Banca de DEFESA: DEBORAH CORDEIRO DE ANDRADE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DEBORAH CORDEIRO DE ANDRADE
DATA : 20/02/2018
HORA: 14:00
LOCAL: AUDITÓRIO DO NUPEG
TÍTULO:

"Calcium, strontium and iron carbonates solubility under interest conditions in the monoethyleneglycol regeneration process".

 

PALAVRAS-CHAVES:

Solubility, Carbonate Salts, Gas Hydrates, Solvent Regeneration.

PÁGINAS: 85
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Química
RESUMO:

The oil industry is constantly facing problems related to the exploitation of natural gas. During its production, fouling may be formed as, for example, gas hydrates, once the produced water is full of dissolved salts, thus blocking a passage of the fluid through the pipeline and also causing a corrosion of the production tubes. This occurs with changes in the temperature and pressure of the circulating fluid. As a way of solving this problem, chemicals are added to the drilling fluid. Monoethylene glycol (MEG) consists of a hydrate inhibitor widely used because it does not harm the environment, provides a low operating cost since it can be regenerated and chemically compatible with the constituents of the production fluid. In order to study interest conditions for MEG regeneration process, procedures and experimental apparatus were developed to promote data whose inhibitor effect together with sodium chloride effect, temperature, CO₂ partial pressure and pH in aqueous mixtures containing carbonate salts, such as, calcium, strontium and iron, in excess, were described. CO₂ partial pressures ranged from 760 to 1610 mmHg, temperature ranged from 5 to 50 °C, MEG concentrations swept the entire percentage range of mass percentage and sodium chloride was added at three concentrations: 1, 3 and 5 % in weight. A modified analytical method has been specifically developed for the system in which there is bubbling of carbon dioxide. Through the data analysis, it was possible to conclude that increasing temperature and MEG concentration provide a decrease in carbonate salts solubility. It was also found that carbonate salts concentration increases with the increase in CO₂ partial pressures and with NaCl presence NaCl up to 3 % in weight, since once its concentration becomes higher, 5 % in weight, the effect becomes reverse. A thermodynamic approach was applied in phase and chemical equilibria. In this modeling it was possible to quantify the MEG addition effects and carbon dioxide as well as the temperature on the carbonate salts solubility under study.

MEMBROS DA BANCA:
Interno - 1543286 - CAMILA GAMBINI PEREIRA
Externo à Instituição - ITALLA MEDEIROS BEZERRA - UFERSA
Interno - 1149554 - OSVALDO CHIAVONE FILHO