Preparation and gas permeation properties of carbon molecular sieve membranes based on sulfonated phenolic resin

Zhou, Weiliang; Yoshino, Makoto; Kita, Hidetoshi; Okamoto, Ken‐ichi

doi:10.1016/s0376-7388(03)00074-7

Cited by 56 publications

(36 citation statements)

References 20 publications

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“…A very recent development involves the preparation of carbon-alumina mixed matrix membranes, where the phenolic resin was incorporated into the porous structure of an alumina substrate by a vacuum impregnation, showing that the vacuum time played an important role in the structural formation of the mixed matrix membranes [22]. Phenolic resins have several advantages for the preparation of CMS membranes such as better control of its crosslinking density, molecular weight and pore size by sol-gel chemistry and carbonization process [34][35][36][37]. Other types of polymers as carbon precursors, like polyimide, can also produce high quality CM membranes.…”

Section: Introductionmentioning

confidence: 99%

Vacuum-assisted tailoring of pore structures of phenolic resin derived carbon membranes

Jalil

Wang²,

Yacou

et al. 2017

Journal of Membrane Science

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This work shows the preparation and separation performance assessment of carbon membranes derived from phenolic resin by a vacuum-assisted method and carbonisation in an inert atmosphere.The vacuum time played an important role in tailoring the structure of the membranes. For instance, pore volumes and surface areas increased from 0.81 and 834 to 2.2 cm 3 g -1 and 1910 m 2 g -1 , respectively, as the vacuum time exposure increased from 0 to 1200 s. The significant structural changes correlated very well with water permeation, as fluxes increased by 91% as the vacuum time increased from 0 to 1200s, reaching up to 169 kg m -2 h -1 at 5 bar. Molecular weight cut-off tests showed no rejection for the smaller glucose and sucrose molecules, though this increased to ~ 80% and full rejection for 36kD and 400kD polyvinyl pyrrolidine. Interestingly, FTIR spectra showed that the peaks of C-H stretching vibration (2800-3200 cm -1 ) and C-O stretching (1030 cm -1 ) became more pronounced as a function of increasing vacuum time, strongly suggesting that the use of vacuum further assisted in the polycondensation of phenolic oligomers. Based on these outcomes, a cluster to cluster model is proposed, whereby vacuum application promoted crosslinking reactions of the phenolic resin, creating microporous regions within the clusters, and mesoporous regions between the clusters. 2 Graphical AbstractKeywords: carbon membranes; vacuum-assisted method; water; molecular weight cut-off.

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Section: Introductionmentioning

confidence: 99%

Vacuum-assisted tailoring of pore structures of phenolic resin derived carbon membranes

Jalil

Wang²,

Yacou

et al. 2017

Journal of Membrane Science

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“…This suggests the decomposition of sulfonic acid groups followed by the decomposition of -C(CF 3 ) 2 -groups just before the substantial decomposition of the polyimide backbone significantly enhanced the micropore structure of the resultant pyrolytic layer. Figure 6 shows the comparison of the gas separation performance for the present CMS membranes with that for the CMS membranes reported in the literature (Hayashi et al, 1995;Kusuki et al, 1997;Shiflett and Foley, 1999;Okamoto et al, 1999Okamoto et al, , 2000Fuertes, 1999, 2000;Nishiyama et al, 2003;Yoshino et al, 2003;Zhou et al, 2003). There seems to be a trade-off relationship between the gas selectivity and permeance for every separation system.…”

Section: Measurementsmentioning

confidence: 76%

“…Scanning Electron Microscopy (SEM) was performed using an S2300 (Hitachi, Ltd.). Gas permeation experiments were carried out at 308 K and 1 atm using a vacuum time lag method to determine the gas permeance R [mol/(m 2 s Pa)], and the ideal separation factor as the R ratio (Zhou et al, 2003). Gas permeability coefficients P [mol m/(m 2 s Pa)] for CMS top layers of some composite membranes were calculated on the assumption that gas permeation resistance of support is negligible.…”

Section: Measurementsmentioning

confidence: 99%

“…The increase in the selectivity was higher for the gas pair with a larger difference in molecular size such as H 2 /CH 4 than for the gas pair with a smaller difference in molecular size such as CO 2 /N 2 and O 2 /N 2 . The increase in the gas permeance and the slight increase in the ideal separation factor below 873 K may be due to development of the interpenetrating micropore structure (Zhou et al, 2003). The large decrease in the gas permeance and the increase in the ideal separation factor above 873 K may be due to the shift of the size distribution of micropores to smaller size caused by shrinkage of the membrane structure as a result of further decomposition.…”

Section: Measurementsmentioning

confidence: 99%

“…There are many articles reporting CMS membranes derived from various precursors (Hayashi et al, 1995;Kusuki et al, 1997;Shiflett and Foley, 1999;Fuertes, 1999, 2000;Okamoto et al, 1999Okamoto et al, , 2000Nishiyama et al, 2003;Yoshino et al, 2003;Zhou et al, 2003). We have reported that flat pyrolytic membranes prepared by pyrolyzing 1,4,5,8-naphthalene tetracarboxylic dianhydride (NTDA)-based polyimides with pendant sulfonic acid groups at 723 K displayed higher performance for CO 2 /N 2 and C 3 H 6 /C 3 H 8 separation systems (Islam et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Gas Permeation Properties of Composite Carbon Molecular Sieve Membranes Derived from Polyimides with Thermally Decomposable Sulfonic Acid Salt and/or Hexafluoroisopropylidene Group

Islam

Tanaka

Kita

et al. 2006

J. Chem. Eng. Japan

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Carbon molecular sieve (CMS) membranes were prepared from polyimides with sulfonic acid triethylammonium salt (SO 3 NH(C 2 H 5 ) 3 ) and/or hexafluoroisopropylidene (-C(CF 3 ) 2 -) groups by pyrolyzing precursor composite membranes at the temperatures ranging from 773 to 973 K in an N 2 flow for 1 h. The precursor membranes were prepared by coating the polyimides on ceramic porous support tubes. The sulfonic acid salt and the -C(CF 3 ) 2 -group decomposed in the ranges of 573 to 673 K and 723 to 973 K, respectively. The composite CMS membranes prepared here had a defect-free top layer of 1.5 to 5 µ µ µ µ µm thick. The CMS membrane derived from the polyimide with both the thermally decomposable groups displayed the highest gas permeances. The decomposition of sulfonic acid groups followed by the decomposition of the -C(CF 3 ) 2 -group just before the substantial decomposition of the polyimide backbone seemed to significantly enhance the micropore structure of the resultant pyrolytic layer. Compared to the CMS composite or hollow-fiber membranes reported in the literature, the membranes prepared in this study displayed higher O 2 and CO 2 gas permeances with reasonably high ideal separation factors for O 2 /N 2 and CO 2 /N 2 separations.

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Gas Separation by Carbon Membranes

Williams

Koros

2008

Advanced Membrane Technology and Applications

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Preparation and gas permeation properties of carbon molecular sieve membranes based on sulfonated phenolic resin

Cited by 56 publications

References 20 publications

Vacuum-assisted tailoring of pore structures of phenolic resin derived carbon membranes

Vacuum-assisted tailoring of pore structures of phenolic resin derived carbon membranes

Preparation and Gas Permeation Properties of Composite Carbon Molecular Sieve Membranes Derived from Polyimides with Thermally Decomposable Sulfonic Acid Salt and/or Hexafluoroisopropylidene Group

Gas Separation by Carbon Membranes

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