Upgrading sub-quality natural gas by dual reflux-pressure swing adsorption using activated carbon and ionic liquidic zeolite

Weh, R.; Xiao, Gongkui; Islam, Ashraful

doi:10.1016/j.cej.2019.123753

Cited by 24 publications

(24 citation statements)

References 32 publications

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“…The simulation will be considered at the CSS when the error is lower than the preset tolerance, which is 10 −5 in this model. At CSS, the average overall material balance error is −0.3%, whereas the average CH 4 and N 2 component material balance error is 3.5% and −0.7%, respectively, comparable in magnitude to those of other DR‐PSA models reported in the open literature 27,29,32,33 . The root‐mean‐square deviation (RMSD) evaluates the average error between the experimental and simulated results.…”

Section: Simulation Detailsmentioning

confidence: 56%

“…Zhang et al 27 developed a non‐isothermal numerical model in the software package Aspen Adsorption and compared their results with experiments by Saleman et al 22 In this work, they used an ideal compressor during the constant pressure (FE and PU) steps, resulting in a high average material balance error of 8.6%; hence, the flow rate of light product and the concentrations of both product streams needs to be corrected manually. Zou et al 28 reported an advanced non‐isothermal simulation model of the DR‐PSA process and compared the predicted results with the experimental data from the study by McIntyre et al 14 and Saleman et al 22 In this study, the isentropic compressor module and the proportional–integral–derivative (PID) controller module were applied to achieve the desired pressure profile, the standard deviation of the simulated predictions was 0.003 mol fraction in the ethane (C 2 H 6 ) product stream compared with the experimental results from the study by McIntyre et al and 0.04 in the CH 4 product stream compared with the experimental data from the study by Saleman et al May and coworkers 29–32 conducted a series of simulation‐based studies of upgrading subquality natural gas by the DR‐PSA cycle, in which activated carbon, ionic liquidic zeolite, 34 and ETS‐4 were used as adsorbents successively.…”

Section: Introductionmentioning

confidence: 96%

“…There have been several simulation investigations of DR‐PSA processes, ranging from equilibrium‐based analytical models 7,23–26 to rigorous non‐isothermal numerical models 20,27–32 . Ebner and Ritter 23 established the first mathematical model based on equilibrium theory with a few simplified isotherm assumptions.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Capture of dilute methane with a novel dynamic‐feed dual‐reflux pressure swing adsorption process

Guo

Chen

et al. 2021

AIChE Journal

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Dual‐reflux pressure swing adsorption (DR‐PSA) is a state‐of‐art adsorption technology claiming to achieve both high product purity and recovery. However, its performance is inevitably limited by the gas mixing problem at the feed inlet position in adsorption columns, where a discontinuity in the columns' axial concentration profiles disturbs the separation. Here, we developed a dynamic‐feed DR‐PSA (DF‐DR‐PSA) process to solve the mixing problem and obtain better separation performance by introducing multiple feed inlets along the column. The DF‐DR‐PSA process was demonstrated by enrichment methane (CH4) from a binary gas mixture containing 2.4 mol.% CH4 in nitrogen (N2) using activated carbon material. Non‐isothermal dynamic models were constructed to investigate the effects of operating parameters on the separation performance. The results showed the DF‐DR‐PSA process achieved both higher methane purity (53.5% vs. 47.5%) and recovery (81.1% vs. 72.2%) over the conventional DR‐PSA process at the same energy consumption.

