Generalization of effect of oxygen exposure on formation and performance of carbon molecular sieve membranes

Membrane-based technology has proved its practicality in gas separation through its performance. Various type of membranes has been explored, showing that each type of them have their own advantages and disadvantages. Polymeric membranes have been widely used to separate O2/N2, however, its drawbacks lead to the development of carbon molecular sieve membrane. Carbon molecular sieve membranes have demonstrated excellent separation performance for almost similar kinetic diameter molecules such as O2/N2. Many polymer precursors can be used to produce carbon molecular sieve membrane through carbonization process or also known as heat treatment. This paper discusses the variety of precursors and carbonization parameters to produce high quality and performance of carbon molecular sieve membranes. This paper covers the evaluation in advancement and status of high-performance carbon membrane implemented for separating gas, comprising the variety of precursor materials and the fabrication process that involve many different parameters, also analysis of carbon membranes properties in separating various type of gas having high demand in the industries. The issues regarding the current challenges in developing carbon membrane and approaches with the purpose of solving and improving the performance and applications of carbon membrane are included in this paper. Also, the advantages of the carbon membrane compared to other types of membranes are highlighted. Observation and understanding the variables affecting the quality of membrane encourage the optimization of conditions and techniques in producing high-performance membrane.

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A Review on Polymer Precursors of Carbon Molecular Sieve Membranes for Olefin/Paraffin Separation

Membranes ◽

10.3390/membranes11070482 ◽

2021 ◽

Vol 11 (7) ◽

pp. 482

Author(s):

Seong-Joong Kim ◽

YongSung Kwon ◽

DaeHun Kim ◽

Hosik Park ◽

Young Hoon Cho ◽

...

Keyword(s):

Molecular Sieve ◽

Phenolic Resin ◽

Inorganic Materials ◽

Carbon Molecular Sieve ◽

Future Directions ◽

Polymer Precursors ◽

And Performance ◽

Polymers Of Intrinsic Microporosity ◽

Cryogenic Distillation ◽

Intrinsic Microporosity

Carbon molecular sieve (CMS) membranes have been developed to replace or support energy-intensive cryogenic distillation for olefin/paraffin separation. Olefin and paraffin have similar molecular properties, but can be separated effectively by a CMS membrane with a rigid, slit-like pore structure. A variety of polymer precursors can give rise to different outcomes in terms of the structure and performance of CMS membranes. Herein, for olefin/paraffin separation, the CMS membranes derived from a number of polymer precursors (such as polyimides, phenolic resin, and polymers of intrinsic microporosity, PIM) are introduced, and olefin/paraffin separation properties of those membranes are summarized. The effects from incorporation of inorganic materials into polymer precursors and from a pyrolysis process on the properties of CMS membranes are also reviewed. Finally, the prospects and future directions of CMS membranes for olefin/paraffin separation and aging issues are discussed.

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Effect of processing on carbon molecular sieve structure and performance

Carbon ◽

10.1016/j.carbon.2010.06.036 ◽

2010 ◽

Vol 48 (13) ◽

pp. 3737-3749 ◽

Cited By ~ 11

Author(s):

Mita Das ◽

John D. Perry ◽

William J. Koros

Keyword(s):

Molecular Sieve ◽

Carbon Molecular Sieve ◽

And Performance

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Hyperaging Tuning of a Carbon Molecular‐Sieve Hollow Fiber Membrane with Extraordinary Gas‐Separation Performance and Stability

Angewandte Chemie International Edition ◽

10.1002/anie.201904913 ◽

2019 ◽

Vol 58 (34) ◽

pp. 11700-11703 ◽

Cited By ~ 9

Author(s):

Wulin Qiu ◽

Justin Vaughn ◽

Gongping Liu ◽

Liren Xu ◽

Mark Brayden ◽

...

Keyword(s):

Gas Separation ◽

Hollow Fiber ◽

Molecular Sieve ◽

Hollow Fiber Membrane ◽

Separation Performance ◽

Fiber Membrane ◽

Carbon Molecular Sieve ◽

Gas Separation Performance

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A MEMS µ-Preconcentrator Employing a Carbon Molecular Sieve Membrane for Highly Volatile Organic Compound Sampling

Chemosensors ◽

10.3390/chemosensors9050104 ◽

2021 ◽

Vol 9 (5) ◽

pp. 104

Author(s):

Hung-Yang Kuo ◽

Wei-Riu Cheng ◽

Tzu-Heng Wu ◽

Horn-Jiunn Sheen ◽

Chih-Chia Wang ◽

...

Keyword(s):

Organic Compound ◽

Organic Compounds ◽

Volatile Organic Compound ◽

Molecular Sieve ◽

Amplification Factor ◽

Microfluidic Channel ◽

Carbon Molecular Sieve ◽

Volatile Organic ◽

Chromatographic Peaks ◽

Gaseous Toluene

This paper presents the synthesis and evaluation of a carbon molecular sieve membrane (CMSM) grown inside a MEMS-fabricated μ-preconcentrator for sampling highly volatile organic compounds. An array of µ-pillars measuring 100 µm in diameter and 250 µm in height were fabricated inside a microfluidic channel to increase the attaching surface for the CMSM. The surface area of the CMSM was measured as high as 899 m2/g. A GC peak amplification factor >2 × 104 was demonstrated with gaseous ethyl acetate. Up to 1.4 L of gaseous ethanol at the 100 ppb level could be concentrated without exceeding the capacity of this microchip device. Sharp desorption chromatographic peaks (<3.5 s) were obtained while using this device directly as a GC injector. Less volatile compounds such as gaseous toluene, m-xylene, and mesitylene appeared to be adsorbed strongly on CMSM, showing a memory effect. Sampling parameters such as sample volatilities, sampling capacities, and compound residual issues were empirically determined and discussed.

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