Ethylene/ethane permeation, diffusion and gas sorption properties of carbon molecular sieve membranes derived from the prototype ladder polymer of intrinsic microporosity (PIM-1)

Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800°C under inert N2 atmosphere (<2ppm O2). At 400°C, PIM-1 self-cross-linked and developed polar...

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Published inJournal of membrane science Vol. 504; pp. 133 - 140
Main Authors Salinas, Octavio, Ma, Xiaohua, Litwiller, Eric, Pinnau, Ingo
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.04.2016
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Abstract Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800°C under inert N2 atmosphere (<2ppm O2). At 400°C, PIM-1 self-cross-linked and developed polar carbonyl and hydroxyl groups due to partial dioxane splitting in the polymer backbone. Significant degradation occurred at 600°C due to carbonization of PIM-1 and resulted in 30% increase in cumulative surface area compared to its cross-linked predecessor. In addition, PIM-1-based CMS developed smaller ultramicropores with increasing pyrolysis temperature, which enhanced their molecular sieving capability by restricted diffusion of ethylene and ethane through the matrix due to microstructural carbon densification. Consequently, the pure-gas ethylene permeability (measured at 35°C and 2bar) decreased from 1600Barrer for the pristine PIM-1 to 1.3Barrer for the amorphous carbon generated at 800°C, whereas the ethylene/ethane pure-gas selectivity increased significantly from 1.8 to 13. [Display omitted] •First report of ladder PIM-1-derived CMS membranes for ethylene/ethane separation.•PIM-1-derived CMS (pyrolized at 800°C) shows high pure-gas selectivity (αC2H4/C2H6~13).•Ethylene/ethane permselectivity of the CMS membrane is dominated by diffusivity selectivity.•Intrinsic polymer precursor microporosity appears to have influence on CMS gas permeability.
AbstractList Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800 degree C under inert N sub(2) atmosphere (<2 ppm O sub(2)). At 400 degree C, PIM-1 self-cross-linked and developed polar carbonyl and hydroxyl groups due to partial dioxane splitting in the polymer backbone. Significant degradation occurred at 600 degree C due to carbonization of PIM-1 and resulted in 30% increase in cumulative surface area compared to its cross-linked predecessor. In addition, PIM-1-based CMS developed smaller ultramicropores with increasing pyrolysis temperature, which enhanced their molecular sieving capability by restricted diffusion of ethylene and ethane through the matrix due to microstructural carbon densification. Consequently, the pure-gas ethylene permeability (measured at 35 degree C and 2 bar) decreased from 1600 Barrer for the pristine PIM-1 to 1.3 Barrer for the amorphous carbon generated at 800 degree C, whereas the ethylene/ethane pure-gas selectivity increased significantly from 1.8 to 13.
Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800°C under inert N2 atmosphere (<2ppm O2). At 400°C, PIM-1 self-cross-linked and developed polar carbonyl and hydroxyl groups due to partial dioxane splitting in the polymer backbone. Significant degradation occurred at 600°C due to carbonization of PIM-1 and resulted in 30% increase in cumulative surface area compared to its cross-linked predecessor. In addition, PIM-1-based CMS developed smaller ultramicropores with increasing pyrolysis temperature, which enhanced their molecular sieving capability by restricted diffusion of ethylene and ethane through the matrix due to microstructural carbon densification. Consequently, the pure-gas ethylene permeability (measured at 35°C and 2bar) decreased from 1600Barrer for the pristine PIM-1 to 1.3Barrer for the amorphous carbon generated at 800°C, whereas the ethylene/ethane pure-gas selectivity increased significantly from 1.8 to 13. [Display omitted] •First report of ladder PIM-1-derived CMS membranes for ethylene/ethane separation.•PIM-1-derived CMS (pyrolized at 800°C) shows high pure-gas selectivity (αC2H4/C2H6~13).•Ethylene/ethane permselectivity of the CMS membrane is dominated by diffusivity selectivity.•Intrinsic polymer precursor microporosity appears to have influence on CMS gas permeability.
Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation. Pristine PIM-1 films were heated from 400 to 800°C under inert N2 atmosphere (<2ppm O2). At 400°C, PIM-1 self-cross-linked and developed polar carbonyl and hydroxyl groups due to partial dioxane splitting in the polymer backbone. Significant degradation occurred at 600°C due to carbonization of PIM-1 and resulted in 30% increase in cumulative surface area compared to its cross-linked predecessor. In addition, PIM-1-based CMS developed smaller ultramicropores with increasing pyrolysis temperature, which enhanced their molecular sieving capability by restricted diffusion of ethylene and ethane through the matrix due to microstructural carbon densification. Consequently, the pure-gas ethylene permeability (measured at 35°C and 2bar) decreased from 1600Barrer for the pristine PIM-1 to 1.3Barrer for the amorphous carbon generated at 800°C, whereas the ethylene/ethane pure-gas selectivity increased significantly from 1.8 to 13.
Author Pinnau, Ingo
Litwiller, Eric
Salinas, Octavio
Ma, Xiaohua
Author_xml – sequence: 1
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  fullname: Salinas, Octavio
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  givenname: Xiaohua
  surname: Ma
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– sequence: 3
  givenname: Eric
  surname: Litwiller
  fullname: Litwiller, Eric
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  givenname: Ingo
  surname: Pinnau
  fullname: Pinnau, Ingo
  email: ingo.pinnau@kaust.edu.sa
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Keywords PIM-1
Carbon molecular sieve
Intrinsically microporous polymer
Ethylene/ethane separation
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Snippet Fine-tuning the microporosity of PIM-1 by heat treatment was applied to develop a suitable carbon molecular sieve membrane for ethylene/ethane separation....
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SubjectTerms artificial membranes
Carbon
Carbon molecular sieve
carbonization
crosslinking
Diffusion
dioxane
Ethane
Ethylene
Ethylene/ethane separation
heat treatment
Hydroxyl groups
Intrinsically microporous polymer
Membranes
Microporosity
moieties
Molecular sieves
oxygen
permeability
PIM-1
polymers
prototypes
pyrolysis
sieving
sorption
surface area
temperature
Title Ethylene/ethane permeation, diffusion and gas sorption properties of carbon molecular sieve membranes derived from the prototype ladder polymer of intrinsic microporosity (PIM-1)
URI https://dx.doi.org/10.1016/j.memsci.2015.12.052
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https://www.proquest.com/docview/1809634772
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