Experiment and simulation for separating CO2/N2 by dual-reflux pressure swing adsorption process

Li, Dongdong; Zhou, Yan; Shen, Yuanhui; Sun, Wei; Fu, Qiang; Yan, Haiyu; Zhang, Donghui

doi:10.1016/j.cej.2016.03.075

Cited by 84 publications

(38 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the model parameter regression, we found that the parameters that were obtained by the DSL model and the M-DSL model were quite different at different temperatures and that the adsorption energy, which was found to have a linear relationship with the pressure obtained by a GCMC simulation, can modify the DSL model at different temperatures and had a good effect. In order to further verify this conclusion, we chose the DSL model that reflects temperature changes (TDSL), which is used in the adsorption module of Aspenplus and has been used in previous research [16][17][18], and attempted to improve its accuracy and universality. The TDSL model is a two-parameter adsorption equilibrium model that is based on the DSL model and takes temperature and pressure as variables together.…”

Section: Modification Of the Tdsl Model That Reflects Temperature Chamentioning

confidence: 99%

“…These assumptions make the DSL model suitable for most systems and applicable under different temperatures and pressures. For example, the adsorption module in Aspenplus, the chemical engineering simulation software, uses the DSL model to reflect temperature changes to correlate various adsorption isotherms [16][17][18]. However, the applicability of the DSL model remains limited.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modified Dual-Site Langmuir Adsorption Equilibrium Models from A GCMC Molecular Simulation

Wang

Wei

2020

Applied Sciences

View full text Add to dashboard Cite

In the modern industrial separation process, the pressure swing adsorption technology is widely used to separate and purify gases due to its low energy consumption, low cost, convenience, reliability, and environmental benignity. The basic elements of the design and application of the pressure swing adsorption process are adsorption isotherms at different temperatures for adsorbents. The dual-site Langmuir (DSL) adsorption equilibrium model is the mostly used model; however, this model is based on the assumption that the adsorption energy on the surface of an adsorbent is uniform and remains unchanged. Here, a grand canonical Monte Carlo (GCMC) molecular simulation was used to calculate the CO 2 adsorption equilibrium on MIL-101 (Cr) at 298 K. MIL-101 (Cr) was chosen, as it has more a general pore structure with three different pores. The calculation results showed that the adsorption energies with different adsorption pressures fitted a normal distribution and the relationship of the average adsorption energies, E with pressures had a linear form described as: E = aP + c. With this relationship, the parameter b = k·exp (E/RT) in the DSL model was modified to b = k·exp ((aP + c)/RT) , and the modified DSL model (M-DSL) was used to correlate the adsorption equilibrium data on CO 2 -MIL-101 (Cr), C 2 H 4 -HHPAC, CH 4 -BPL, and CO 2 -H-Mordenite, showing better correlations than those of the DSL model. We also extended the parameter q m in the M-DSL model with the equation q m = k 1 + k 2 T to adsorption equilibrium data for different temperatures. The obtained model (M-TDSL) was checked with the abovementioned adsorption equilibrium systems. The fitting results also indicated that the M-TDSL model could be used to improve the correlation of adsorption equilibrium data for different temperatures. The linear relationship between the average adsorption energy and adsorption pressure could be further tested in other adsorption equilibrium models to determine its universality.

show abstract

Section: Modification Of the Tdsl Model That Reflects Temperature Chamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modified Dual-Site Langmuir Adsorption Equilibrium Models from A GCMC Molecular Simulation

Wang

Wei

2020

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…1; Saleman et al 2015;Zhang et al 2016;May et al 2017) and the light recycle ( ̇n LR in Fig. 1; Bhatt et al 2014;Shen et al 2017;Zhang et al 2016;Tian et al 2017;Li et al 2016) have been identified as major operating parameters to tune the product purity. On the other hand, the effect of changing the pressure ratio, , has not been systematically investigated, even though it can be expected to affect significantly the DR-PSA process performances.…”

