Cause and effects of hyperskin features on carbon molecular sieve (CMS) membranes

Sanyal, Oishi; Hicks, Stephanie T.; Bhuwania, Nitesh; Hays, Samuel S.; Kamath, Manjeshwar G.; Karwa, Shweta; Swaidan, Raja; Koros, William J.

doi:10.1016/j.memsci.2018.01.021

Cited by 43 publications

(24 citation statements)

References 17 publications

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“…[16] Dip-coated composite CMS fiber membranes showed high selectivities and attractive CO 2 permeance at higher pyrolysis temperatures.C ompared to monolithic 6FDA:BPDA-DAM CMS,these composite CMS membranes showed much higher permeance and lower selectivities for similar pyrolysis conditions.W ecould match the selectivity of the monolithic CMS with higher pyrolysis temperature,while it seems that the permeance will still be higher than the monolithic CMS.F or instance,1 0% VTMS treated 6FDA: BPDA-DAM CMS obtained from 550 8 8Cs hows 25 for CO 2 / CH 4 selectivity and 360 GPU for CO 2 permeance. [17] A1 0% v-treated monolithic 6FDA: BPDA-DAM at 675 8 8Cgives 100 GPU CO 2 permeance with CO 2 /CH 4 selectivity of 70, which is less than the CMS-800 in this article (166 GPU with selectivity of 87).…”

Section: Angewandte Chemiementioning

confidence: 75%

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

et al. 2019

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Dip coating and pyrolysis processes are used to create multi-layer asymmetric carbon molecular sieve (CMS) hollowf iber membranes with excellent gas separation properties.Coating of an economical engineered support with ahighperformance polyimide to create precursor fibers with adense skin layer reduces material cost by 25-fold compared to monolithic precursors or ceramic supports.C MS permeation results with CO 2 /CH 4 (50:50) mixed gas feed show attractive CO 2 /CH 4 selectivity of 58.8 and CO 2 permeance of 310 GPU at 35 8 8C.

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Section: Angewandte Chemiementioning

confidence: 75%

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

et al. 2019

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“…We could match the selectivity of the monolithic CMS with higher pyrolysis temperature, while it seems that the permeance will still be higher than the monolithic CMS. For instance, 10 % VTMS treated 6FDA: BPDA‐DAM CMS obtained from 550 °C shows 25 for CO 2 /CH 4 selectivity and 360 GPU for CO 2 permeance . A 10 % v‐treated monolithic 6FDA: BPDA‐DAM at 675 °C gives 100 GPU CO 2 permeance with CO 2 /CH 4 selectivity of 70, which is less than the CMS‐800 in this article (166 GPU with selectivity of 87).…”

Section: Figurementioning

confidence: 99%

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

et al. 2019

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View full text Add to dashboard Cite

Dip coating and pyrolysis processes are used to create multi‐layer asymmetric carbon molecular sieve (CMS) hollow fiber membranes with excellent gas separation properties. Coating of an economical engineered support with a high‐performance polyimide to create precursor fibers with a dense skin layer reduces material cost by 25‐fold compared to monolithic precursors or ceramic supports. CMS permeation results with CO2/CH4 (50:50) mixed gas feed show attractive CO2/CH4 selectivity of 58.8 and CO2 permeance of 310 GPU at 35 °C.

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“…However, ULT CMS‐MA0.5 (CO 2 permeance ~1,310 GPU) was only slightly more permeable than ULT CMS‐MA1 (CO 2 permeance ~1,177 GPU). This was likely due to existence of the so‐called “hyperskin” at the outmost region of CMS hollow fiber membrane skin layer . The hyperskin has extremely low permeability, and limits membrane permeance as the membrane skin layer thickness approaches that of the hyperskin.…”

Section: Resultsmentioning

confidence: 99%

Ultra‐thin skin carbon hollow fiber membranes for sustainable molecular separations

2019

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A transformative platform is reported to derive ultra-thin carbon molecular sieve (CMS) hollow fiber membranes from dual-layer precursor hollow fibers with independently tuned skin layer and substrate properties. These ultra-thin CMS hollow fiber membranes show attractive CO 2 /CH 4 separation factors and excellent CO 2 permeances up to~1,400% higher than state-of-the-art asymmetric CMS hollow fiber membranes. They provide a unique combination of permeance and selectivity competitive with zeolite membranes, but with much higher membrane packing density and potentially much lower costs.carbon molecular sieve membranes, hollow fiber membranes, molecular separations, natural gas purification, ultra-thin membranes

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Cause and effects of hyperskin features on carbon molecular sieve (CMS) membranes

Cited by 43 publications

References 17 publications

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

Carbon Molecular Sieve Membrane Preparation by Economical Coating and Pyrolysis of Porous Polymer Hollow Fibers

Ultra‐thin skin carbon hollow fiber membranes for sustainable molecular separations

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