Quantitative Raman spectroscopic investigation of geo-fluids high-pressure phase equilibria: Part II. Accurate determination of CH4 solubility in water from 273 to 603 K and from 5 to 140 MPa and refining the parameters of the thermodynamic model

• DOI: 10.1016/j.fluid.2015.01.025
• Publication Date: 2015-01-31T16:01:18Z
• Authors: Wenjia Ou; Lantao Geng; Wanjun Lu; Huirong Guo; Kang Qu; Peixiao Mao
• Keywords: 01 natural sciences; 0105 earth and related environmental sciences

Abstracts CH 4 solubilities in water at temperatures from 273.15 to 603.15 K and pressures from 5 to 140 MPa were systematically determined using quantitative Raman spectroscopy, and 239 solubility data were reported. The solubility data obtained from 313.15 to 533.15 K are generally consistent with previous experimental and thermodynamic studies. However, predictions of the Duan's model for temperatures below 313.15 K and above 533.15 K substantially deviate from the new measurements due to the previous lack of accurate experimental data in these P – T ranges. Parameters of the model were then refined, and the solubility data can now be accurately reproduced by the model with an AAD of 1.73%.