Helium extraction and nitrogen removal from LNG boil-off gas

Xiong, Lei; Peng, Nan; Liu, L; Gong, Ling

doi:10.1088/1757-899x/171/1/012003

Cited by 14 publications

(8 citation statements)

References 2 publications

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“…), ultrapure CH 4 gas is responsible for the high-quality downstream products. , On the other hand, C 3 H 8 and C 2 H 6 gases are both important raw materials of propylene and ethylene, respectively. ,,− To achieve ultrapure CH 4 gas and simultaneously recover the individual C 3 H 8 and C 2 H 6 gases, efficient pipeline NG upgrading by their recoveries is highly necessary. Currently, the production of the ultrapure CH 4 gas by the secondary low-temperature distillation of the byproduct from the helium extraction unit and the recoveries of C 3 H 8 and C 2 H 6 gases from the NG by the cryogenic fractional distillation process ,,, are both rather energy-consuming. In terms of convenience and energy-saving, the method based upon gas adsorption separation using porous solid adsorbents has significant advantages. − Different from zeolites with limited structural availability and activated carbons with poor selectivity for gas separation, metal–organic frameworks (MOFs) have been promising candidates as a new type of adsorbent for the recovery of C 3 H 8 and C 2 H 6 gases from the NG and have attracted a great deal of research interest due to their diversified structures, high porosity, tunable pore sizes, adjustable pore surface properties, etc. ,,,,,, …”

Section: Introductionmentioning

confidence: 99%

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C₃H₈ and C₂H₆ Gases

Cheng

Wang

Meng

et al. 2021

ACS Appl. Mater. Interfaces

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Due to the ultralow amounts of C 3 H 8 and C 2 H 6 gases, to design and synthesize water-stable MOFs that are promising for real-world efficient pipeline natural gas (NG) upgrading by the recovery of individual C 3 H 8 and C 2 H 6 gases is still a great challenge. Here, a N/O/F heteroatom-rich and rooflike [Cu(II) 4 Cu(I) 2 (COO) 4 (tetrazolyl) 6 ] cluster-based ultra-microporous tsi-MOF (SNNU-Bai68) was afforded as a multiple heteroatom-rich and curved-surface-shaped cluster-based ultramicroporous MOF and the first porous MOF based upon such rooflike [Cu(II) x Cu(I) y (tetrazolyl) z ] (2x+y−z)+ cluster. In SNNU-Bai68, the rooflike cluster was further assembled into a 1D chain secondary building block (SBB), which led to a high density of accessible potential adsorptive sites. Very interestingly, it exhibited the most promising balance of high gas adsorption uptakes at 0.01, 0.03, and 0.05 bar, high C 3 H 8 /CH 4 , C 3 H 8 /C 2 H 6 , and C 2 H 6 /CH 4 adsorption selectivities, moderate adsorption enthalpies, and high water and chemical stability for pipeline natural gas upgrading by the recovery of individual C 3 H 8 and C 2 H 6 gases, which was further confirmed by the breakthrough experiments of the gas mixtures with/without 74% RH. Furthermore, the SC-XRD and GCMC studies revealed that the successful separation of C 3 H 8 , C 2 H 6 , and CH 4 gases in SNNU-Bai68 is due to different synergistic effects of H-bonds between the frameworks at three adsorptive sites around each rooflike cluster and those different gas molecules, which were initially described systematically by the number of H atoms from the gas molecules, the total number of H-bonds within the synergistic H-bonds, and the binding energy of the framework at an adsorption site toward the gas molecules. In addition, this work may provide a method for the construction of a multiple heteroatom-rich and curved-surface-shaped cluster-based ultra-microporous MOF as a novel approach to build MOFs with polar pore surfaces, suitable pore sizes, and unique pore shapes to maximize the synergistic H-bonds between the framework and guests. KEYWORDS: N/O/F-rich MOF, rooflike cluster, chemically stable, pipeline natural gas upgrading, C 3 H 8 and C 2 H 6 recovery

