Air separation by pressure swing adsorption on a carbon molecular sieve

Hassan, M.M.; Ruthven, Douglas M.; Raghavan, N.S.

doi:10.1016/0009-2509(86)87106-8

Cited by 94 publications

(47 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A total feed gas flow rate of 30 mL min −1 STP was kept constant during the adsorption step. The CO 2 and CH 4 concentrations in the gas stream exiting the adsorption column were continuously monitored as a function of time (breakthrough curve) by means of a micro gas chromatograph until the composition approached the inlet gas composition set point, i.e., until saturation was reached. Afterwards, the adsorbed CO 2 was completely desorbed by raising the temperature of the bed to 180 ˚C for 60 min at a He flow rate of 50 mL min −1 STP.…”

Section: Fixed Bed Adsorption-desorption Experimentsmentioning

confidence: 99%

“…Pressure swing adsorption (PSA) has become very prominent in the purification of gases for multiple applications, namely air purification [1,2], hydrogen separation and purification [3][4][5][6], and CO 2 capture [7,8]. Due to their ability to separate carbon dioxide from methane, PSA processes are currently being extended to areas like biogas and landfill gas upgrading.…”

Section: Introductionmentioning

confidence: 99%

“…Previous research conducted in our laboratory has successfully demonstrated the great potential of cherry stone-based carbons for biogas upgrading. They were tested for their CO 2 and CH 4 equilibrium adsorption capacities at high pressures under static [19] and dynamic conditions in a purpose-built lab-scale fixed-bed unit [20].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

176

View full text Add to dashboard Cite

Most practical applications of solids in industry involve porous materials and adsorption processes. A correct assessment of the equilibrium and kinetics of adsorption is extremely important for the design and operation of adsorption based processes. In our previous studies we focused on the evaluation of the equilibrium of CO 2 /CH 4 adsorption on cherry stone-based carbons. In the present paper the kinetics of adsorption of CO 2 on two cherry stone-based activated carbons (CS-H 2 O and CS-CO 2 ), previously prepared in our laboratory, has been evaluated by means of transient breakthrough experiments at different CO 2 /CH 4 feed concentrations, at atmospheric pressure and 30 ˚C. A commercial activated carbon, Calgon BPL, has also been evaluated for reference purposes. Three models have been applied to estimate the rate parameters during the adsorption of CO 2 on these carbons, pseudo-first, pseudo-second and Avrami´s fractional order kinetic models. Avrami´s model accurately predicted the dynamic CO 2 adsorption performance of the carbons for the different feed gas compositions. To further investigate the mechanism of CO 2 adsorption on CS-H 2 O, CS-CO 2 and Calgon BPL, intra-particle diffusion and Boyd´s film-diffusion models were also evaluated. It was established that mass transfer during the adsorption of CO 2 from CO 2 /CH 4 is a diffusion-based process and that the main diffusion mechanisms involved 2 are intra-particle and film diffusion. At the initial stages of adsorption, film diffusion resistance governed the adsorption rate, whereas intra-particle diffusion resistance was the predominant factor in the following stages of adsorption.

show abstract

Section: Fixed Bed Adsorption-desorption Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Álvarez-Gutiérrez

Gil

Rubiera

et al. 2017

Chemical Engineering Journal

176

View full text Add to dashboard Cite

show abstract

“…This is because of the fact that product rate was not kept constant in the abovementioned study; however, in the present study the product rate was kept constant. In most of the cases studied here, recovery is following a similar trend as that of product purity, because for a given product rate and feed rate, the recovery will be proportional to the purity as it is obvious from equation (13). However, it may vary if the product flow rate or feed rate is not kept constant and possibly this may be the reason for a dissimilar trend from earlier studies as mentioned above.…”

mentioning

confidence: 53%

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

Beeyani

Singh

Vyas

et al. 2010

Polish Journal of Chemical Technology

View full text Add to dashboard Cite

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.

show abstract

“…Oxygen is mainly used in the metal-mechanic industries, oxidation of the natural gas, medical unit, and integrated gasification combined cycle (IGCC) (Andersson and Johnsson, 2006), oxy-fuel combustion (Yin et al, 2008), solid oxide fuel cell (SOFC) (Hutchings et al, 2008), and so on. Several technologies are commercially employed to produce O 2 , including cryogenic distillation (the most common method) (Castle, 2002;Kerry, 2007;Häring, 2008), membrane separation (Schreiber et al, 2013), pressure swing adsorption (PSA) (Hassan and Ruthven, 1986;Jiang et al, 2003). Cryogenic distillation, with high investment costs, is a well-developed and established technique for large-scale production of pure oxygen.…”

Section: Introductionmentioning

confidence: 99%

O2 Release of Mn-Based Oxygen Carrier for Chemical Looping Air Separation (CLAS): An Insight into Kinetic Studies

Wang

Zhang

Wang

et al. 2016

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

Chemical looping air separation (CLAS) is an air separation technology with a relatively small energy footprint. In this contribution, the kinetic study of Mn-based oxygen carriers has been carried out in a CLAS process. The O 2 release behavior was investigated under Ar in a fixed bed. Results showed O 2 release amounts increase gradually with an increasing temperature. Moreover, fitting various gas-solid reaction mechanisms with the experimental data was used to obtain the chemical reaction kinetics for MnO 2 and Mn 2 O 3 for O 2 release. As for all involved gas-solid reaction mechanisms, the first-order chemical reaction model (C1) and Avrami-Erofe'ev random nucleation and subsequence growth model (A2) fitted well with O 2 release experimental data for MnO 2 and Mn 2 O 3 , respectively. Furthermore, activation energy, pre-exponential factor and reaction order were also determined for these models.

show abstract

Air separation by pressure swing adsorption on a carbon molecular sieve

Cited by 94 publications

References 11 publications

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

Kinetics of CO2 adsorption on cherry stone-based carbons in CO2/CH4 separations

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

O2 Release of Mn-Based Oxygen Carrier for Chemical Looping Air Separation (CLAS): An Insight into Kinetic Studies

Contact Info

Product

Resources

About