Navegando por Autor "Nascimento, J. F."
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Artigo Thermal degradation of monoethylene glycol in aqueous saline solution: evaluation by thermogravimetric and physicochemical analyses(ACS Publications, 2019-06-11) Chiavone Filho, Osvaldo; Monteiro, Mateus Fernandes; Moura Neto, Mário Hermes de; Macedo, G. M.; Silva, G. V.; Silva, Dannielle Janainne; Pereira, L. S.; Nascimento, J. F.In order to represent the thermal effects of the operational conditions of a monoethylene glycol (MEG) regeneration unit, 86 wt % MEG aqueous solutions with salt concentrations up to 5.52 wt % were heated for 56 h in an ebulliometer. Seven analytical techniques were applied to the samples, aiming to evaluate MEG degradation. Results demonstrated that increasing the sodium chloride concentration from 0 to 5.52 wt % reduced the MEG thermal stability time from 44 to 8 h. Thermogravimetric analysis was the most adequate studied technique to quantify MEG thermal degradation. Measurements of MEG degradation were correlated, using an allometric expression for each sodium chloride concentration. The salt-free solutions presented 7.2% MEG degradation after 56 h heating, while for 5.52 wt % NaCl it increased to 21.1%. As expected, sodium chloride concentration and time of exposure to temperatures up to 140 °C are important variables for monitoring MEG thermal degradation, especially in the flash evaporator