New results on the semidiscrete Boltzmann equation for a binary gas mixture

Polysulfone membranes exhibit resistance to high temperature with low manufacturing cost and high efficiency in the separation process. The composition of gases is an important step that estimates the efficiency of separation in membranes. As membrane types are currently becoming in demand for CO2/CH4 segregation, polysulfone will be an advantageous alternative to have in further studies. Therefore, research is undertaken in this study to evaluate two solvents: chloroform (CF) and tetrahydrofuran (THF). These solvents are tested for casting polymeric membranes from polysulfone (PSF) to separate every single component from a binary gas mixture of CO2/CH4. In addition, the effect of gas pressure was conducted from 1 to 10 bar on the behavior of the permeability and selectivity. The results refer to the fact that the maximum permeability of CO2 and CH4 for THF is 62.32 and 2.06 barrer at 1 and 2 bars, respectively. Further, the maximum permeability of CF is 57.59 and 2.12 barrer at 1 and 2 bars, respectively. The outcome selectivity values are 48 and 36 for THF and CF at 1 bar, accordingly. Furthermore, the study declares that with the increase in pressure, the permeability and selectivity values drop for CF and THF. The performance for polysulfone (PSF) membrane that is manufactured with THF is superior to that of CF relative to the Robeson upper bound. Therefore, through the results, it can be deduced that the solvent during in-situ synthesis has a significant influence on the gas separation of a binary mixture of CO2/CH4.

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Asymptotic-preserving Boltzmann model equations for binary gas mixture

Physical Review E ◽

10.1103/physreve.93.023102 ◽

2016 ◽

Vol 93 (2) ◽

Cited By ~ 2

Author(s):

Sha Liu ◽

Yihua Liang

Keyword(s):

Gas Mixture ◽

Asymptotic Preserving ◽

Binary Gas Mixture ◽

Model Equations ◽

Boltzmann Model

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Simulation of a two-dimensional binary gas mixture outflow into vacuum through a thin slit on the basis of direct solution of the Boltzmann kinetic equation

Journal of Physics Conference Series ◽

10.1088/1742-6596/2056/1/012007 ◽

2021 ◽

Vol 2056 (1) ◽

pp. 012007

Author(s):

S S Sitnikov ◽

F G Tcheremissine ◽

T A Sazykina

Keyword(s):

Kinetic Equation ◽

Boltzmann Kinetic Equation ◽

Gas Mixture ◽

Two Dimensional ◽

Direct Solution ◽

Steady State Regime ◽

Collision Integrals ◽

Flow Formation ◽

Binary Gas Mixture ◽

State Regime

Abstract Two-dimensional binary gas mixture outflow from a vessel into vacuum through a thin slit is studied on the basis of direct solution of the Boltzmann kinetic equation. For evaluation of collision integrals in the Boltzmann equation a conservative projection method is used. Numerical simulation of a two-dimensional argon-neon gas mixture outflow from a vessel into vacuum was performed. Graphs of mixture components flow rate dependence on time during the flow formation, as well as fields of molecular density and temperature for steady-state regime, were obtained.

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