Measurement of Carbon Dioxide Freezing in Mixtures of Methane, Ethane, and Nitrogen in the Solid−Vapor Equilibrium Region

Abstract

A non-sampling visual observation technique was used to measure solid-vapor equilibria of carbon dioxide in mixtures of light natural gas constituents. Frost points for the carbon dioxide + methane binary were determined for mixtures containing 1.00 %, 1.91 %, and 2.93 % moles of carbon dioxide at pressures ranging from (962.1 to 3008.2) kPa and temperatures ranging from (168.6 to 187.7) K. The addition of ethane and nitrogen to the carbon dioxide + methane binary system was also examined while keeping the carbon dioxide composition constant to determine the effect on the frost point.

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

“…7;2015 Figure 1. Comparison of calculated frost points using present and literature k ij with experimental data (Le and Trebble, 2007) for SVE of CH 4 (1) + CO 2 (2) system for x 2 = 1% Figure 2. Comparison of calculated frost points using present and literature k ij with experimental data (Le and Trebble, 2007) for SVE of CH 4 (1) + CO 2 (2) system for x 2 = 1.91% Figure 3.…”

“…Comparison of calculated frost points using present and literature k ij with experimental data (Le and Trebble, 2007) for SVE of CH 4 (1) + CO 2 (2) system for x 2 = 1% Figure 2. Comparison of calculated frost points using present and literature k ij with experimental data (Le and Trebble, 2007) for SVE of CH 4 (1) + CO 2 (2) system for x 2 = 1.91% Figure 3. Comparison of calculated frost points using present and literature k ij with experimental data (Le and Trebble, 2007) for SVE of CH 4 (1) + CO 2 (2) system for x 2 = 2.93%…”

“…The results were compared with the experimental data determined by Le and Trebble (2007). The best fitted binary interaction parameters based on the classical mixing rule of PR-EoS obtained in this work for the calculation of SVE of CH 4 -CO 2 system are presented in Table 1 together with the literature k ij data as comparison.…”

“…The best fitted binary interaction parameters based on the classical mixing rule of PR-EoS obtained in this work for the calculation of SVE of CH 4 -CO 2 system are presented in Table 1 together with the literature k ij data as comparison. The frost points calculated using the binary interaction parameters obtained in this work and using those obtained by ZareNezhad and Eggeman (2006) were compared with the experimental data (Le and Trebble, 2007) as shown in Table 2. As shown in this table, the significant improvement of accuracy was found for CO 2 concentration of 1% by reducing AAD from (2.18% to 0.26%).…”

CO2 Frost Phenomenon for Binary System of Methane-Carbon Dioxide Mixtures

“…Since this technology has not yet been applied commercially, finding out detailed information regarding the phase behavior of CH 4 -CO 2 mixtures is necessary. Phase equilibrium data of the CH 4 -CO 2 system and the CO 2 frost point in light hydrocarbon systems have been generated by some researchers [7][8][9] and a semi-empirical liquid freezup correlation has been suggested for the CH 4 -CO 2 system based on data published by Mraw, et al [8]. Prediction of CO 2 freezing points for mixtures of CO 2 -CH 4 under cryogenic conditions using the standard Peng-Robinson equation of state [10] was done by ZareNezhad [11] and ZareNezhad and Eggeman [12].…”