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Section: Introductionmentioning

confidence: 99%

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C₃H₈ and C₂H₆ Gases

Cheng

Wang

Meng

et al. 2021

ACS Appl. Mater. Interfaces

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“…A manipulated exclusive reaction of Li with N 2 will find potential applications in the separation of N 2 from pretreated natural gas streams (mainly containing N 2 and CH 4 )among the most challenging and important gas separation applications . In such gas streams, N 2 is regarded as an impurity that needs to be removed . The state-of-the-art technology for N 2 removal from natural gas is cryogenic distillation, a process that is highly energy-intensive .…”

Section: Introductionmentioning

confidence: 99%

“…12 In such gas streams, N 2 is regarded as an impurity that needs to be removed. 13 The state-of-the-art technology for N 2 removal from natural gas is cryogenic distillation, a process that is highly energy-intensive. 14 A material capable of reacting with N 2 but not with CH 4 at ambient temperature and thus exclusively removing N 2 would afford an exceptionally high selectivity and thus an efficient route for natural gas purification.…”

Section: Introductionmentioning

confidence: 99%

Facilitated Dissociation of Water in the Presence of Lithium Metal at Ambient Temperature as a Requisite for Lithium–Gas Reactions

Shang

Shirazian

2018

J. Phys. Chem. C

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The high reactivity of lithium with gas molecules under ambient conditions plays a key role, negative or positive, depending on the purpose, in its wide applications. However, the underlying mechanism is still unclear. A facilitated dissociation of water in the presence of lithium (Li) under ambient conditions is revealed using molecular simulations. The subsequent reactions with other gases are investigated to elucidate the role of water in enabling lithium–gas reactions. The in-depth understanding of controlled lithium reactively opens up a new avenue of designing highly selective gas separation processes. A controlled exclusive reaction of lithium with nitrogen in the nitrogen/methane mixture would provide infinite selectivity of nitrogen over methane, revolutionizing the natural gas purification industry.

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“…Helium (He) is a nonrenewable noble gas, which has a wide range of applications in the space industry, scientific research, medical facilities, and many other critical areas with increasing market demand 1,2 . Hence, helium has been admitted as an indispensable strategic resource 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Separation of He/N₂/CH₄ ternary mixtures by a triple‐reflux pressure swing adsorption process

et al. 2022

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Conventional pressure swing adsorption (PSA) processes can only produce one high purity product in a single stage, whereas the state-of-art dual-reflux PSA (DR-PSA) can produce two high purity products simultaneously. However, multicomponent gas separation is often required in the industry, targeting at recovering several valued products at the same time. In this study, we propose a novel adsorption process, namely triple-reflux PSA (TR-PSA), to separate three components simultaneously. A middle product outlet and a middle reflux stream were introduced to the adsorption columns of a conventional DR-PSA process to separate ternary mixtures of nitrogen, methane, and helium. Nonisothermal dynamic models were built to investigate the impacts of operating parameters particularly the location of the middle reflux/ product stream and the middle reflux flow rates. Results showed that the TR-PSA process successfully separated ternary mixtures obtaining three enriched products simultaneously in a single stage, yielding a separation performance comparable to that of the double-stage DR-PSA with significantly lower capital and energy cost.

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Helium extraction and nitrogen removal from LNG boil-off gas

Cited by 14 publications

References 2 publications

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C₃H₈ and C₂H₆ Gases

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C₃H₈ and C₂H₆ Gases

Facilitated Dissociation of Water in the Presence of Lithium Metal at Ambient Temperature as a Requisite for Lithium–Gas Reactions

Separation of He/N₂/CH₄ ternary mixtures by a triple‐reflux pressure swing adsorption process

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Helium extraction and nitrogen removal from LNG boil-off gas

Cited by 14 publications

References 2 publications

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C3H8 and C2H6 Gases

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C3H8 and C2H6 Gases

Facilitated Dissociation of Water in the Presence of Lithium Metal at Ambient Temperature as a Requisite for Lithium–Gas Reactions

Separation of He/N2/CH4 ternary mixtures by a triple‐reflux pressure swing adsorption process

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Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C₃H₈ and C₂H₆ Gases

Formation of a N/O/F-Rich and Rooflike Cluster-Based Highly Stable Cu(I/II)-MOF for Promising Pipeline Natural Gas Upgrading by the Recovery of Individual C₃H₈ and C₂H₆ Gases

Separation of He/N₂/CH₄ ternary mixtures by a triple‐reflux pressure swing adsorption process