricant oils, degradation energy can be evaluated. The kinetic study was accomplished using thermogravimetric curves based on weight loss as a function of temperature. The kinetic behavior of the analyzed lubricant oils depends on atmosphere and heating rates used in TG analysis. On the other hand, the results were satisfactory, presenting good correlation, with a linear correlation coefficient close of the unit with a low standard deviation.
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