Recent Advances on Carbon Molecular Sieve Membranes (CMSMs) and Reactors

Tanco, Margot A. Llosa; Tanaka, David A. Pacheco

doi:10.3390/pr4030029

Cited by 40 publications

(12 citation statements)

References 107 publications

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“…This processing method involves several adjustable parameters that can influence the structure of the polymeric fiber and results in hollow fiber CMSM with different structures and separation performances. Aiming to increase the CMSM pore volume, pore size and surface area, composite materials have been developed [32,33]. A composite Carbon Molecular Sieve Membrane (c-CMSM) is formed by the incorporation of inorganic compounds in the carbon structure [32].…”

Section: Of 33mentioning

confidence: 99%

“…Aiming to increase the CMSM pore volume, pore size and surface area, composite materials have been developed [32,33]. A composite Carbon Molecular Sieve Membrane (c-CMSM) is formed by the incorporation of inorganic compounds in the carbon structure [32]. The inorganic compounds that are used in the polymeric precursor must have an affinity with the matrix.…”

Section: Of 33mentioning

confidence: 99%

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Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

2020

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In the field of gas separation and purification, membrane technologies compete with conventional purification processes on the basis of technical, economic and environmental factors. In this context, there is a growing interest in the development of carbon molecular sieve membranes (CMSM) due to their higher permeability and selectivity and higher stability in corrosive and high temperature environments. However, the industrial use of CMSM has been thus far hindered mostly by their relative instability in the presence of water vapor, present in a large number of process streams, as well as by the high cost of polymeric precursors such as polyimide. In this context, cellulosic precursors appear as very promising alternatives, especially targeting the production of CMSM for the separation of O2/N2 and CO2/CH4. For these two gas separations, cellulose-based CMSM have demonstrated performances well above the Robeson upper bound and above the performance of CMSM based on other polymeric precursors. Furthermore, cellulose is an inexpensive bio-renewable feed-stock highly abundant on Earth. This article reviews the major fabrication aspects of cellulose-based CMSM. Additionally, this article suggests a new tool to characterize the membrane performance, the Robeson Index. The Robeson Index, θ, is the ratio between the actual selectivity at the Robeson plot and the corresponding selectivity—for the same permeability—of the Robeson upper bound; the Robeson Index measures how far the actual point is from the upper bound.

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Section: Of 33mentioning

confidence: 99%

Section: Of 33mentioning

confidence: 99%

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

2020

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“…The pore diameters can be significantly different from characteristic sizes of molecules that must be separated. CMS materials can be fragile and it may be difficult to scale-up the production process [59,64].…”

Section: Cmsmentioning

confidence: 99%

A Bibliometric Survey of Paraffin/Olefin Separation Using Membranes

et al. 2019

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Bibliometric studies allow to collect, organize and process information that can be used to guide the development of research and innovation and to provide basis for decision-making. Paraffin/olefin separations constitute an important industrial issue because cryogenic separation methods are frequently needed in industrial sites and are very expensive. As a consequence, the use of membrane separation processes has been extensively encouraged and has become an attractive alternative for commercial separation processes, as this may lead to reduction of production costs, equipment size, energy consumption and waste generation. For these reasons, a bibliometric survey of paraffin/olefin membrane separation processes is carried out in the present study in order to evaluate the maturity of the technology for this specific application. Although different studies have proposed the use of distinct alternatives for olefin/paraffin separations, the present work makes clear that consensus has yet to be reached among researchers and technicians regarding the specific membranes and operation conditions that will make these processes scalable for large-scale commercial applications.

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“…Polyimide (PI) could be transformed into carbon materials after pyrolysis. As compared with polymer membranes, carbon molecular sieve membranes (CMSMs) exhibit considerable advantages in gas separation performance and could easily break through the trade-off boundary limit [ 1 , 5 , 6 , 7 ]. The superior performances of CMSMs are ascribed to their unique rigid dual-channel structures.…”

Section: Introductionmentioning

confidence: 99%

The Phase Structural Evolution and Gas Separation Performances of Cellulose Acetate/Polyimide Composite Membrane from Polymer to Carbon Stage

Zhao

et al. 2021

Membranes

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Blending and heat-treatment play significant roles in adjusting gas separation performances of membranes, especially for incorporating thermally labile polymers into carbon molecular sieve membranes (CMSMs). In this work, cellulose acetate (CA) is introduced into polyimide (PI) as a sacrificial phase to adjust the structure and gas separation performance from polymer to carbon. A novel result is observed that the gas permeability is reduced, even when the immiscible CA phase decomposes and forms pores after heat treatment at 350 °C. After carbonization at 600 °C, the miscible CA has changed without contribution, while the role of the immiscible CA phase has changed from original hindrance to facilitation, the composite-based CMSM at a CA content of 10 wt.% shows highest performances, a H2 permeability of ~5300 Barrer (56% enhancement) with a similar H2/N2 permselectivity of 42. The structural analyses reveal that the chain interactions and phase separation behaviors between CA and PI play critical roles on membrane structures and gas diffusion, and the corresponding phase structural evolutions during heat treatment and carbonization determine gas separation properties.

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Recent Advances on Carbon Molecular Sieve Membranes (CMSMs) and Reactors

Cited by 40 publications

References 107 publications

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

Cellulose-Based Carbon Molecular Sieve Membranes for Gas Separation: A Review

A Bibliometric Survey of Paraffin/Olefin Separation Using Membranes

The Phase Structural Evolution and Gas Separation Performances of Cellulose Acetate/Polyimide Composite Membrane from Polymer to Carbon Stage

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