Modelling of the pressure swing air seperation process

Fernandez, Gonzalo; Kenney, C.N.

doi:10.1016/0009-2509(83)80002-5

Cited by 79 publications

(20 citation statements)

References 6 publications

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“…Concerning simple cycles, a well-stirred cell local equilibrium model has been used by Fernandez and Kenney (1983) to describe the three-step one-column PSA separation of air on a molecular sieve adsorbent, and agreement of the model with experiments was found for long cycle times. Cheng and Hill (1985) developed a modified well-stirred cell local equilibrium model, which includes effects of the unpacked "dead volumes" at the column ends, to simulate the separation performance of a helium and methane mixture by the three-step one-column process.…”

Section: Alche Journal September 1993mentioning

confidence: 98%

Simulation of a three‐step one‐column pressure swing adsorption process

Loureiro

Rodrigues

et al. 1993

AIChE Journal

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Separation of a binary mixture by a three-step one-column pressure swing adsorption process in isothermal and adiabatic cases has been studied. The separation performance of the process is characterized by three parameters: enrichment, recovery and productivity. It has been compared at various operating conditions. The evolution of the bed performance from cycle to cycle and the bed dynamics at cyclic steady state have also been addressed.

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Section: Alche Journal September 1993mentioning

confidence: 98%

Simulation of a three‐step one‐column pressure swing adsorption process

Loureiro

Rodrigues

et al. 1993

AIChE Journal

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“…Fernandez and Kenney [9] have proposed two equi-librium models, one using linear isotherms for each component with another using a linear isotherm for oxygen and a Langmuir isotherm for nitrogen. Farooq et al [10] and Ruthven and Farooq [11] modeled the experimental system using a linear driving force (LDF) approximation for intraparticle mass transfer and a bicomponent Langmuir isotherm.…”

Section: Introductionmentioning

confidence: 99%

Predictive Dynamic Model of Air Separation by Pressure Swing Adsorption

Ahari¹,

Pakseresht²,

Mahdyarfar³

et al. 2006

Chem Eng & Technol

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A general dynamic model is developed for separation of air over a carbon molecular sieve and a zeolite adsorbent for production of nitrogen and oxygen. The proposed model is validated using experimental data from working laboratory scale N 2 -PSA and laboratory scale O 2 -PSA systems. Simulations studies are performed to investigate the effect of changing various process variables, such as the duration of PSA steps, bed length and feed inlet velocity.

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“…Most of the PSA models are based on the simplest equilibrium theory, which includes models by: Shendalman and Mitchell (1972), Weaver and Hamrin (1974). Fernandez and Kenney (1983), Chan et al (1981),Chengand Hill (1983, Nataraj and Wankat (1982) for PSA, and by Turnock and Kadlec (1971) for a single-column PSA process. For the air-drying PSA process, the models by Chihara and Suzuki (1983), and Carter and Wyszynski (1983) have accounted for the mass transfer rates in porous sorbent by using the linear driving force approximation.…”

Section: Introductionmentioning

confidence: 99%

Bulk separation of multicomponent gas mixtures by pressure swing adsorption: Pore/surface diffusion and equilibrium models

1986

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A theoretical and experimental study is performed for the bulk separation of a ternary mixture by pressure swing adsorption. Three concentrated products can be obtained by cycling the pressure in the adsorber. Three models are formulated for the cyclic process: equilibrium, Knudsen diffusion, and Knudsen plus surface diffusion. The latter model provides the best results when compared with the experimental data, due to the important contribution of surface flux to the total flux in the sorbent pores. SCOPEAn increasing number of commercial applications are being discovered for pressure swing adsorption (PSA) because of its low energy requirements and costs. The applications are, however, somewhat limited to gas purification processes, with the only bulk separation being for 0, or N, from air. Multicomponent bulk separation by PSA using one sorbent and a single PSA unit, despite its promising commercial value, has not appeared in the literature. In this study, an H,/CH,/ CO, mixture (one-third each by volume) is separated by PSA using activated carbon and involving five basic cyclic steps: I repressurization, I 1 adsorption, 111 cocurrent depressurization, IV countercurrent blowdown, and V purge. Following the order of increasing adsorption strength, H, is produced in step II and in the early stage of step 111. The later cut in step 111 yields CH,, and steps IV and V produce CO, . A basic understanding of the cyclic process is obtained by modeling. Three models are formulated and compared with experimental results: equilibrium model, Knudsen diffusion model, and Knudsen plus surface diffusion model. CONCLUSIONS AND SIGNIFICANCEBulk separation of the ternary mixture H,/CH,/CO, is accomplished by PSA using a single sorbent. Highpurity products of H, and CH, are obtained, whereas the product purity for CO, only reaches 60% due to the low selectivity between CO, I CH, on activated carbon. Of the three models for the cyclic process, the Knudsen plus surface diffusion model provides the best results when compared to the experimental data. Due to the high surface coverage, surface diffusion significantly contributes to the total flux in the sorbent pores, generally over 50% in the PSA process. Accounting for the strong dependence of surface diffusivity on surface coverage, the effects of purge/feed ratio, pressure ratio, feed rate, and end pressure of depressurization on the separation are predictable by the model. A basic understanding of the bed dynamics also is presented.

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Modelling of the pressure swing air seperation process

Cited by 79 publications

References 6 publications

Simulation of a three‐step one‐column pressure swing adsorption process

Simulation of a three‐step one‐column pressure swing adsorption process

Predictive Dynamic Model of Air Separation by Pressure Swing Adsorption

Bulk separation of multicomponent gas mixtures by pressure swing adsorption: Pore/surface diffusion and equilibrium models

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