Experimental and smoothed data are pre,ented for the O'olubility of methane in water for temperature, of 77. 100. 160, 220, 280, and 340'F at pre3sures to 10,000 psia.The minimum solubility phenomenon exists within this temperature range to pre"ures of 10.000 psia.

A preliminary investigation was made to determine the time required to attain equilibrium within the equilibrium cell for this, system.Experimental and smoothed data are presented for the solubility of ethane in water for temperatures of 100", 160 0 , 220 0 , 280 0 and 340 0 F at pressures to 10,000 psia.The minimum solubility phenomenon disappears at 10,000 psi a within this temperature range.

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COMPOSITIONS of the coexisting vapor and liquid phases have previously been reported over the temperature range of 100°to 250°F. (1). This work extends the range from -80°to 280°F. EXPERIMENTALWindowed equilibrium cells of stainless steel construction were designed to withstand 5000 p.s.i. pressure at temperatures up to 400°F. Calibrated thermocouples inserted at several places within the cells were used to measure the temperature of the equilibrium fluids. Bourdon-type gages, calibrated against a deadweight tester, were used to indicate the pressure inside the equilibrium cells. Equilibrium was attained by circulating the vapor from the top of the cells through magnetic-piston pumps and into the bottom of the cells.The low temperature data were obtained in a 500 c.c.

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The compositions and specific volumes of the coexisting phases of the methane-re-butane-water system were determined experimentally in the two-phase and three-phase regions at temperatures of 100°, 160°, 220°, and 280°F. and pressures to 3000 pounds per square inch absolute. The distribution of the three components between the phases may be used to predict the water content of hydrocarbon phases and solubility of gases in water.The presence of water in the methane-re-butane system shifts the composition of the dew point mixture at a given temperature and pressure by as much as 8%. Equilibrium constants relating the concentration ratios between the several phases are presented. SINCEwater is present in natural gas and petroleum reservoirs, quantitative phase equilibria data in the hydrocarbonwater systems are of engineering value. Considerable data on the formation of solid hydrates have been presented in some detail (3,6,16,17,32,42,48,49)• Table I lists the hydrocarbonwater systems reported in the literature. In most cases the data available cover only one of the phases present. Table I also includes inorganic gases and water at high pressure. The work reported here consists of an experimental investigation of the methane-re-butane-water system in the three-phase region at temperatures of 100°, 160°, 220°, and 280°F. and pressures extending to the three-phase critical pressures. In the twophase region, data were obtained at pressures of 2000 and 3000 pounds per square inch absolute.