Pressure swing adsorption reactors: Simulation of three‐step one‐bed process

Lu, Z. P.; Rodrigues, Alírio E.

doi:10.1002/aic.690400705

Cited by 37 publications

(17 citation statements)

References 20 publications

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“…The boundary conditions for the pressurization with feed, feed, counter-current blown and purge with N 2 are shown in Table 3. During the pressurization/depressurization steps, an exponential valve equation type is used following the experimental data (Lu and Rodrigues 1994). …”

Section: Theoreticalmentioning

confidence: 99%

“…All properties in the bulk gas phase, i.e. viscosity, thermal gas conductivity, and molecular diffusion, are calculated with the reference conditions and then corrected locally by temperature and pressure according to Lu and Rodrigues (1994). The boundary conditions for the pressurization with feed, feed, counter-current blown and purge with N 2 are shown in Table 3.…”

Section: Theoreticalmentioning

confidence: 99%

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Capture of CO2 from flue gas by vacuum pressure swing adsorption using activated carbon beads

Shen

et al. 2010

Adsorption

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Vacuum pressure swing adsorption (VPSA) for CO 2 capture has attracted much research effort with the development of the novel CO 2 adsorbent materials. In this work, a new adsorbent, that is, pitch-based activated carbon bead (AC bead), was used to capture CO 2 by VPSA process from flue gas. Adsorption equilibrium and kinetics data had been reported in a previous work. Fixed-bed breakthrough experiments were carried out in order to evaluate the effect of feed flowrate, composition as well as the operating pressure and temperature in the adsorption process. A fourstep Skarstrom-type cycle, including co-current pressurization with feed stream, feed, counter-current blowdown, and counter-current purge with N 2 was employed for CO 2 capture to evaluate the performance of AC beads for CO 2 capture with the feed compositions from 15-50% CO 2 balanced with N 2 . Various operating conditions such as total feed flowrate, feed composition, feed pressure, temperature and vacuum pressure were studied experimentally. The simulation of the VPSA unit taking into account mass balance, Ergun relation for pressure drop and energy balance was performed in the gPROMS using a bi-LDF approximation for mass transfer and Virial equation for equilibrium. The simulation and experimental results were in good agreement. Furthermore, two-stage VPSA process was adopted and high CO 2 purity and recovery were obtained for post-combustion CO 2 capture using AC beads.

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Section: Theoreticalmentioning

confidence: 99%

Section: Theoreticalmentioning

confidence: 99%

Capture of CO2 from flue gas by vacuum pressure swing adsorption using activated carbon beads

Shen

et al. 2010

Adsorption

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“…(7)- (11)) was solved by the method of lines (MOL) using orthogonal elements, with B-splines as base functions through numerical package PDECOL (Madsen and Sincovec, 1979). This library is specially designed for the solution of the system of PDEs with the structure j u/jt = f (t, x, u, j u/jx, j 2 u/jx 2 ) and it has been used in the simulation of many chemical engineering problems (Lu et al, 1993a,b;Lu and Rodrigues, 1994). For the particular case involved in the mathematical model shown here, the global mass balances for all components, represented by Eq.…”

Section: Numerical Solutionmentioning

confidence: 99%

Kinetic studies in a batch reactor using ion exchange resin catalysts for oxygenates production: Role of mass transfer mechanisms

Silva

Rodrigues

2006

Chemical Engineering Science

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“…When the number of elements used is reduced in each column, the CPU times will be greatly reduced but the accuracy of the simulation results is limited, as mentioned before. Because the boundary conditions at the inlet of each column vary with time, integration of the model equations was very time consuming, and this took the major part of CPU time (15).…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Dynamics of Simulated Moving-Bed Adsorption Separation Processes

Ching

1997

Separation Science and Technology

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Two mathematical models, namely the continuous moving-bed model (steadystate model) and the intermittent moving-bed model (transient model), have been used to describe simulated moving-bed adsorption separation processes. Fourcolumn and 12-column simulated moving-bed systems for the separation of optical isomers with nonlinear adsorption isotherms were studied with the two models. respectively. The model equations were solved by using the numerical method of orthogonal collocation in finite elements. For the 4-column simulated moving bed. the differences between the simulation results from the two mathematical models are very obvious. Process dynamics. i.e., evolution of the species concentrations in the extract and raffinate and the axial profiles at different times, of the above systems in one switching period at the cyclic steady state are presented and discussed. They were numerically simulated with the intermittent moving bed model. The computations in a Cray 5916 computer were very time consuming for the 12-column system.

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Pressure swing adsorption reactors: Simulation of three‐step one‐bed process

Abstract: A three-step cfeed, delay, and purge), one-column pressure swing adsorption reactor has been analyzed. An

Cited by 37 publications

References 20 publications

Capture of CO2 from flue gas by vacuum pressure swing adsorption using activated carbon beads

Capture of CO2 from flue gas by vacuum pressure swing adsorption using activated carbon beads

Kinetic studies in a batch reactor using ion exchange resin catalysts for oxygenates production: Role of mass transfer mechanisms

Dynamics of Simulated Moving-Bed Adsorption Separation Processes

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