Determination of CO₂ Solubility in Saturated Liquid CH₄ + N₂ and CH₄ + C₂H₆ Mixtures above Atmospheric Pressure

Abstract

Accurate CO 2 solubility data are crucial for putting a proposal of pressurized liquefied natural gas (PLNG) project into practice. A solid−liquid equilibrium (SLE) apparatus, which is based on the static−analytic method, has been set up to measure the solubility of carbon dioxide in saturated liquid CH 4 /CH 4 + N 2 /CH 4 + C 2 H 6 in the pressure region from atmospheric up to 3 MPa, corresponding to the temperature region from (112 to 170) K. In addition, Peng− Robinson (PR) and Suave−Redlich−Kwong (SRK) equationsof-state (EOS) are selected to calculate the solubility of carbon dioxide in CH 4 + N 2 and CH 4 + C 2 H 6 mixtures, and the results are consistent with the experimental data in the whole region. Two temperature-dependent correlations for the interaction coefficients k ij on CH 4 + CO 2 system are derived by the experimental data for PR and SRK EOS, which can improve the calculation accuracy of the binary and ternary solid−liquid phase equilibrium.

Application of Peng-Robinson Equation of State for Calculating Solid-Vapor and Solid-Liquid Equilibrium of CH4-CO2 System

“…7;2015 PR-EoS was also applied to calculate SLE in term of solubility of CO 2 (x 2 ) for CH 4 (1) + CO 2 (2) system with k ij proposed by ZareNezhad and Eggeman (2006). The results were compared with the experimental data obtained by Shen et al (2012) and giving a good accuracy with average absolute deviation of 0.5% between calculated and experimental solubility data. The comparison was presented in Figure 4.…”

Integration of CO 2 cryogenic removal with a natural gas pressurized liquefaction process using gas expansion refrigeration

“…Fig. 1 shows the molar solubility of CO 2 in LNG at various temperatures [31]. As shown, CO 2 molar solubility in the LNG product (~111 K) is about 0.02%, thus the LNG specification for CO 2 is 0.01% taking account of the safety margin.…”

Simultaneous Multiphase Flash and Stability Analysis Calculations Including Solid CO2 for CO2–CH4, CO2–CH4–N2, and CO2–CH4–N2–O2 Mixtures

“…More details on SVE data are reported in Tables S15–S18 in the Supporting Information. In Table , the data from Shen et al and Gao et al are not reported, since they are presented as SLE data, though Riva and Stringari observed they are actually SLVE data for which only the CO 2 mole fraction in the liquid phase was reported.…”