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Phase equilibria of mixed carbon dioxide and tetrahydrofuran hydrates in sodium chloride aqueous solutions

K.M., Sabil and G.-J., Witkamp and C.J., Peters (2009) Phase equilibria of mixed carbon dioxide and tetrahydrofuran hydrates in sodium chloride aqueous solutions. Fluid Phase Equilibria, 284 (1). pp. 38-43. ISSN 03783812

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Abstract

In this work, the competing effects of sodium chloride (NaCl) and tetrahydrofuran (THF) on carbon dioxide hydrate formation are investigated through phase equilibrium measurements. The phase behaviour in the hydrate forming region for the binary system carbon dioxide-water, the ternary systems carbon dioxide-tetrahydrofuran-water and ternary carbon dioxide-sodium chloride-water and, in addition, the quaternary system carbon dioxide-tetrahydrofuran-water-sodium chloride are determined experimentally, using a Cailletet apparatus. All measurements are made in a temperature and pressure region of 275-290 K and 0.5-7.0 MPa, respectively. In these ranges, three different hydrate equilibrium curves are measured namely: H-LW-V, H-LW-LV-V and H-LW-LV. The formation of an organic-rich liquid phase in the systems due to a liquid-liquid two-phase split between water and tetrahydrofuran when pressurized with carbon dioxide causes the occurrence of an upper quadruple point (Q2) to evolve into a four-phase H-LW-LV-V equilibrium line. The presence of sodium chloride in the quaternary system enhances the split between the two liquids due to the salting-out effect. It was found that the hydrate promoting effect of tetrahydrofuran is able to suppress the inhibiting effect of sodium chloride especially at lower concentration of sodium chloride. © 2009.

Item Type:Article
Uncontrolled Keywords:Aqueous solutions; Binary systems; Competing effects; Concentration of; Equilibrium lines; Equilibrium measurements; Forming region; Four-phase; Hydrate equilibria; Hydrate formation; Inhibiting effect; Liquid Phase; Liquid-liquid; Phase behaviour; Phase splits; Pressure regions; Promoting effect; Quadruple points; Quaternary system; Quaternary systems; Salting-out effect; Tetrahydrofuran; Tetrahydrofuran hydrate; Carbon dioxide; Hydrates; Hydration; Liquids; Sodium; Sodium chloride; Ternary systems; Wastewater treatment; Phase equilibria
Subjects:T Technology > TP Chemical technology
Departments / MOR / COE:Departments > Chemical Engineering
ID Code:580
Deposited By: Dr Khalik Mohd Sabil
Deposited On:09 Mar 2010 02:08
Last Modified:19 Jan 2017 08:25

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