Utilização da análise térmica para avaliação da qualidade do biodiesel.
This work aims to use thermal analysis as a tool to evaluate biodiesel quality, evaluate the ester content by thermogravimetry(TG/DTG) and thermal stability by Differential Scanning Calorimetry under pressure (P-DSC). The biodiesels Cotton and Castor were obtained through the transesterification rea...
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| Format: | bachelorThesis |
| Jezik: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Online dostop: | https://repositorio.ufrn.br/handle/123456789/38349 |
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| Izvleček: | This work aims to use thermal analysis as a tool to evaluate biodiesel quality, evaluate the ester content by thermogravimetry(TG/DTG) and thermal stability by Differential Scanning Calorimetry under pressure (P-DSC). The biodiesels Cotton and Castor were obtained through the transesterification reaction by ethyl route in the presence of KOH. The main physico-chemical properties of cotton B100 and Castor were determined. The determination of the ester content in the samples of cotton seed oil, cotton blends of biodiesel and the oil/biodiesel in proportions of 25:75, 50:50 and 75:25 were analyzed by thermogravimetry (TG / DTG) and absorption spectroscopy in the infrared Fourier Transform Spectroscopy (FTIR). To study the oxidation process of cotton biodiesel with castor oil in different concentrations, were prepared blends BIOALG/ BIOMAM in ratio of 75:25, 50:50 and 25:75, the samples were analyzed by differential scanning calorimetry under pressure (P-DSC) and absorption spectroscopy in the infrared Fourier Transform spectroscopy (FTIR). The cotton biodiesel show results in accordance with the specifications of ANP Resolution N°45/2014 for density, kinematic viscosity, acid index and flash point. However the castor biodiesel only presented results in accordance to the flash point analysis. The TG / DTG curves of cotton biodiesel and show that all triglycerides were successful transesterified, because both the TG curves of oil as biodiesel showed a single step of mass loss. In the evaluation of the ester content by thermogravimetry(TG/DTG), we can conclude that with the addiction of cotton oil, two steps of mass loss appeared, relative with the quantity of oil added. The appearance of esters was confirmed by characteristic absorption bands of the transesterification process, in range of 1000 and 1600 cm-1 by FTIR technique. In study of cotton biodiesel oxidation process with different castor biodiesel concentrations, we can see with the increase of castor concentration, the oxidation temperature also increase, that is the thermal Oxidative stability is increased, confirmed by the FTIR specters, where the behavior of peaks and bands are characteristic |
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