Adsorption rate on molecular sieving carbon by chromatography

Chihara, Kazuyuki; Suzuki, Motoyuki; Kawazoe, Kunitaro

doi:10.1002/aic.690240212

Cited by 122 publications

(65 citation statements)

References 25 publications

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“…Information about the adsorption equilibrium of the different species is vital to design and model adsorption processes [19][20][21][22][23][24][25][26][27]. The time required to achieve the equilibrium state may be also important, particularly when the size of the pores of the adsorbent are close to the size of the molecules to be separated [28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”

Section: Introductionmentioning

confidence: 99%

Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

186

108

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Pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in other areas like methane purification from natural and biogas and has a tremendous potential to expand its utilization. It is known that the adsorbent material employed in a PSA process is extremely important in defining its properties, but it has also been demonstrated that process engineering can improve the performance of PSA units significantly. This paper aims to provide an overview of the fundamentals of PSA process while focusing specifically on different innovative engineering approaches that contributed to continuous improvement of PSA performance.

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Section: Introductionmentioning

confidence: 99%

Advances in Pressure Swing Adsorption for Gas Separation

Grande

2012

ISRN Chemical Engineering

186

108

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“…This correlation was suggested for rough estimation of the reciprocal diffusion time constant of a given gas by estimating the K value only. Linear relations were obtained between activation energies of diffusion in micropore and isosteric heats of adsorption for several gases for molecular sieve carbons by Chihara et al [81]. In the pores for which the diameter is comparable to that of the diffusing molecule, the diffusing molecules cannot escape from the force field of the pore walls.…”

Section: T ( C) Mass Transfer Resistances (S)mentioning

confidence: 99%

Adsorption of NO in clinoptilolite-rich zeolitic mineral by concentration pulse chromatography method

Narin

Ülkü

2016

Microporous and Mesoporous Materials

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a b s t r a c tThe equilibrium and kinetic parameters for NO adsorption in a clinoptilolite-rich natural zeolitic material from Turkey were determined using the concentration pulse chromatography method. Under the experimental conditions (carrier gas velocities and adsorption temperatures) the micropore diffusion resistance was found to be the mass transfer controlling step. Matching the first moment of the response peaks to the mathematical model the Henry's Law constants and heat of adsorption at zero loading were determined. The axial dispersion, external film, macropore and micropore diffusion coefficients, and activation energy for diffusion of NO in the micropores were calculated from the analysis of the second moments of the response peaks. For successive NO pulses without regeneration between the pulses, the retention times of the response peaks decreased and peak areas increased with the injection number indicating irreversible adsorption. The reversibly adsorbed NO could be desorbed by purging with an inert gas at the adsorption pressure and temperature. Temperature programmed desorption profile obtained by heating the NO saturated adsorbent to 400 C under inert flow revealed presence of multiple irreversibly adsorbed species in NZ with different thermal stabilities. Desorption of these species was not achieved during the heating up to 400 C which makes the natural zeolitic materıal suitable for NO storage rather than for cyclic adsorptive separation processes.

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“…Much of the literature published in this area was devoted only to adsorbent characterization. Most of the works dealt with zeolites and π-complexation adsorbents [2][3] and only a few with carbonaceous materials but activated carbons [4] and CMS [5][6] had poor selectivity towards propylene. We have previously published adsorption equilibrium and kinetics of pure gases onto CMS 4A from Takeda [7].…”

Section: Introductionmentioning

confidence: 99%

“…This separation is practiced by cryogenic distillation when large flowrates are available and helium can be obtained as a byproduct. In this topic much of the literature was also concerned with adsorbent characterization [3,5,[9][10][11] but more works can be found specifically on PSA processes using carbon molecular sieves [12][13]. In these works, poor purity was obtained because the feed has high nitrogen molar fractions (>40%) for landfill gas applications.…”

Section: Introductionmentioning

confidence: 99%

Carbon Molecular Sieves for Hydrocarbon Separations by Adsorption

Grande

Cavenati

Silva

et al. 2005

Ind. Eng. Chem. Res.

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The use of vacuum pressure swing adsorption (VSA-PSA) with carbon molecular sieves (CMS) as selective sorbents is evaluated as an alternative technology for methane−nitrogen and propane−propylene separations. The larger molecules, methane and propane, are very low-diffusing species, resulting in processes where nitrogen and propylene are retained in the bed. For the methane−nitrogen separation, a Skarstrom cycle (pressurization, feed, blowdown, and purge) was used with the advantage of recovering methane in the feed step with a low-pressure drop. At ambient temperature, from a mixture with 20% of nitrogen balanced by methane, a purity >93% was obtained. For the propane−propylene mixture, a five-step cycle was usedpressurization, feed, rinse, intermediate depressurization, and countercurrent blowdownwhere purified propylene is obtained as a low-pressure product. Starting with an equimolar mixture at 373 K, the purity of propylene was 83% with a product recovery of 84%.

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Adsorption rate on molecular sieving carbon by chromatography

Cited by 122 publications

References 25 publications

Advances in Pressure Swing Adsorption for Gas Separation

Advances in Pressure Swing Adsorption for Gas Separation

Adsorption of NO in clinoptilolite-rich zeolitic mineral by concentration pulse chromatography method

Carbon Molecular Sieves for Hydrocarbon Separations by Adsorption

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