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ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
PHASE BEHAVIOUR OF CARBON DIOXIDE HYDRATE SYSTEMS: A COMPARISON BETWEEN SODIUM CLORIDE AND ETHANOL INHIBITION EFFECT
Submission Author:
Moisés Marcelino Neto , PR
Co-Authors:
Amanda Guembaroski, Rigoberto Morales, Amadeu Sum
Presenter: Amanda Guembaroski
doi://10.26678/ABCM.ENCIT2016.CIT2016-0191
Abstract
In view of the possibilities for hydrate formation caused by carbon dioxide-rich fluids in the Pre-Salt fields’ production lines, this study focus on experimental measurements that were carried out so as to obtain fundamental insight into the phase behavior of carbon dioxide hydrate forming systems. This work focus on the influence of sodium chloride, a hydrate inhibitor, on the phase behavior and its implications in practical applications. In addition, the inhibition effect of the ethanol on hydrates is compared with that of sodium chloride at the same mass fraction. The phase behavior of carbon dioxide hydrate in the presence of ethanol was obtained in a previous experimental study. In the present study, the carbon dioxide hydrate phase behavior was measured using a high pressure equilibrium cell in the temperature range of 273-279 K. Experimental measurements were performed using the isothermal method by monitoring the pressure response of the system with volume changes. By taking advantage of the availability of the measured three-phase (LW-H-V) data, the enthalpy of dissociation of simple carbon dioxide and inhibited hydrates is estimated by using the Clausius-Clapeyron equation. Results showed that at the same mass fraction of inhibitor, sodium chloride exhibited a superior inhibition effect compared to that of the ethanol.
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