Pore‐diffusion model for cyclic separation: Temperature swing separation of hydrogen and methane at elevated pressures

Abstract

reflux ratio distilling head. Between the Corad head and the top of the column, a feed line from a constant flow bellows pump was introduced. The column had been calibrated with a test mixture of ethylbenzene and p-xylene, whose mixture possesses a relative volatility of 1.06. The column calibrated 4.5 theoretical plates at total reflux. A run was made with a charge comprising approximately 10% methylcyclohexane and 90% toluene in the stillpot. The column was operated at total reflux for about an hour and then the pump started at a rate to deliver about one part of extractive agent to one part of methylcyclohexane-toluene being boiled up. The extractive agent in this example was 33.3% phthalic anhydride, 33.3% maleic anhydride, and 33.3% glycerol triacetate. The following data were obtained: Time, Composition, Composition, Relative hours % MCH, % Tol. % MCH, % Tol. Volatility 1 88.7 11.3 6.4 93.6 2.87 2 97.0 3.0 5.3 94.7 4.11 3 97.8 2.2 4.9 95.1 4.48It will be noted that after about two hours, equilibrium has been achieved and the relative volatility remains essentially constant in the range 4.1 to 4.5. Without the extractive agent it would have been 1.50. Overhead Stillpot LITERATURE CITEDAtlani, M., V. Corn, and C.

Comparison of sorbents and isotherm models for NH3‐gas separation by adsorption

“…The minimum number of independent parameters required to fit nonlinear equilibrium data to the isotherm model with a temperature-dependent parameter is three. This is valid for the Langmuir model: Langmuir 1 1 2 3 Langmuir 2 1 2 and 3 4 Langmuir 3 1 2 and 4 4 Langmuir 4 1 2 and 5 4 Langmuir 5 1 2 and 7 4 Langmuir᎐Freundlich 1 8 2 4 Langmuir᎐Freundlich 2 8 2 and 3 5 Langmuir᎐Freundlich 3 8 2 and 4 5 Langmuir᎐Freundlich 4 8 2 and 5 5 Langmuir᎐Freundlich 5 8 2 and 7 5 Henry 9 2 2 VS-Margules 1 10 2 4 VS-Margules 2 10 2 and 7 5 VS-Wilson 11 2, 7, 12 and 13 7 VS-FH 15 2, 15 and 16 5 Dubinin᎐Astakhov 20 18 3 Ž been used, especially for process simulation models, are Tsai . et al, 1983;Malek and Farooq, 1996;Hwang et Langmuir ᎐ Freundlich Isotherm.…”

Comparison of isotherm models for hydrocarbon adsorption on activated carbon

“…There are also a number of other modified forms of the Langmuir isotherm. Yang and Doong (1985) and Tsai et al (1983) used a form that allows a temperature-dependent saturation coverage. This is generally thought to account for thermal expansion of the adsorbed phase, which results in a decrease in the monolayer coverage at high temperatures.…”

“…However, the exact form of the temperature dependence of saturated surface coverage is not well validated. Tsai et al (1983) used a linear ratio to account for the reduction of saturation capacity, while von Gemmingen (1993) used a liquid-like linear dependence as follows:…”

The Effects of Quartic Term Mathematical Model on The Concentration Profile of Fixed Bed Gas Adsorber

“…Therefore, it is not coincident that many authors have used this approach to a more complex system, see for example (Do and Rice, 1986;Patton et al, 2004;Tsai et al, 1983;Yang et al, 1997;Yang and Doong, 1985) and references therein.…”