Unidade de regeneração de monoetilenoglicol: dados experimentais e modelagem termodinâmica
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 indus...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/33321 |
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| Resumo: | 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 Non–random 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 aiming the description of solid–liquid and vapor–liquid
equilibrium with a unique set of parameters. |
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