Section: Process Performance Improvementmentioning

confidence: 99%

“…While relying on the basic features of PSA, complete separations are enabled by a lateral feed injection and two recycles (one of heavy and the other of light component). Following the first proposal, several papers explored different experimental applications of DR-PSA for separating different mixtures, namely: mixtures carrying CO 2 (Wawrzynczak et al 2019;Shen 2017;Li et al 2016;Kim et al 2016;Sivakumar et al 2011a, b;Takamura et al 2001;Diagne et al 1995Diagne et al , 1994), N 2 /O 2 (Wang et al 2019;Tian et al 2017), N 2 /CH 4 (Weh et al 2020;Xiao et al 2019;Zhang et al 2016;Salemann et al 2015), and N 2 /C 2 H (Mc Intyre 2002, 2010. This body of work built the basic understanding of the main features and capabilities of DR-PSA.…”

Section: Introductionmentioning

confidence: 99%

Influence of the main operating parameters on the DRPSA process design based on the equilibrium theory

2020

View full text Add to dashboard Cite

Among the adsorption-based separation processes for gaseous mixtures, those exploiting pressure variations, so-called Pressure Swing Adsorption (PSA) processes, are the most popular. In this work, we focus on the specific PSA configuration known as Dual Reflux-Pressure Swing Adsorption (DR-PSA) given its ability to achieve sharp separations. In the case of binary mixtures, an analytical approach based on Equilibrium Theory has been proposed to identify the operating conditions for complete separation under the assumption of linear isotherms. This same approach is not available when the separation is not complete. Accordingly, in this work we study the features of non-complete separations by solving numerically a general DR-PSA model with parameter values suitable to approach equilibrium conditions (no mass transport resistances, no axial mixing, isothermal conditions and no pressure drop), thus reproducing the analytical solution when complete separations are examined. Even for non-complete separations, triangularly shaped regions at constant purity can be identified on a plane whose axes correspond to suitable design parameters. Moreover, we found a general indication on how to select the lateral feed injection position to limit the loss in product purities when complete separation is not established, whatever is the composition of the feeding mixture. Finally, a sensitivity analysis with respect to pressure ratio, light reflux ratio and heavy product flowrate is proposed in order to assess how to recover product purities according to the specific degrees of freedom of a DR-PSA apparatus.

show abstract

“…PSA is a very versatile technology for separation and purification of gas mixtures. The PSA technology was widely used in large variety of application such as hydrogen purification [41][42][43] , CO 2 capture [44][45] , methane 46 , toxic gas h 2 S removal [47][48] , noble gas purification 49 , etc. Due to its outstanding capabilities, PSA technologies have been found to be more effective against CWA in terms of time duration, regenerability, and avoid the unnecessary logistic and economic burden for the filter operation.…”

Section: Pressure Swing Adsorptionmentioning

confidence: 99%

Pressure Swing Adsorption Based Air Filtration/Purification Systems for NBC Collective Protection

Singh

Boopathi

et al. 2016

Def. Life. Sc. Jl.

View full text Add to dashboard Cite

The respiratory protection against chemical warfare agents (CWA) has become a worldwide security concern in light of the many recent international threats utilising CWA. Till date the carbon filtration was adequate to protect the soldiers from the threats of CWA. With the advent of further advancements in the CWA a new threat is looming large that is known as the carbon breakers. pressure swing adsorption (PSA) is a well-established gas separation technique in air separation, gas drying, and hydrogen purification separation. Recently, PSA technology has been applied in the area of chem-bio defence by virtue of its unique advantages. This article reviews recent advances and developments in the field of PSA based purification, separation, and its use in defense sector. This emerging and advanced PSA technology can provide regenerative nuclear, biological and chemical (NBC) collective protection for ground vehicles, aircraft, ships and shelters. This PSA technology challenges threat scenario developed which includes nerve, blood and blister agents, as well as a "carbon breaker" agent, and proved that this technology will be a viable concept for future NBC collective protection systems. New technological breakthroughs and greater sophistication of PSA technologies will transform the collective protection based PSA technology in real field sense, addressing the escalating threat of CWA. We conclude this review with future prospects and challenges associated with PSA technology.

show abstract

Experiment and simulation for separating CO2/N2 by dual-reflux pressure swing adsorption process

Cited by 84 publications

References 56 publications

Modified Dual-Site Langmuir Adsorption Equilibrium Models from A GCMC Molecular Simulation

Modified Dual-Site Langmuir Adsorption Equilibrium Models from A GCMC Molecular Simulation

Influence of the main operating parameters on the DRPSA process design based on the equilibrium theory

Pressure Swing Adsorption Based Air Filtration/Purification Systems for NBC Collective Protection

Contact Info

Product

Resources

About