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Section: Simulation Detailsmentioning

confidence: 56%

Section: Introductionmentioning

confidence: 96%

See 1 more Smart Citation

Capture of dilute methane with a novel dynamic‐feed dual‐reflux pressure swing adsorption process

Guo

Chen

et al. 2021

AIChE Journal

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“…There are two utilization methods: purification method and combustion method. The common low concentration gas purification technologies are cryogenic rectification technology, 6,7 membrane separation technique 8,9,10 and pressure swing absorption, 11,12,13 etc. If the concentration of purified gas being more than 80%, it can be used as high-energy fuel and chemical raw materials.…”

Section: Introductionmentioning

confidence: 99%

Study on explosion risk assessment of low‐concentration gas safe combustion system based on FAHP‐fuzzy fault tree

Zheng

Chen

Xue

et al. 2021

Quality & Reliability Eng

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Explosion is the most dangerous accident during direct combustion of lowconcentration gas. Few investigations have focused on explosion risk assessment of low-concentration gas safe combustion system. This study aims to analyze explosion risk of above system. Due to insufficient accident data for calculating the failure probability of explosion, expert evaluation method and fuzzy algorithm were adopted to obtain the failure probability of basic events (BEs) and Fuzzy Analytic Hierarchy (FAHP) Process method used to improve the calculation of expert weights. Then qualitative and quantitative analysis was carried out using fault tree analysis. Results show that the failure probability of system explosion is 0.085%. Events with high-risk probability are mainly on equipment management and personnel behavior norms. Safe combustion system has excellent performance on tempering prevention, explosion resistance and explosion relief. The outcomes of this study are expected to help the safety professionals while formulating safety management measures for low-concentration gas safety combustion system.

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“…[26][27][28] Figure 1 schematically depicts a half-cycle of the DR PSA process and its four basic cycle configurations (identified by Kearns et al 28 ). The DR PSA configurations are combinations of the feed inlet column, which is either the high-pressure (PH) or low-pressure (PL) bed, and using either heavy 17,33,35,[38][39][40][41] Most recently, we investigated N2 rejection from sub-quality natural gas (85 mol% CH4 + 15 mol% N2) by DR PSA using a novel CH4selective adsorbent and achieved 93 mol% CH4 purity and 99 % CH4 recovery. In addition, the purity of the N2 rich product was > 99 mol% N2 allowing to vent it to the atmosphere, which is beneficial in cases where combustion is impractical.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Rejection by Dual Reflux Pressure Swing Adsorption Using Engelhard Titanosilicate Type 4

Weh

Xiao

Islam

et al. 2020

Ind. Eng. Chem. Res.

Self Cite

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The need for cost-efficient technologies for natural gas processing coupled with low environmental impact is becoming increasingly important due to the growing production of natural gas from subquality gas wells. The removal of nitrogen from such gas sources is especially challenging because of the similar properties of nitrogen and methane. This work studies the separation of an 85 mol% CH4 + 15 mol% N2 gas mixture by dual reflux pressure swing adsorption (DR PSA) using a N2-selective Engelhard titanosilicate type 4, ETS-4, as adsorbent via numerical simulations. Key DR PSA process parameters, such as the heavy product to feed flow ratio, the light reflux flow rate, and the feed step duration, were investigated to maximize the separation performance. In addition, productivity and energy requirements of the four DR PSA cycle configurations, namely PL-A, PH-A, PL-B and PH-B, were determined. The goal was to evaluate the capabilities of the nitrogen-selective ETS-4 in conjunction with the DR PSA process aiming to produce two useful product streams meeting pipeline specifications (> 93 mol% CH4) and environmental regulations (> 99 % N2). It was found that ETS-4 can easily upgrade the CH4 content of the gas mixture to pipeline specifications at high recovery but cannot meet the environmental regulations. The gas enriched in N2 needs to be further processed or can be used for electricity production via post-combustion.

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Upgrading sub-quality natural gas by dual reflux-pressure swing adsorption using activated carbon and ionic liquidic zeolite

Cited by 24 publications

References 32 publications

Capture of dilute methane with a novel dynamic‐feed dual‐reflux pressure swing adsorption process

Capture of dilute methane with a novel dynamic‐feed dual‐reflux pressure swing adsorption process

Study on explosion risk assessment of low‐concentration gas safe combustion system based on FAHP‐fuzzy fault tree

Nitrogen Rejection by Dual Reflux Pressure Swing Adsorption Using Engelhard Titanosilicate Type 4

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