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| Author(s): |
Rafael Mauricio Matricarde Falleiro
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Química |
| Defense date: | 2012-11-30 |
| Examining board members: |
Maria Alvina Krähenbühl;
Osvaldo Chiavone Filho;
Marlus Pinheiro Rolemberg;
Martín Aznar;
Roberta Ceriani
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| Advisor: | Maria Alvina Krähenbühl; Antonio José de Almeida Meirelles |
| Abstract | |
This study aims to determine vapor-liquid equilibrium (VLE) data of binary systems of fatty acid and ethyl esters by differential scanning calorimetry (DSC). This is a highly accurate analytical technique that involves thermal analysis methods used extensively in the study of physical transitions. DSC has some advantages over conventional techniques (ebulliometry) like shorter time and use of small amounts of sample. The high price of fatty compounds made them unsuitable to be studied by conventional techniques, since the required amount of reagent is higher than 100 g. This fact resulted to a search for an alternative method (DSC) able to get data for VLE binary systems thitherto unprecedented in the literature. The methodology based in the total pressure method was effective for determining the boiling temperature of the fatty compounds. The vapor pressure was investigated between 10 and 70 mmHg, while the binary systems were measured at 20 mmHg, using very small sample amounts (4.0 to 6.0 mg). For all the systems proposed, samples were prepared at different concentrations whose molar fraction of the more volatile component varied 0.1 spanning the range 0 to 1. The thermodynamic modeling allowed the determination of binary interaction parameters of conventional models used to describe the non-ideality of the liquid phase. These data are necessary for the design of equipment for the biodiesels production and essential to improve the purification process (AU) | |
| FAPESP's process: | 08/08706-1 - Experimental Determination of Vapor-Liquid Equilibria Data of Binary Mixtures Fatty Acid Ethyl Esters and Fatty Acids by means of DSC. |
| Grantee: | Rafael Mauricio Matricarde Falleiro |
| Support Opportunities: | Scholarships in Brazil - Doctorate |