CO2 (carbon dioxide) separation from CO2–H2 (hydrogen) gas mixtures by gas hydrates in TBAB (tetra-n-butyl ammonium bromide) solution and Raman spectroscopic analysis

Xu, Chun‐Gang; Zhang, Shaohong; Cai, Jing; Chen, Zhaoyang; Li, Xiao-Sen

doi:10.1016/j.energy.2013.07.056

Cited by 114 publications

(42 citation statements)

References 27 publications

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“…5 In addition, intensive studies have focused on the possible application of gas hydrates and ionic clathrate hydrates in different technologies, such as carbon dioxide capture and sequestration, [6][7][8][9][10][11] air-conditioning systems, [12][13][14][15][16] water desalination/treatment technology, [17][18][19] gas separation and storage [7][8][9][10][11][20][21][22] . However, high gas pressures and low temperatures required for gas hydrate formation constrain their practical application.…”

Section: Introductionmentioning

confidence: 99%

Semiclathrate Hydrates in Tri-n-butylphosphine Oxide (TBPO)–Water and TBPO–Water–Methane Systems

et al. 2017

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In the present work, we studied semiclathrate hydrates in the TBPO-HO and TBPO-HO-CH systems. The stoichiometry, temperature, and enthalpy of dissociation of TBPO semiclathrate hydrate crystals formed in the TBPO-HO binary system were found to be TBPO·33.6 ± 0.9HO, 280.0 K, and 253.1 ± 4.7 J g, respectively. The crystal structure determined by single crystal XRD analysis (150 K) was the orthorhombic with space group Pbam and unit cell parameters a = 19.9313(8) Å, b = 23.4660(7) Å, and c = 12.1127(5) Å. The structural stoichiometry is TBPO·34.5HO. The TBPO guest molecules arrangement within the host water framework has been refined for the first time. The discrepancy between the analytically measured and structural stoichiometry is likely to be attributed to the structure defects, which cannot be revealed by the routine single-crystal XRD analysis. The methane capacity of TBPO + CH double hydrate was measured by the thermovolumetric method in the range 14.9-55.8 wt % TBPO aqueous solution at a methane pressure of 8.5 ± 0.5 MPa and temperature of 274 ± 1 and 286 ± 1 K. The maximum included methane volumes of 61.6-74.6 mL/g were observed for the TBPO + CH double hydrates synthesized from ∼26-30 wt % TBPO aqueous solutions. Powder X-ray diffraction measurements of the hydrate samples used in the thermovolumetric experiments revealed that the TBPO + CH double hydrate has the same structural characteristics as the simple TBPO hydrate. The study of the Raman spectra of the TBPO + CH double hydrate and TBPO simple hydrate showed that in the TBPO + CH double hydrate CH molecules selectively occupy the small D cages. The results of the present study did not confirm the earlier suggestion of the formation of several structural types of hydrates in the TBPO-HO system. The obtained results indicate that the TBPO-HO binary system has a potential for application in gas separation and as cold storage and transportation media.

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Section: Introductionmentioning

confidence: 99%

Semiclathrate Hydrates in Tri-n-butylphosphine Oxide (TBPO)–Water and TBPO–Water–Methane Systems

et al. 2017

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“…While in the case of the simulated biogas mixture hydrate formed with TBAB-DMSO, the peak at 1286 cm À1 was observed shift to 1278 cm À1 except that the peak at 1381 cm À1 was the same position as that of the THF-DMSO case. It is well known that Raman peaks at 1278 cm À1 and 1381 cm À1 should correspond to CO 2 occupies both 5 12 6 2 and 5 12 6 3 cages of the semiclathrate hydrate framework [14,49,51]. It should be noted that the relative intensity of peak splitting at 1307 cm À1 and 1326 cm À1 are likely corresponding to a change in the structural environment of the alkyl groups and can be attributed to CH 2 -bending modes in this spectral region [52].…”

Section: Resultsmentioning

confidence: 94%

“…The kinetic and separation experimental procedures used in this work were described elsewhere [14,25], except for an additional in situ Raman analyzing for the mixture hydrate framework. For every experimental run, CR was firstly filled with 140 mL aqueous additive solution and pressured with the simulated biogas to the desired pressure.…”

Section: Methodsmentioning

confidence: 99%

Hydrate-based CO2 capture and CH4 purification from simulated biogas with synergic additives based on gas solvent

Xia

Chen

et al. 2016

Applied Energy

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“…The potential of semi-clathrate hydrates as gas separation media has been evaluated for a number of systems, however, their properties and characteristics are still not well known. 13,15,16,18,[26][27][28][29] Factors that affect the separation characteristics of TBA salt species for mixture gases are also not known, therefore, it is difficult for the separation technology to be further advanced without new measurements or simulations.…”

Section: Introductionmentioning

confidence: 98%

Hydrogen and carbon dioxide adsorption with tetra‐n‐butyl ammonium semi‐clathrate hydrates for gas separations

Komatsu¹,

Ota

Satō

et al. 2014

AIChE Journal

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Gas adsorption rates of H 2 , CO 2 , and H 2 -CO 2 gas mixture (H 2 /CO 2 5 3.4) with tetra-n-butyl ammonium salt (bromide, chloride, and fluoride) semi-clathrate hydrate particles were measured at 269 K to assess their properties for gas separation. Equilibrium gas occupancies in the S-cages of the particles were in order of (high to low) for hexagonal structure-I, tetragonal structure-I, and superlattice of cubic structure-I structures with the maximum fractional occupancy by CO 2 being about 40%. The CO 2 diffusion rate depended on the anion size of the salt, which is attributed to distortion of the S-cage that is close to the molecular size of CO 2 . Simulations of semi-clathrate hydrate particles with theory showed that H 2 /CO 2 selectivities could be as high as 36 (3.0 mol% TBAF) and that selectivities for an ideal membrane (3.3 mol% TBAF) could be >100 (269 K, 0.3-4.5 MPa). Semi-clathrate hydrates have wide application as separation media for gas mixtures.

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CO2 (carbon dioxide) separation from CO2–H2 (hydrogen) gas mixtures by gas hydrates in TBAB (tetra-n-butyl ammonium bromide) solution and Raman spectroscopic analysis

Cited by 114 publications

References 27 publications

Semiclathrate Hydrates in Tri-n-butylphosphine Oxide (TBPO)–Water and TBPO–Water–Methane Systems

Semiclathrate Hydrates in Tri-n-butylphosphine Oxide (TBPO)–Water and TBPO–Water–Methane Systems

Hydrate-based CO2 capture and CH4 purification from simulated biogas with synergic additives based on gas solvent

Hydrogen and carbon dioxide adsorption with tetra‐n‐butyl ammonium semi‐clathrate hydrates for gas separations

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