Enrichment of low-grade methane by dual reflux vacuum swing adsorption

Guo, Yalou; Gu, Xiaohong; Hu, Guoping; Webley, Paul A.; Li, Gang Kevin

doi:10.1016/j.seppur.2022.121907

Cited by 5 publications

(1 citation statement)

References 42 publications

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“…Consequently, reliable simplified approaches to the design of DRPSA processes are not available. As a matter of fact, most contributions from the literature, involving either experiments − or mathematical models, − designed DRPSA processes through either trial-and-error approaches or using many oversimplifying assumptions. Among the latter approaches, it is worth mentioning the so-called equilibrium theory. ,,,,, Even if this approach can predict the effect of changing the main design parameters, the results are reliable provided the fulfillment of major assumptions, such as instantaneous equilibrium conditions, linear equilibrium isotherms, ideal gas behavior, ideal plug flow conditions in the fixed-bed, isothermal operation, negligible pressure drop, and complete separation of the two components of the mixture.…”

Section: Introductionmentioning

confidence: 99%

On the Design of a Dual Reflux Pressure Swing Adsorption Process

Florit,

Dalla Giovanna,

Storti

et al. 2024

Ind. Eng. Chem. Res.

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Due to the complex interaction among the process operating parameters originated by the two refluxes in dual reflux pressure swing adsorption, to foresee the influence of changes in the main operating parameters is not trivial. On one hand, the reliable rules of thumb effective to design such a process are not available. On the other hand, multi-objective optimization (MOO) algorithms coupled with detailed modeling of the process are also not viable to be used as a daily design tool since the aforementioned complexity can result in huge CPU time demand to achieve cyclic steady-state conditions. In this work, a design tool based on MOO using a properly simplified model of the unit was used to identify suitable relationships between selected target parameters (typically, product purity and energy demand) and the main operating parameters, as suggested by the equilibrium theory. These relationships allowed building a Master plot summarizing the effect of changing such operating parameters on separation performance as well as quickly identifying a small enough operating window where both the target parameters achieve the desired values. The whole procedure has been investigated and validated with reference to the separation of the binary mixture CO 2 −N 2 as a case study.

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Section: Introductionmentioning

confidence: 99%

On the Design of a Dual Reflux Pressure Swing Adsorption Process

Florit,

Dalla Giovanna,

Storti

et al. 2024

Ind. Eng. Chem. Res.

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Upgrading low-concentration oxygen-bearing coal bed methane by dual-reflux vacuum swing adsorption

Guo,

Hu,

Liu

et al. 2024

Adsorption

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Fugitive methane (CH4) is a typical by-product of mining processes, which is commonly known as coal bed methane (CBM) or coal mine gas (CMG). The capture of these CH4 gases can simultaneously avoid greenhouse gas emissions and provide extra energy benefits. However, the explosion risk of low-concentration CBM (CH4 molar fraction ≤ 30%) requires strictly safe operating protocols to conduct the capture process. Dual reflux vacuum swing adsorption (DR-VSA) is a promising candidate with a vacuum operating condition which can lower the explosion risk and simultaneously reach CH4 enrichment and O2 removal targets in product and effluent streams. Herein, a low-concentration oxygen-bearing CBM (20% CH4, 16% O2 and 64% N2) can be upgraded to 69.7 mol% in the product gas while ensuring an effluent concentration of 2.5 mol% by the DR-VSA cycle using ionic liquidic zeolites (ILZ) as the adsorbents. A rigorous safety analysis has been conducted to investigate the explosion risk in the adsorption column and product tank, suggesting that the DR-VSA process is a safe technology for upgrading low-concentration oxygen-bearing methane.

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Recent advances in abatement of methane and sulfur hexafluoride non-CO2 greenhouse gases under dual-carbon target

Zhao,

Xu,

2024

Science of The Total Environment

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Enrichment of low-grade methane by dual reflux vacuum swing adsorption

Cited by 5 publications

References 42 publications

On the Design of a Dual Reflux Pressure Swing Adsorption Process

On the Design of a Dual Reflux Pressure Swing Adsorption Process

Upgrading low-concentration oxygen-bearing coal bed methane by dual-reflux vacuum swing adsorption

Recent advances in abatement of methane and sulfur hexafluoride non-CO2 greenhouse gases under dual-carbon target

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