Adsorption of Methane, Ethane, and Ethylene Gases and Their Binary and Ternary Mixtures and Carbon Dioxide on Activated Carbon at 212-301 K and Pressures to 35 Atmospheres

Abstract

Adsorption equilibria for methane, ethane, ethylene, and carbon dioxide and for mixtures of these hydrocarbons on activated carbon were measured volumetrically at 212.7, 260.2, and 301.4 K, at pressures up to about 35 atm, for binary gas-phase compositions of about 0.25, 0.50, and 0.75 mole fraction of the first component, and for ternary gas-phase compositions of about 0.60-0.20-0.20, 0.25-0.50-0.25, and 0.20-0.20-0.60 mole fraction of methane, ethane, and ethylene, respectively. A method is proposed for the prediction of multicomponent adsorption equilibria from pure gas adsorption data. This method is based on the Polanyi potential theory of adsorption. It is similar to the predictive method developed by Grant and Manes for binaries. A single correlation or characteristic curve was constructed for all the pure gas adsorption data. A characteristic curve based on all the mixture adsorption data was shown to be essentially superimposable on that of the pure components. This finding permitted a fair estimation of mixture adsorption data from

Rigorous thermodynamic treatment of gas adsorption

“…Experimental results (Reich, et al, 1980) for this point are n, = 4.527 and x, == 0.61 2, which is in poor agreement with both calculations in Table 1. The discrepancy must be due to nonidealities in the adsorbed phase.…”

“…Table 1 summarizes IAS calculations for an imperfect gas compared to approximate results obtained by assuming a perfect gas. Single-gas adsorption isotherms for this system were measured by Reich et al (1980). Errors in the calculated amount adsorbed introduced by assuming a perfect gas are only a few percent, even when fugacity coefficients deviate from unity by 7%.…”

Sequestering Carbon Dioxide in Coalbeds

“…In a pioneering study, Reucroft and coworkers [38,39] had reached a similar conclusion in the case of adsorption of 15 organic vapors on BPL carbon, although Duisterwinkel's recommendation was that "the molecular parachor is to be preferred over the molar polarization" [40].…”

“…In this case, the adsorbed molecule has fluid-solid interactions with two surfaces, or ( (38) where ε fs is the fluid-solid interaction energy parameter and ρ atom = 0.382 A. The molecular diameter of the adsorbate and the carbon interplanar distance are σ ff and σ ss , respectively.…”

Vacancy solution theory for binary adsorption equilibria in heterogeneous carbon

“…pressures up to 35 atomosphere Reich et al, 1980 . For each carbon, all the single adsorption data are fitted simultaneously using a nonlinear least-square procedure to estimate the common parameters n , q, and ␥. Considering ϱ the effect of temperature on the capacity of the adsorbate, Ž .…”