Comportamento do fenômeno de parafinação em óleo pesado na presença de líquido de castanha de caju (Anacardium occidentale)

• Autor(a) principal: Strappa, Renata Evangelista
• Data de Publicação: 2018
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFS
• Texto Completo: https://ri.ufs.br/jspui/handle/riufs/17793
• topic: Engenharia química; Cristalização; Petróleo; Castanha-de-caju; Indústria; Cinética de cristalização; Ozawa; TIAC; LCC; Óleo pesado; Kinetics of crystallization; Ozawa; WAT; CNSL; Heavy oil; ENGENHARIAS::ENGENHARIA QUIMICA

Paraffin deposition is a challenging problem for the oil industry. At the temperature and pressure conditions of the reservoir, paraffin is present in the oil in the dissolved form, however, at the stage of oil extraction, exploration and production, it loses the thermodynamic equilibrium condition and begins to crystallize, forming agglomerates the oil flow. Some studies have been and are being developed to test useful methods to avoid the formation of wax in pipelines and, for this, it is necessary to know the thermodynamic behavior of paraffin crystallization, which allows, through the use of kinetic models, to know the mechanisms of nucleation and crystal growth rate, as well as the initial paraffin precipitation temperature (WAT). The present work analyzed the kinetics of paraffin crystallization and the WAT in heavy oil in the presence of cashew nut liquid, denominated in this LCC study, by the kinetic model of crystallization Ozawa and WAT and energy of nucleation activation of paraffin present in the sample of heavy oil under study, by rheological measurement, by means of the Arrhenius equation. The results obtained showed that the Ozawa model was efficient in evaluating the kinetics of non-isothermal crystallization of paraffin in heavy oil, and the value of the WAT obtained was in agreement with the value obtained by rheological measurements, 41 ± 1ºC. The addition of LCC did not lead to a reduction in the WAT value, however, it reduced the activation energy from 679.03 J / mol to 494.07 J / mol, in the presence of 60 ppm of LCC, which can be attributed to a greater dispersion of precipitates, by solvation, which contributes to improve the conditions of oil flow, which favors the guarantee of heavy oil flow.