Banca de QUALIFICAÇÃO: MATEUS FERNANDES MONTEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : MATEUS FERNANDES MONTEIRO
DATE: 30/11/2020
TIME: 14:00
LOCAL: https://meet.google.com/tsw-mvbt-wft
TITLE:

MONO ETHYLENOGLYCOL REGENERATION UNIT: EXPERIMENTAL DATA, THERMODYNAMIC MODELING AND PROCESS SIMULATION

KEY WORDS:

Hydrate inhibitor. Phase balance. Electrolyte thermodynamics. UNIQUAC. ENRTL. Process simulation.

PAGES: 61
BIG AREA: Engenharias
AREA: Engenharia Química
SUMMARY:

Gas hydrates are crystalline solids and may cause several harsh consequences for natural gas production in subsea lines. Monoethylene glycol (MEG) is the most used thermodynamic hydrate inhibitor. Vapor–liquid equilibrium (VLE) data for aqueous systems in the presence of electrolytes have many industrial applications. VLE data for water + MEG mixtures in the presence of sodium chloride at low pressures are important to describe the effects of composition, temperature and pressure on MEG regeneration unit. The regeneration aims to remove water and salt present in the rich MEG stream, resulting in lean MEG. In the gas production context, MEG is regenerated to reduce operational costs, due to the large amount required. The MEG regeneration process consists mainly of a three-phase separator, flash evaporator with brine removal, and distillation column. A modified version of the Othmer ebulliometer was applied to measure reliable VLE data for water + MEG + NaCl at 101.325, 65 and 35 kPa. Binary systems water + MEG and MEG + NaCl were also experimentally studied. The Electrolyte Nonrandom Two-Liquid (ENRTL) and Universal Quasi-Chemical Activity Coefficient (UNIQUAC) models were successfully parameterized to describe the VLE behavior for water + MEG+ NaCl systems. Thermodynamic consistence of the datasets was also checked. MEG+NaCl solutions presented an inverted colligative property, i.e., the addition of salt decreases the boiling point. NaCl solubility were also measured from 293.15 to 403.15 K in the whole MEG concentration range. The experimental method used for the determination of salt solubility data was analytical (density measurements) and based on the reproducibility of the concentration of two successive samples. The temperature dependence on the solubility of NaCl is relatively weak compared to other salts and a reverse trend behavior with increasing temperature has been described for MEG contents higher than 90 wt%. Excess solubility has been correlated with Redlich–Kister expansion. Solid–liquid equilibrium data were also used for ENRTL parametrization. The parameterized models allow the simulation of the MEG regeneration process in the Aspen Plus, describing satisfactorily water and NaCl separation at flash evaporator and distillation column.

BANKING MEMBERS:
Presidente - 1149554 - OSVALDO CHIAVONE FILHO
Interno - 347289 - AFONSO AVELINO DANTAS NETO
Externa ao Programa - 214.141.303-68 - MARIA CARLENISE PAIVA DE ALENCAR MOURA - UFRN
Externo à Instituição - ANDERSON ALLES DE JESUS - UFRN