scholarly journals Membrane separation study for methane-hydrogen gas mixtures by molecular simulations

2017 ◽  
Vol 20 (2) ◽  
pp. 23002 ◽  
Author(s):  
Kovács ◽  
Papp ◽  
Kristóf
Keyword(s):  
Membrane Separation ◽  
Molecular Simulations ◽  
Gas Mixtures ◽  
Hydrogen Gas

scholarly journals Molecular Simulations of CO2/CH4, CO2/N2 and N2/CH4 Binary Mixed Hydrates

2021 ◽  
Vol 83 (3) ◽  
pp. 372-378
Author(s):  
A. A. Sizova ◽  
S. A. Grintsevich ◽  
M. A. Kochurin ◽  
V. V. Sizov ◽  
E. N. Brodskaya
Keyword(s):  
Carbon Dioxide ◽  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Gas Hydrates ◽  
Molecular Simulations ◽  
Gas Mixtures ◽  
Gas Mixture ◽  
Grand Canonical Monte Carlo ◽  
Multicomponent Gas ◽  
Grand Canonical

Abstract Grand canonical Monte Carlo simulations were performed to study the occupancy of structure I multicomponent gas hydrates by CO2/CH4, CO2/N2, and N2/CH4 binary gas mixtures with various compositions at a temperature of 270 K and pressures up to 70 atm. The presence of nitrogen in the gas mixture allows for an increase of both the hydrate framework selectivity to CO2 and the amount of carbon dioxide encapsulated in hydrate cages, as compared to the CO2/CH4 hydrate. Despite the selectivity to CH4 molecules demonstrated by N2/CH4 hydrate, nitrogen can compete with methane if the gas mixture contains at least 70% of N2.

scholarly journals Modification of Poly(4-methyl-2-pentyne) in the Supercritical Fluid Medium for Selective Membrane Separation of CO2 from Various Gas Mixtures

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2468
Author(s):  
Viktoriya Polevaya ◽  
Anton Vorobei ◽  
Andrey Gavrikov ◽  
Samira Matson ◽  
Olga Parenago ◽  
...  
Keyword(s):  
Membrane Separation ◽  
Gas Permeability ◽  
Gas Mixtures ◽  
Fluid Medium ◽  
Selective Membrane ◽  
Separation Of Co2 ◽  
Reaction Media ◽  
First Time ◽  
Principal Possibility

The modification of highly permeable films of brominated 1,2-disubstituted polyacetylene, poly(4-methyl-2-penthyne), via incorporation of in situ formed butylimidazolium bromide is reported for the first time. Principal possibility and efficiency of supercritical CO2 and CHF3 use as reaction media for the corresponding process, namely for quaternization of butylimidazole by brominated polymer are revealed. As a result, we prepared new membrane materials possessing promising properties such as stability toward organic solvents, good mechanical properties and significantly improved CO2-selectivity while maintaining gas permeability at high values. Comparative analysis of the results allowed us to determine content and conditions for the incorporation of butylimidazolium groups optimal for most efficient separation of CO2 from industrial gas mixtures. These results are of interest for the designing of new CO2 selective membranes.

Influence of Electrode Argon-Hydrogen Co-Injection on Carbon Content in a Alternating Current Ladle Furnace

2011 ◽  
Vol 239-242 ◽  
pp. 2361-2364
Author(s):  
Dong Ping Zhan ◽  
Hui Shu Zhang ◽  
Zhou Hua Jiang ◽  
Wei Gong ◽  
Zhao Ping Chen
Keyword(s):  
Reaction Rate ◽  
Local Equilibrium ◽  
Low Carbon Steel ◽  
Alternating Current ◽  
Gas Mixtures ◽  
Electric Arc ◽  
Hydrogen Gas ◽  
Ladle Furnace ◽  
Low Carbon ◽  
Decarburization Rate

About 80 kg low carbon steel was refined in a multifunction ladle furnace (AC-LF) with alternating current supplying. The argon-hydrogen gas mixtures were injected into the electric arc zone through one hollow graphite electrode. The flow rate of the gas mixtures was 3 m3/h. Results of the tests and the calculation based on the plasma local equilibrium thermodynamics and metallurgical thermodynamics theories show that, when the argon-hydrogen gas mixtures are injected into the electric arc zone, the carburetion rate is 4.7×10-6per minute for the steel heated by conventional AC-LF, which is 1.26 and 1.51 times of the heats blown 90%Ar-10%H2and 80%Ar-20%H2, respectively. The carburetion rate is reduced by 20% at least when argon-hydrogen gas mixtures are blown into the furnace. When H2content in the gas mixtures reached 20% from 0, the decarburization rate increased but the total reaction rate decreases by 1.59×10-6per minute.

Theory of Membrane Separation of Binary Gas Mixtures

2004 ◽  
Vol 77 (5) ◽  
pp. 999-1004 ◽  
Author(s):  
V. I. Baikov ◽  
I. Yu. Kostareva ◽  
N. V. Primak
Keyword(s):  
Membrane Separation ◽  
Gas Mixtures
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