A new permeation model in porous filler–based mixed matrix membranes for CO₂ separation

Abstract

In this paper, a novel comprehensive permeation model for mixed matrix membranes (MMMs) is introduced. This model shows the importance of understanding and developing a more reliable model for the permeation behavior of MMMs containing porous filler nanoparticles. A new method is established to provide a more precise/large‐scale three‐dimensional MMMs geometry. The required number of spherical porous fillers in random/nonuniform positions in the polymer matrix is calculated. Interfacial equilibrium constant (K) at the polymer/filler interfaces was adjusted as the concentration ratio of the diffusing penetrants (C2 and C1) at the interface, respectively. In this case, the K values are changed by varying the intended gaseous concentration due to their permeation through the MMM. Hence, its effect on penetrants effective diffusion coefficient was examined. Then, the obtained results were evaluated with similar experimental data, which showed much consistency. Therefore, the accurate calculation method for MMMs permeability was governed for the entire range of the operating pressures in MMMs. The results showed that the permeability of MMMs increases with increasing filler particle size. On the other hand, variations that occur in the MMM permeability at various particle size were much more distinct at higher loadings. Moreover, some well‐known analytical permeation models were used to compare and validate the model's permeability results. It can be concluded that this model provides a method for more precise and realistic design of MMMs as well as to better construe the large number of related experimental data. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

Promising Performance for Efficient CO2 Separation with the p-tert-Butylcalix[4]arene/Pebax-1657 Mixed Matrix Membrane

“…CO 2 is the most important gas of the earth’s long-lived greenhouse gases, which leads to various problems such as global warming and climate change. − With regard to environmental challenges, various separation technologies are considered as commonly applied methods for CO 2 removal such as distillation and cryogenic technologies. Although these methods have high separation efficiencies, they have some drawbacks such as environmental problems, high energy consumption, numerous complicated operation units, and high investment cost. − Thus, researchers tried to substitute membrane processes for common technologies, covering the hurdles of previous methods . Membrane processes as a novel and economical technology have different advantages, including low installation costs and energy consumption, high efficiency and stability, and simplicity in scale up and process control; hence they have been able to attract the researchers’ attention. , In recent years, the utilization of polymeric membranes has been widely developed to provide sophisticated gas separation units .…”

3D Modelling of Mass Transfer into Bio-Composite

“…In parallel, to overcome the limitations of analytical approaches, some authors have proposed numerical models that attempt to consider the real 3D structure of the composite system and that solve the mass transfer using generally, Finite Element Method (FEM). We can cite, as recent examples in that field, the work of Monsalve-Bravo et al [17] who model the three-dimensional (3-D) transport problem in full-scale mixed-matrix membranes using FEM or the work of Sharifzadeh and co-authors (2019) who simulated gas diffusion behavior in 3D composite filled with permeable spherical particles randomly dispersed [18]. The two aforementioned studies confirmed that the permeability is positively correlated to filler volume fraction and particle size.…”

CO2 separation of a novel Ultem‐based mixed matrix membrane incorporated with Ni2+‐exchanged zeolite X

“…Fossil fuel combustion leads to the release of the excessive extent of CO 2 into the atmosphere. Global warming appears as an outcome of CO 2 emission into the atmosphere because CO 2 as a greenhouse gas traps the heat 1–5 . Different methods can be employed for CO 2 separation depending on various conditions in the flue gas stream, including cryogenic distillation, pressure swing adsorption, absorption, and membrane process 6–11 …”