TY  - JOUR
ID  - scholars686
KW  - 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
KW  -  Carbon dioxide; Hydrates; Hydration; Liquids; Sodium; Sodium chloride; Ternary systems; Wastewater treatment
KW  -  Phase equilibria
N2  - 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.
IS  - 1
VL  - 284
A1  - Sabil, K.M.
A1  - Witkamp, G.-J.
A1  - Peters, C.J.
JF  - Fluid Phase Equilibria
UR  - https://www.scopus.com/inward/record.uri?eid=2-s2.0-67651120025&doi=10.1016%2fj.fluid.2009.06.006&partnerID=40&md5=6a1f413ef2ccfc9020123ffa9ab87969
Y1  - 2009///
TI  - Phase equilibria of mixed carbon dioxide and tetrahydrofuran hydrates in sodium chloride aqueous solutions
SP  - 38
N1  - cited By 33
AV  - none
EP  - 43
SN  - 03783812
ER  -