Alcohol dehydration by pervaporation using a carbon hollow fiber membrane derived from sulfonated poly(phenylene oxide)

Yoshimune, Miki; Mizoguchi, Keishin; Haraya, Kenji

doi:10.1016/j.memsci.2012.09.017

Cited by 28 publications

(9 citation statements)

References 37 publications

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“…Reactions that occur when the polymer is heated depend on reaction conditions (temperature [23], thermal-soak [24], and atmosphere composition [25,26]), and the nature of the precursor itself [27][28][29]. Pyrolysis of the polymer chains leads to the formation of carbon molecular sieves (CMS) [30][31][32]. CMS membranes have narrower PSDs than polymers and, therefore, better molecular sieving capabilities [33].…”

Section: Introductionmentioning

confidence: 99%

High-performance carbon molecular sieve membranes for ethylene/ethane separation derived from an intrinsically microporous polyimide

Salinas

Litwiller

et al. 2016

Journal of Membrane Science

107

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High-performance carbon molecular sieve membranes for ethylene/ethane separation derived from an intrinsically microporous polyimide, Journal of Membrane Science, http://dx.doi.org/10.1016/j.memsci. 2015.11.013 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractAn intrinsically microporous polymer with hydroxyl functionalities, PIM-6FDA-OH, was used as a precursor for various types of carbon molecular sieve (CMS) membranes for ethylene/ethane separation. The pristine polyimide films were heated under controlled N 2 atmosphere at different stages from 500 to 800 °C. All CMS samples carbonized above 600 °C surpassed the polymeric ethylene/ethane upper bound. Pure-gas selectivity reached 17.5 for the CMS carbonized at 800 °C with an ethylene permeability of about 10 Barrer at 2 bar and 35 °C, becoming the most selective CMS for ethylene/ethane separation reported to date. As expected, gravimetric sorption experiments showed that all CMS membranes had ethylene/ethane solubility selectivities close to 2 one. The permselectivity increased with increasing pyrolysis temperature due to densification of the micropores in the CMS membranes, leading to enhanced diffusivity selectivity. Mixed-gas tests with a binary 50:50 v/v ethylene/ethane feed showed a decrease in selectivity from 14 to 8.3 as the total feed pressure was increased from 4 to 20 bar. The selectivity drop under mixed-gas conditions was attributed to non-ideal effects: (i) Competitive sorption that reduced the permeability of ethylene and (ii) dilation of the CMS that resulted in an increase in the ethane permeability.

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Section: Introductionmentioning

confidence: 99%

High-performance carbon molecular sieve membranes for ethylene/ethane separation derived from an intrinsically microporous polyimide

Salinas

Litwiller

et al. 2016

Journal of Membrane Science

107

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“…1,2 Amorphous carbon membranes are comprised of micropores with a range of several angstroms, which can effectively reject the permeation of relatively large molecules, thereby exhibiting excellent permselectivity. 1 For instance, Yoshimune et al reported exible carbon hollow ber membranes derived from sulfonated poly(phenylene oxide) with an ideal H 2 /N 2 selectivity of 214 and a H 2 permeance of 3.67 Â 10 À8 mol m À2 s À1 Pa À1 at 30 C. 3 The conventional synthesis of amorphous carbon membranes is via the pyrolysis and carbonization of polymeric precursors. 1,2 In this way, to obtain acceptable permeation performance, the synthetic process requires high operating temperatures that are usually well above 500 C.…”

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confidence: 99%

Plasma-enhanced chemical vapor deposition of amorphous carbon molecular sieve membranes for gas separation

