Banca de DEFESA: IZABELLA REGINA DE SOUZA ARAÚJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : IZABELLA REGINA DE SOUZA ARAÚJO
DATA : 26/07/2019
HORA: 14:00
LOCAL: AUDITÓRIO NUPEG
TÍTULO:

Phase equilibrium and volumetric behavior of aqueous systems containing CO₂, ethylene glycol and NaCl under the conditions of exploitation of natural gas.

PALAVRAS-CHAVES:

 Phase equilibrium, High pressures, Carbon dioxide, MEG, Density, Salts.

PÁGINAS: 134
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
SUBÁREA: Processos Industriais de Engenharia Química
ESPECIALIDADE: Processos Inorgânicos
RESUMO:

Gas explotation in deep water in Brazil brings challenges due to high pressures, low temperatures, high content of CO₂ and NaCl carried to the production fluids. The regeneration process of ethylene glycol (MEG), used as a hydrate inhibitor, also presents a field of study regarding the solubility and precipitation of NaCl salt. In this context, this work included the assembly of an experimental apparatus for the evaluation of phase equilibrium in mixtures, under conditions of temperature and pressure, close to those of gas exploration in deep waters, evaluating parameters such as density and solubility, at pressures from 4,0 to 31.0 MPa and temperatures of 293.15 and 323.15 K. The experimental apparatus was assembled through the interconnections between an Anton Paar 4200M densimeter, a syringe pump and thermostatic baths with two types of pressure vessels: the Parr reactor 4561 and a variable volume equilibrium cell. The density points obtained with the experimental apparatus were validated with data and models from the literature. For this purpose, simple systems such as the pure CO₂ and water were used (mean deviations of 0.02% for CO₂ and 0.15% for water when compared to specific equations for these components), and the CO₂ + water (mean deviations below 0.07% when compared with models obtained from literature data). The calibration of the densimeter was carried out to allow using at temperatures between 293.15 and 329.85 K, and pressures between 1.0 and 31.0 MPa, with tetrachloromethane and ethanol, resulting in an uncertainty of 0.09%. In addition to the experimental data obtained from the previously mentioned pure components and the CO₂ + water binary system, data were also obtained for the water + NaCl binary system, for the CO₂ + water + NaCl ternary system (1 molal and 4 molal saline solutions) and the CO₂ + water + MEG (30%, 50% and 80% m/m MEG aqueous solutions concentrations). The software Specs v5.63 and a code made in MATLAB were used to verify which equation of state (Soave-Redlich-Kwong or Peng-Robinson cubic equations or Cubic Plus Association equation) was more adequate to predict the aqueous phase density of the binary and ternary systems with absence of electrolytes under experimental conditions; it being concluded that the use of Cubic Plus Association equation (CPA) resulted in more coherent values of the density of the aqueous phase. In the case of systems containing electrolytes, models developed from literature data were used for comparison with the experimental data of this work.

 

MEMBROS DA BANCA:
Externo ao Programa - 001.672.425-98 - ANDERSON ALLES DE JESUS - UNIT
Externa à Instituição - DANNIELLE JANAINNE DA SILVA - UFRN
Externo à Instituição - DIVAL DE BRITO GUERRA NETO
Presidente - 1149554 - OSVALDO CHIAVONE FILHO