Analysis of gas sorption in glassy polymers with the GAB model: An alternative to the dual mode sorption model

2014 ◽  
Vol 52 (22) ◽  
pp. 1490-1495 ◽  
Author(s):  
Ondřej Vopička ◽  
Karel Friess
Keyword(s):  
Glassy Polymers ◽  
Gas Sorption ◽  
Dual Mode ◽  
Sorption Model ◽  
Gab Model

scholarly journals Modelling Mixed-Gas Sorption in Glassy Polymers for CO2 Removal: A Sensitivity Analysis of the Dual Mode Sorption Model

Membranes ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 8 ◽  
Author(s):  
Eleonora Ricci ◽  
Maria De Angelis
Keyword(s):  
Experimental Data ◽  
Sensitivity Analysis ◽  
Sorption Isotherms ◽  
Experimental Tests ◽  
Glassy Polymers ◽  
Co2 Removal ◽  
Gas Sorption ◽  
Mixed Gas ◽  
Dual Mode ◽  
Wide Range

In an effort to reduce the experimental tests required to characterize the mixed-gas solubility and solubility-selectivity of materials for membrane separation processes, there is a need for reliable models which involve a minimum number of adjustable parameters. In this work, the ability of the Dual Mode Sorption (DMS) model to represent the sorption of CO2/CH4 mixtures in three high free volume glassy polymers, poly(trimethylsilyl propyne) (PTMSP), the first reported polymer of intrinsic microporosity (PIM-1) and tetrazole-modified PIM-1 (TZ-PIM), was tested. The sorption of gas mixtures in these materials suitable for CO2 separation has been characterized experimentally in previous works, which showed that these systems exhibit rather marked deviations from the ideal pure-gas behavior, especially due to competitive effects. The accuracy of the DMS model in representing the non-idealities that arise during mixed-gas sorption was assessed in a wide range of temperatures, pressures and compositions, by comparing with the experimental results available. Using the parameters obtained from the best fit of pure-gas sorption isotherms, the agreement between the mixed-gas calculations and the experimental data varied greatly in the different cases inspected, especially in the case of CH4 absorbed in mixed-gas conditions. A sensitivity analysis revealed that pure-gas data can be represented with the same accuracy by several different parameter sets, which, however, yield markedly different mixed-gas predictions, that, in some cases, agree with the experimental data only qualitatively. However, the multicomponent calculations with the DMS model yield more reliable results than the use of pure-gas data in the estimation of the solubility-selectivity of the material.

Energetics of gas sorption in glassy polymers

Polymer ◽  
1979 ◽  
Vol 20 (8) ◽  
pp. 956-960 ◽  
Author(s):  
W.J Koros ◽  
D.R Paul ◽  
G.S Huvard
Keyword(s):  
Glassy Polymers ◽  
Gas Sorption

Water sorption in Nafion® membranes analyzed with an improved dual-mode sorption model—Structure/property relationships

2013 ◽  
Vol 439 ◽  
pp. 1-11 ◽  
Author(s):  
Yongli Li ◽  
Quang Trong Nguyen ◽  
Camille Lixon Buquet ◽  
Dominique Langevin ◽  
Marc Legras ◽  
...  
Keyword(s):  
Water Sorption ◽  
Model Structure ◽  
Structure Property ◽  
Dual Mode ◽  
Sorption Model ◽  
Structure Property Relationships
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