A Review of Numerical Research on the Pressure Swing Adsorption Process

Zhang, Runye; Shen, Yuanhui; Tang, Zilong; Li, Wenbin; Zhang, Donghui

doi:10.3390/pr10050812

Cited by 15 publications

(7 citation statements)

References 81 publications

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“…Even though eq is strictly valid at low pore occupancies. A large number of implementations of intracrystalline diffusion in models for fixed-bed adsorbers ignore the contribution of the off-diagonal elements Γ ij ( i ≠ j ); see the reviews of Shafeeyan, Ben-Masour, Li, and Zhang . The influence of thermodynamic coupling is underscored in this article by a comparison of simulations taking due account of Γ ij ( i ≠ j ) with simulations in which the assumption Γ ij → δ ij is invoked, as is commonly done in Linear Driving Force (LDF) implementations.…”

Section: Transient Mixture Uptakementioning

confidence: 99%

Fundamental Insights into Intracrystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers

Krishna

2024

Chem Bio Eng.

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This article has the objective of elucidating the variety of factors that quantify influences of intracrystalline diffusion on mixture separations in fixed bed devices packed with microporous crystalline adsorbents such as metal-organic frameworks (MOFs) and zeolites. Such diffusional influences may act either synergistically or anti-synergistically to the mixture adsorption equilibrium, providing the ratio of the diffusivities Đ 1 /Đ 2 ≫1. Experimental data on transient mixture uptake inside single crystals display overshoots in the loadings of the more mobile guest species; this overshoot can be quantitatively captured by use of the Maxwell−Stefan (M-S) diffusion formulation that takes proper account of thermodynamic coupling influences; if such thermodynamic influences are ignored, as is done in the Linear Driving Force (LDF) model, overshoots are not realizable. The use of the M-S formulation to simulate transient breakthroughs in fixed bed adsorbers provides a quantitative match with experiments; the match is significantly poorer if thermodynamic coupling effects are ignored. For a fixed bed of length L, packed with adsorbent particles of radius r c and operating with an interstitial gas velocity, v, the diffusional influences are quantified by two separate parameters: (a) diffusional time constant, Đ 1 /r c 2 , and gas−particle contact time L/v. The transient breakthroughs are uniquely dependent on the product (Đ 1 /r c 2 )(L/v); this result is of practical importance for scaling up from small scale laboratory units to large scale industrial units that use different particle sizes, bed dimensions, and gas velocities.

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Section: Transient Mixture Uptakementioning

confidence: 99%

Fundamental Insights into Intracrystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers

Krishna

2024

Chem Bio Eng.

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“…20 Conventional PSA is a proven technology that was commercially deployed for air separation in the 1960s, 21 yet it often suffers from high pressure drop across the adsorption column, making the separation process energy-intensive. 22,23 Similarly, industrial deployment of TSA processes is usually hampered by lengthy cycles (on the order of hours) due to long heating and cooling steps. 24 The opportunities inherent in electrified adsorption processes are underpinned by their potential to accelerate desorption or cooling rate, significantly boosting the overall throughput.…”

Section: ■ the Need For Electrification Of Adsorptive Separationsmentioning

confidence: 99%

“…Conventional PSA is a proven technology that was commercially deployed for air separation in the 1960s, yet it often suffers from high pressure drop across the adsorption column, making the separation process energy-intensive. , Similarly, industrial deployment of TSA processes is usually hampered by lengthy cycles (on the order of hours) due to long heating and cooling steps …”

Section: The Need For Electrification Of Adsorptive Separationsmentioning

confidence: 99%

Challenges and Opportunities in Electrification of Adsorptive Separation Processes

Al Moinee,

Rownaghi,

Rezaei

2024

ACS Energy Lett.

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A global energy transition from fossil-based to renewable-based systems requires advancements in various energy sectors. Current chemical separation processes are quite energy-intensive and require significant advancement to make this transition happen. In the energy transition era, reducing the dependency of separation processes on fossil-based thermal energy seems inevitable for transitioning smoothly and meeting the stringent timelines. In particular, adsorption-based separation processes have the potential to be fully electrified through innovative strategies in developing stimuli-responsive adsorbents and swing processes. In this review, we discuss the recent efforts in electrification of adsorption processes and provide an overview of emerging materials and processes. The challenges associated with electrified adsorption-based separations are discussed in detail, and opportunities to expedite the transition from traditional practices to advanced energy-efficient systems are provided in the end.

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“…One common application of pressure swing adsorption (PSA) air separation technology is as a oxygen concentrator, which directly produces ~93% O 2 from compressed air [1,2]. The oxygen concentrator plays a significant role in medical treatments and oxygen conditioning of indoor environments, due to its advantages of high purity, cost-effective investment and high operational flexibility [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Mass and Heat Transfer of Pressure Swing Adsorption Oxygen Production Process with Small Adsorbent Particles

Sun,

Zhang,

Zhu

et al. 2023

Processes

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Rapid-cycle pressure swing adsorption (PSA) with small adsorbents particles is intended to improve mass transfer rate and productivity. However, the mass transfer mechanisms are changed with reduction of particle size during rapid-cycle adsorption process. A heat and mass transfer model of rapid-cycle PSA air separation process employing small LiLSX zeolite particles is developed and experimentally validated to numerically analyze the effects of mass transfer resistances on the characteristics of cyclic adsorption process. Multicomponent Langmuir model and linear driving force model are employed for characterizing the adsorption equilibrium and kinetic. The results of numerical analysis demonstrate that the dominant mass transfer resistance of small adsorbents particles is a combination of film resistance, axial dispersion effect and macropore diffusion resistance. The oxygen purity, recovery and productivity of the product are overestimated by ~2–4% when the effect of axial dispersion on mass transfer is ignored. As particle size decreases, the front of nitrogen-adsorbed concentration and gas temperature become sharp, which effectively improves the performance. However, the adverse effect of axial dispersion on the mass transfer becomes significant at very small particles conditions. It is nearly identical shapes of nitrogen concentration and gas temperature profiles after adsorption and desorption steps. The profiles are pushed forward near the production end with an increase in bed porosities. The optimal oxygen recovery and productivity are achieved with a particle diameter of 0.45 mm and bed porosity of 0.39 during the PSA process.

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A Review of Numerical Research on the Pressure Swing Adsorption Process

Cited by 15 publications

References 81 publications

Fundamental Insights into Intracrystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers

Fundamental Insights into Intracrystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers

Challenges and Opportunities in Electrification of Adsorptive Separation Processes

Mass and Heat Transfer of Pressure Swing Adsorption Oxygen Production Process with Small Adsorbent Particles

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