et al. 2016

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Amorphous carbon membranes were successfully synthesized onto a SiO 2 -ZrO 2 /a-Al 2 O 3 nanoporous substrate via plasma-enhanced chemical vapor deposition (PECVD) at room temperature. PECVDderived amorphous carbon membranes exhibited molecular sieving properties, showing ideal selectivities of 23 and 1750 for He/N 2 and He/SF 6 , respectively, at 25 C. The membrane maintained high selectivity even at high temperatures as high as 200 C, indicating considerable stability of the plasma-deposited amorphous carbon layer.Membrane-based gas separation is rapidly growing in a number of applications such as hydrogen purication, carbon dioxide capture, oxygen enrichment, and hydrocarbon separation, because of their low energy requirement and low operating cost. In this context, microporous inorganic membranes such as amorphous carbon membranes have recently received considerable attention owing to their unique characteristics such as an advanced thermal stability, anti-corrosive property, solvent resistance, and super-hydrophobicity. 1,2 Amorphous carbon membranes are comprised of micropores with a range of several angstroms, which can effectively reject the permeation of relatively large molecules, thereby exhibiting excellent permselectivity. 1 For instance, Yoshimune et al. reported exible carbon hollow ber membranes derived from sulfonated poly(phenylene oxide) with an ideal H 2 /N 2 selectivity of 214 and a H 2 permeance of 3.67 Â 10 À8 mol m À2 s À1 Pa À1 at 30 C. 3 The conventional synthesis of amorphous carbon membranes is via the pyrolysis and carbonization of polymeric precursors. 1,2 In this way, to obtain acceptable permeation performance, the synthetic process requires high operating temperatures that are usually well above 500 C.Another approach that might be useful for the synthesis of amorphous carbon membranes is the use of plasma-enhanced chemical vapor deposition (PECVD), which is a commonly used technique for the deposition of thin lms. There is growing interest in utilizing PECVD to fabricate inorganic membranes that have the potential for application in molecular separation, since PECVD offers a low processing temperature (as low as room temperature) unlike the conventional methods (typically 500-600 C). 4-8 For instance, Roualdes et al. prepared polysiloxane membranes using organosilicon precursors such as hexamethyldisiloxane (HMDSO) onto cellulose ester substrates and reported that plasma-deposited membranes had higher selectivity than conventional polysiloxane membranes. 4 Kafrouni et al. used hexamethyldisilazane and ammonia as precursors and prepared silicon carbonitride membranes with a He/N 2 selectivity of 50 at 150 C. 5 Moreover, in our previous study, we demonstrated a low-temperature fabrication of organosilica membranes with excellent molecular sieving properties via a 2-step PECVD involving HMDSO/Ar-PECVD followed by HMDSO/O 2 -PECVD. 6,7 The obtained membrane showed remarkable selectivities for He/N 2 and He/SF 6 of 7800 and 27 000, respectively, at 25 C. 7 We also found that such ...

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“…The water molecules will adsorb on the surface and will pass through the membrane by adsorption diffusion mechanism; the pores will be blocked with water and the permeation of less absorbable molecules will be reduced. The structure of CMSMs prepared from polymers containing oxygen groups (such as phenol-formaldehyde [37,51,91], resorcinol-formaldehyde [92,93], sulfonated oxide (SPPO) [94]) carbonized at below 873.15 K still contains oxygen functional groups. In addition, during the carbonization process, the polymer precursor decomposes; gases are released leaving pores with highly reactive carbons.…”

Section: Carbon Molecular Sieve Membrane For Water Separationmentioning

confidence: 99%

“…Haraya and co-workers [94] prepared hollow fibers of SPPO carbonized at 873.15 K; in pervaporation dehydration of larger alcohols such as 2-propanol and 1-butanol; the CMSM displayed superior selectivity to water. The water permeance and ideal selectivity for the water/2-propanol system at 348.15 K were higher than 1.0 × 10 −6 mol·m −2 ·s −1 ·Pa −1 and 10,000 respectively.…”

Section: Carbon Molecular Sieve Membrane For Water Separationmentioning

confidence: 99%

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

Tanco

Tanaka

2016

Processes

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Carbon molecular sieve membranes (CMSMs) are an important alternative for gas separation because of their ease of manufacture, high selectivity due to molecular sieve separation, and high permeance. The integration of separation by membranes and reaction in only one unit lead to a high degree of process integration/intensification, with associated benefits of increased energy, production efficiencies and reduced reactor or catalyst volume. This review focuses on recent advances in carbon molecular sieve membranes and their applications in membrane reactors.

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Alcohol dehydration by pervaporation using a carbon hollow fiber membrane derived from sulfonated poly(phenylene oxide)

Cited by 28 publications

References 37 publications

High-performance carbon molecular sieve membranes for ethylene/ethane separation derived from an intrinsically microporous polyimide

High-performance carbon molecular sieve membranes for ethylene/ethane separation derived from an intrinsically microporous polyimide

Plasma-enhanced chemical vapor deposition of amorphous carbon molecular sieve membranes for gas separation

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

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