Application of gas hydrate formation in separation processes: A review of experimental studies

Eslamimanesh, Ali; Mohammadi, Amir H.; Richon, Dominique; Naidoo, Paramespri; Ramjugernath, Deresh

doi:10.1016/j.jct.2011.10.006

Cited by 494 publications

(336 citation statements)

References 203 publications

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“…Whereas most previous efforts were directed toward looking for ways to avoid hydrate formation (hydrate inhibition), the focus is now also on finding ways to promote their formation at moderate temperatures and pressures (hydrate promotion). Sun et al (2011) and Eslamimanesh et al (2012) have reviewed recent advances in gas hydrate research including applications of promoted gas hydrate formation in processes for methane/natural gas storage, fuel gas (hydrogen) storage, and gas separation (e.g. carbon dioxide capture).…”

Section: Gas Hydrate Formation With Thermodynamic Promotionmentioning

confidence: 99%

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Herslund

Thomsen

Abildskov

et al. 2013

International Journal of Greenhouse Gas Control

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Section: Gas Hydrate Formation With Thermodynamic Promotionmentioning

confidence: 99%

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Herslund

Thomsen

Abildskov

et al. 2013

International Journal of Greenhouse Gas Control

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“…While CH 4 is the most notorious gas molecule being the dominant natural gas, larger natural gas compounds with specific steric hindrance like ethane, propane and isobutane can also be enclathrated into the water lattice (e.g., Kida et al [5], Lu et al [6], Bourry et al [7]). Amongst the notable physicochemical properties of gas hydrates are their high selectivity in enclathrating guest molecules and the high storage capacity of those gases (e.g., Gudmundsson et al [8], Sloan [9], Sloan and Koh [1], Eslamimanesh et al [10]). …”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

et al. 2018

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This article presents gas hydrate experimental measurements for mixtures containing methane (CH 4 ), carbon dioxide (CO 2 ) and nitrogen (N 2 ) with the aim to better understand the impact of water (H 2 O) on the phase equilibrium. Some of these phase equilibrium experiments were carried out with a very high water-to-gas ratio that shifts the gas hydrate dissociation points to higher pressures. This is due to the significantly different solubilities of the different guest molecules in liquid H 2 O. A second experiment focused on CH 4 -CO 2 exchange between the hydrate and the vapor phases at moderate pressures. The results show a high retention of CO 2 in the gas hydrate phase with small pressure variations within the first hours. However, for our system containing 10.2 g of H 2 O full conversion of the CH 4 hydrate grains to CO 2 hydrate is estimated to require 40 days. This delay is attributed to the shrinking core effect, where initially an outer layer of CO 2 -rich hydrate is formed that effectively slows down the further gas exchange between the vapor phase and the inner core of the CH 4 -rich hydrate grain.

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“…On the other hand, the large storage capacity of clathrate hydrates has led to suggestions for their use in carbon dioxide sequestration 7 and hydrogen storage. 8 Furthermore, the well-defined cage structure and size-specific intercage diffusion of guest molecules might lead to applications of clathrate hydrates for gas separation 9 and for matrix isolation of reactive species, even to their use as "nanoreactors". 10 The crystal lattice structures of clathrate hydrates are determined by the size of their guest molecules.…”

Section: Introductionmentioning

confidence: 99%

Characterization of free radicals in clathrate hydrates of pyrrole, thiophene, and isoxazole by muon spin spectroscopy

et al. 2018

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Gas hydrates have long been of interest to the petrochemical industry but there has been growing interest in potential applications for carbon dioxide sequestration and hydrogen storage. This has prompted many fundamental studies of structure and host-guest interactions, but there has been relatively little investigation of chemical reactions of the guest molecules. In previous work we have shown that it is possible to use muon spin spectroscopy to characterize H-atom-like muonium and muoniated free radicals formed in clathrate hydrates. Muonium forms in clathrate hydrates of cyclopentane and tetrahydrofuran, whereas furan and its dihydro-derivatives form radicals. The current work extends studies to clathrates hydrates of other 5-membered heterocycles: thiophene, pyrrole and isoxazole. All form structure II hydrates. In addition to the clathrates, pure liquid samples of the heterocycles were studied to aid in the assignment of radical signals and for comparison with the enclathrated radicals. Similar to furan, two distinct radicals are formed when muonium reacts with thiophene and pyrrole. However, only one muoniated radical was detected from isoxazole. Muon, proton and nitrogen hyperfine constants were determined and compared with values predicted by DFT calculations to aid the structure assignments. The results show that Mu adds preferentially to the carbon adjacent to the heteroatom in thiophene and pyrrole, and to the carbon adjacent to O in isoxazole. The same radicals are formed in clathrates, but the spectra have broader signals, suggesting slower tumbling. Furthermore, additional signals in the avoided levelcrossing spectra indicate anisotropy consistent with restricted motion of the radicals in the clathrate cages.

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Application of gas hydrate formation in separation processes: A review of experimental studies

Cited by 494 publications

References 203 publications

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Thermodynamic promotion of carbon dioxide–clathrate hydrate formation by tetrahydrofuran, cyclopentane and their mixtures

Experimental Study of Mixed Gas Hydrates from Gas Feed Containing CH4, CO2 and N2: Phase Equilibrium in the Presence of Excess Water and Gas Exchange

Characterization of free radicals in clathrate hydrates of pyrrole, thiophene, and isoxazole by muon spin spectroscopy

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