Banca de QUALIFICAÇÃO: THALES CAINÃ DOS SANTOS BARBALHO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE : THALES CAINÃ DOS SANTOS BARBALHO
DATA : 23/01/2017
HORA: 14:00
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:

"Characterization of petroleum samples: a computational approach and thermodynamic modeling"

PALAVRAS-CHAVES:

 Characterization; Pseudocomponents; Equation of State; Equilibrium cell; Bubble Pressure.

PÁGINAS: 79
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

It is known that for the pure substances the critical parameters can be found in the literature, but in the case of multicomponent systems the experimental data are scarce. The lack of this information is due to the difficulty in the experimental determination, since in the phase equilibrium of mixtures involving CO2 and oil or its residues is not simple. In order to determine the composition and critical properties of the pseudocomponents present in the fractions of the studied samples, the aim of this dissertation was to characterize the thermodynamic properties of samples of petroleum derivatives in order to develop a computational methodology. Being this procedure validated by obtaining experimental data of the bubble pressure of the different systems studied, comparing these with the simulation data. The analyzed samples were taken from the production field of a company operating in the western region of the state of Rio Grande do Norte, called gas condensate (CG) and light oil fraction (FPL). In order to measure the density of the sample, a previously calibrated pycnometer was used, that is, with its known volume, in which the density of the dry pycnometer and the sample This procedure done in triplicate. Subsequently, the atmospheric distillation of the sample was carried out, where an amount equivalent to 100 ml of the distillate was weighed, which was subjected to an increase in temperature from the ambient. A thermostatic heating mantle (maximum temperature of 300° C) and a thermometer for temperature monitoring were used. The distilled fractions were collected after passing through a condenser (20°C), the boiling temperature and density being also recorded by pycnometry. Based on these two parameters, it was possible to calculate the molecular mass (MM), using the Riazi-Daubert correlation, as well as the temperature (Tc) and the critical pressure (Pc) using the Lee-Kesler correlations and the acentric factor (ω) from the Edmister correlation of each fraction collected. For the validation of the characterization, bubble pressure experiments were performed with the sample in an equilibrium cell in which it is possible to visualize the phase change, that is, through the visual method, for different operating conditions. The composition of the samples ranged from 20 to 60% while the temperature was from 30 to 120°C. The results obtained were compared with those simulated by SPECS v5.63 software. It was possible to observe that the characterization performed was able to fit the experimental data, since for the systems involving CO2-CG the calculated errors were, on average, 4.46%, 4.84% and 3.71%, respectively for SRK, PR and ALS equations of state, while for CO2-FPL these values were, on average, 7.48%, 4.65% and 2.65%, respectively, for the same equations of state. It can be concluded that the present dissertation had the objectives reached and that the methodology used had a satisfactory performance to describe the studied sample, being able to be applied to different petroleum samples. The main contribution of this procedure is its practicality in the use of pseudo-components to represent the fluid in simulators, thus facilitating the decisions to be made within the process.

MEMBROS DA BANCA:
Externo à Instituição - DANNIELLE JANAINNE DA SILVA - UFRN
Externo ao Programa - 1670497 - HUMBERTO NEVES MAIA DE OLIVEIRA
Presidente - 1149554 - OSVALDO CHIAVONE FILHO