Bibian Hoyos | Universidad Nacional de Colombia (National University of Colombia) (original) (raw)
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Issue 191 by Bibian Hoyos
The solubility of CO2 in Colombian heavy oil was calculated using the Peng-Robinson cubic equatio... more The solubility of CO2 in Colombian heavy oil was calculated using the Peng-Robinson cubic equation of state and the Lee-Kesler correlations. The crude was represented as a mixture of pseudo-components and for each one of them, the thermodynamic and critical properties were estimated. The results obtained in representing the oil with four, five and six pseudo-components show that all these representations produce similar results and therefore the use of four pseudo-components is sufficient and has a lower computational cost. Excellent results were obtained by comparing the experimental and calculated data. For this system, it is enough to have a complete characterization of the SARA analysis and to use four pseudo-components to adequately model the vapor-liquid equilibrium of CO2 -heavy oil.
Papers by Bibian Hoyos
Revista Facultad de Ingeniería Universidad de Antioquia, 2015
In this work it was studied the temperature and initial monomer concentration (aniline) effect up... more In this work it was studied the temperature and initial monomer concentration (aniline) effect upon the morphology and conductivity of polyaniline obtained by electro- polymerization with cyclic voltammetry on glassy carbon supports. The initial aniline salt was characterized by Infrared Analysis (I.R.). The morphology of the obtained polyaniline was analyzed by Scanning Electronic Microscopy (S.E.M.), and conductivity by Electrochemical Impedance
Información tecnológica, 2007
The solubility of CO2 in Colombian heavy oil was calculated using the Peng-Robinson cubic equatio... more The solubility of CO2 in Colombian heavy oil was calculated using the Peng-Robinson cubic equation of state and the Lee-Kesler correlations. The crude was represented as a mixture of pseudo-components and for each one of them, the thermodynamic and critical properties were estimated. The results obtained in representing the oil with four, five and six pseudo-components show that all these representations produce similar results and therefore the use of four pseudo-components is sufficient and has a lower computational cost. Excellent results were obtained by comparing the experimental and calculated data. For this system, it is enough to have a complete characterization of the SARA analysis and to use four pseudo-components to adequately model the vapor-liquid equilibrium of CO2 -heavy oil.
Revista Facultad de Ingeniería Universidad de Antioquia, 2015
In this work it was studied the temperature and initial monomer concentration (aniline) effect up... more In this work it was studied the temperature and initial monomer concentration (aniline) effect upon the morphology and conductivity of polyaniline obtained by electro- polymerization with cyclic voltammetry on glassy carbon supports. The initial aniline salt was characterized by Infrared Analysis (I.R.). The morphology of the obtained polyaniline was analyzed by Scanning Electronic Microscopy (S.E.M.), and conductivity by Electrochemical Impedance
Información tecnológica, 2007
Asphaltene aggregation process was studied using molecular dynamics techniques. Four different st... more Asphaltene aggregation process was studied using molecular dynamics techniques. Four different structures were used. The first three
molecules have a continental structure, with condensed aromatic cores, while the forth has an archipelago structure, with small groups of
aromatic rings connected with saturated chains. The molecules were constructed in an atomistic framework, in which atoms are described
individually. Interaction forces were calculated at 300 K and 200 atm; Van der Waals and electrostatic interactions were evaluated
separately. For all four molecules the solubility parameter was calculated. It was found that Van der Waals interactions due to the
presence of aromatic rings and electrostatic forces caused by the presence of heteroatoms such as oxygen, nitrogen and sulfur, are equally
relevant in the aggregation of asphaltene molecules. For all molecules it was found asphaltene systems are more stable in aggregation
state than in monomeric state. For continental structures, the presence of long ramifications obstructs the formation of asphaltene
aggregates. For archipelago structures, the flexibility of the molecules enables the aggregation with other structures. The presence of
heteroatoms creates a repulsive force that hinders the aggregation process. The molecular volume and the cohesive energy are also
sensitive to the geometric configuration and the composition of the species, which affects the solubility parameter.