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The water content of ethane, propane and their mixtures in equilibrium with liquid water or hydrates

1994; Elsevier BV; Volume: 95; Linguagem: Inglês

10.1016/0378-3812(94)80074-x

1879-0224

Kyoo Y. Song, Riki Kobayashi,

Hydrocarbon exploration and reservoir analysis

Song, K.Y. and Kobayashi, R., 1994. The water content of ethane, propane and their mixtures in equilibrium with liquid water or hydrates. Fluid Phase Equilibria, 95: 281-298. Experimental results for the water content are reported for the ethane-rich phase in the liquid and gaseous states in equilibrium with hydrates for pressures of 360 psia (2.483 MPa) and 500 psia (3.448 MPa), and at temperatures from −27.5°F (−33.1°C) to 50.9°F (10.5°C), as well as in the three-phase coexistence non-hydrate conditions at pressures ranging from 500 psia (3.448 MPa) to 700 psia (4.828 MPa) and temperature from 60°F (15.6°C) to 89°F (31.7°C), respectively. Also included are the water content measurements of the propane-rich phase in equilibrium with hydrates covering temperatures from −35.5°F (−37.5°C) to 37.4°F (3.0°C) at a constant pressure of 159 psia (1.097 MPa). Above the hydrate region the experimental conditions range from 48°F (8.9°C) to 80°F (26.7°C) and pressures of 90 psia (0.621 MPa) to 130 psia (0.897 MPa). Isobaric water content data at 600 psia (4.138 MPa) for the liquid hydrocarbon-rich phase are reported for four ethane-propane mixtures containing 30.5, 50.0, 75.0 and 89.5 mol% ethane with the remainder propane, in equilibrium with liquid water or hydrate at temperatures ranging from −0.4°F (−18°C) to 77°F (25°C). The water content data for two binary systems, ethane-water and propane-water, and four ternary systems, ethane-propane-water mixtures, have been used to estimate the equilibrium conditions for three-phase coexistence: (liquid water-liquid hydrocarbon-hydrate I or II, liquid hydrocarbon-hydrate I-hydrate II), and for a quadruple point (liquid water-liquid hydrocarbon-hydrate I-hydrate II). Equilibrium constants for water in the hydrocarbon-rich phases, i.e. the ratio of mole fraction of water in the gaseous hydrocarbon-rich phase to that of water in the liquid hydrocarbon-rich phase, are graphically presented along the three-phase coexistence locus, and along the non-hydrate conditions for the ethane-water and the propane-water systems.