The mole fraction of methane, CH 4, dissolved in water can be calculated from the Henry’s Law constants of 2.42 × 10-5 atm-1 at 25°C and 1.73 × 10-5 atm-1 at 50.°C. Also called "swamp gas," "biogas," or, in coal mines, "fire-damp" or "coal-gas." Solubility in water at 10 degrees C (50 F) is 42 mg/L. At 100°C, its maximum solubility at 100 bar (10 MPa) is 6 × 10 −3 mole percent (mol %), rising to 8 × 10 −3 mol % at 2 kbar ().This behavior with an initial linear increase followed by a tendency to level off is typical of simple gases (1, 2). Fig. I was looking for some material properties. 5 shows the water solubility data at 120 bar for a mixture of 2.5% methane and another with 5% methane in comparison with pure CO2 data. New solubility data for methane, carbon dioxide, and their binary mixtures in pure water were obtained at 344.25 K and from 10 to 100 MPa. Methane is one of the simplest gases, and its solubility in water has been well studied at low pressures. Occurrence: Methane is common in nature, resulting from anaerobic digestion of plant and animal matter. 5. A thermodynamic model that combines a cubic equation of state (Peng−Robinson with kij given in the literature) with the Henry's law approach has been elaborated. Insoluble. The solubility of methane in 3 kmol/m 3 solutions of monoethanolamine, diethanolamine, and triethanolamine was measured from 25° to 125°C and pressures up to about 13 MPa. Measurements were also made for the solubility of methane in water at 25° to 125°C and pressures up to 18 MPa in order to confirm the accuracy of the experimental technique. As water temperature increases, CH4 solubility decreases. Solubility is very low at room temperature (20°C) Methane is saturated at about 0,023 grams per liter H2O Water solubility at 120 bar in CO2 - CH4 mixtures. The effect of the amount of impurities on water solubility was also studied. Water solubility at 120 bar in pure CO2 and in CO2 with 2.5% of O2, N2 or CH4. Solubility Of Gases In Water - posted in Industrial Professionals: While performing some practice problems (it’s been a long time since I graduated as a chemical engineer, have not fully applied the knowledge over time so decided to review some concepts). Solubility of CO2 in water from -1.5 to 100°C and from 0.1 to 100 MPa: Evaluation of literature data and thermodynamic modelling June 2003 Fluid Phase Equilibria 208(1-2):265-290 Fig. INTRODUCTION. Calculate the solubility of methane at these temperatures for a methane pressure of 10. atm above the solution. Less dense than air at room temperature.