Vapor–Liquid Equilibrium of Methane with Water and Methanol. Measurements and Modeling

Abstract

There is a need for high-quality experimental phase equilibrium data in the petroleum and chemical industries, for example, mixtures of oil and gas with gas hydrate inhibitors (methanol, glycols) and organic acids. This includes a wide range of different systems, which all deal with processes that rely on phase equilibrium data for optimization. The objective of this work is to provide experimental data for hydrocarbon systems with polar chemicals such as alcohols, glycols, and water. New vapor–liquid equilibrium data are reported for methane + water, methane + methanol, and methane + methanol + water for several temperatures in the range 284 K to 324 K and in the pressure range (5 to 20) MPa. The Cubic-Plus-Association (CPA) equation of state is used to model the phase equilibria data measured. A good agreement between predictions and experimental data is observed, supporting the reliability of the new data.

Effect of Ion Valency on the Properties of the Carbon Dioxide–Methane–Brine System

“…Similar behavior was also observed by Míguez et al 31 The estimates of species mole fractions in the carbon dioxide−methane−water system may be essential to improve injection approaches during geological carbon dioxide storage and gas production. 2,4,6,[11][12][13] ions and their stronger repulsion from the interface as compared to Na + (see below).…”

“…Also shown inFig. 3are the experimental[11][12][13] (closed symbols) and the MD simulation 17 (open symbols) results. We see that our theoretical calculations are in good quantitative agreement with the experimental results.…”

An experimental investigation of the phase equilibrium of the binary system (methane + water) at low temperatures: Solubility of methane in water and three-phase (vapour + liquid + hydrate) equilibrium

“…Binary system (CH 4 + H 2 O) at 283 K: The mole fraction of water y 2 in the vapour phase: •, prediction results (present work); , Chapoy et al (2003) [71]; ▼, Mohammadi et al (2004) [72]; , Chapoy et al (2005) [73]; , Frost et al (2014)[25].…”

“…Solubility of CH 4 in H 2 O at 298 K: Experimental results for the total pressure p plotted versus m 1 /m 0 where m 1 is the molality of CH 4 in water (in mol/(kg H 2 O)) and m 0 = 1 mol/(kg H 2 O): •,Kim et al (2003) [19]; ■, [21]; ▲,Awan et al (2010) [23]; ,Frost et al (2014) [25].…”

Measurement of vapor–liquid–liquid phase equilibrium—Equipment and results

“…presents the values relative to the solubility of methane in the liquid phase and methanol in the gas phase, making a comparison to literature sources[16][17][18]. The results gathered in the analytical study of this binary system confirm the correct performance of the analytical part of the apparatus, even in challenging conditions such as these, with the determination of very low agreement between the results obtained in this work and the literature values can be observed, confirming not only the quality of the apparatus developed, but also the validity of the performed calibrations.…”