Predictive Dynamic Model of Air Separation by Pressure Swing Adsorption

Ahari, Jafar Sadeghzadeh; Pakseresht, Saeed; Mahdyarfar, Mohammad; Shokri, Saeed; Zamani, Yahya; Pour, Ali Nakhaei; Naderi, Fahimeh

doi:10.1002/ceat.200500226

Cited by 14 publications

(7 citation statements)

References 11 publications

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“…The low average purity of O 2 is due to the rapid fall in O 2 com-take place, both product purity and recovery go down. This trend is similar to the results reported earlier 11,12 . As discussed earlier, the bed gets saturated in 40 s during adsorption; therefore, a cycle time more than 200 s (5 times the adsorption duration) will bring the average purity below maximum achievable.…”

Section: Cycle Timesupporting

confidence: 93%

“…The trends of purity and recovery in Figure 6 through Figure 10 show a similar trend to those reported earlier 11,12 ; however, Figure 6(b) shows a different trend as the feed rate was not kept constant in the reported study while studying the effect of adsorption pressure. In Figure 8(b), the trend for the effect of adsorption duration on recovery is also not similar to that reported by Huang et al…”

Section: Product Flow Ratesupporting

confidence: 79%

“…Initial conditions: saturated bed (11) Equations (1) to (11) were rearranged and rewritten using central finite difference. A program 'PSASOL' was written in MATLAB ® to solve these simultaneous equations.…”

Section: Assumptionsmentioning

confidence: 99%

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Parametric studies and simulation of PSA process for oxygen production from air

Beeyani

Singh

Vyas

et al. 2010

Polish Journal of Chemical Technology

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A numerical simulation and parametric studies for the separation of air using 5A zeolite for the production of oxygen are presented for a basic two bed pressure swing adsorption (PSA) process. The simulation is based on an in-house program 'PSASOL' developed in MATLAB ® . The transient process of PSA has been described by a set of partial differential equations, which were solved using a finite difference method. Simulation results have been validated with the experimental data from literature. Based on the simulation results, an optimal set of operational parameter values has been obtained for the PSA bed. The values of the optimal parameters, viz. adsorption pressure, cycle time, feed rate, and product rate have been found to be 2.5 atm, 150 s, 15 cm 3 /s, and 2.55 cm 3 /s, respectively. For the optimal conditions, purity of 95.45% and recovery of 77.3% have been achieved. It has also been found that a longer tubular unit with the length to diameter (L/D) ratio of 10.5 is advantageous. The estimated pressure drop across the bed has been found to be negligible. Power consumption and productivity have also been computed.

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Section: Cycle Timesupporting

confidence: 93%

Section: Product Flow Ratesupporting

confidence: 79%

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Parametric studies and simulation of PSA process for oxygen production from air

Beeyani

Singh

Vyas

et al. 2010

Polish Journal of Chemical Technology

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“…For separation of liquid-liquid mixtures, the most common technology is still distillation [1,2]. Distillation is an energy intensive method, especially for close-boiling separations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a novel configuration of bottom flashing on dual distillation columns for saving energy

et al. 2017

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Vapor recompression and bottom flashing are among the developed technologies for enhancing energy efficiency of distillation processes. In this paper, a novel configuration of bottom flashing system is proposed for enhancing energy efficiency of dual columns such as direct distillation sequences. The system is designed to operate between two distillation columns. The proposed system engages two separate distillation columns, both of which can be wide boiling systems. The system incorporates two interacting bottom flashing systems that engage the two distillation columns through heat transfer from the top product of the second column to the bottom product of the first column which in turn results in elimination/reduction of utility requirements of condenser of the second column along with reboiler of the first column. Based on the results of this study, compared to conventional direct sequence distillation, 40.3% reduction in energy requirements and 20.7% reduction total annual costs of the process can be obtained through application of the proposed system.

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“…PSA is attractive because it does not require separate adsorption steps that need heat input. However, it is difficult to yield oxygen and nitrogen simultaneously [1], and to produce high-purity oxygen by the PSA method due to the similar absorption properties of O 2 and Ar on zeolite adsorbents. So, PSA is often used for small tonnage production.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Behavior Analyses of Internal Thermally Coupled Air Separation Columns

Yan

Liu

2011

Chem Eng & Technol

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The internal thermally coupled air separation column (ITCASC) is a frontier of air separation energy savings research. The first principles model of the ITCASC is proposed and is based on the material balance, energy balance, and the related thermal coupling relationship which can be used for further control and design studies. The related solution procedures are given. Detailed behavior analyses are carried out. The research results reveal that the ITCASC process has the perfect separation effect and exhibits different behaviors compared to the conventional air separation column (CASC). The optimization model and the related operation optimization are further explored to gain insight on the energy saving potential of the ITCASC process. Optimization research results show that the ITCASC has about 47 % energy saving potential compared to the CASC process.

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Predictive Dynamic Model of Air Separation by Pressure Swing Adsorption

Cited by 14 publications

References 11 publications

Parametric studies and simulation of PSA process for oxygen production from air

Parametric studies and simulation of PSA process for oxygen production from air

Evaluation of a novel configuration of bottom flashing on dual distillation columns for saving energy

Modeling and Behavior Analyses of Internal Thermally Coupled Air Separation Columns

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