Thermodynamic inhibition of 4-methylmorpholine while forming sH hydrate with methane

Park, Seongmin; Kang, Hyery; Lim, Dongwook; Lee, Jong-won; Seo, Yutaek; Lee, Huen

doi:10.1016/j.ces.2015.08.027

Cited by 3 publications

(2 citation statements)

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“…Meanwhile, since Ripmeester et al 3 first discovered sH hydrates, extensive studies have also been carried out to find novel LGMs to stabilize artificial sH hydrate. For example, Shin et al 4 and Park et al 5…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, since Ripmeester et al first discovered sH hydrates, extensive studies have also been carried out to find novel LGMs to stabilize artificial sH hydrate. For example, Shin et al and Park et al recently discovered several LGMs for sH hydrate which are fully miscible in water including hexamethyleneimine, four conformational isomers of methylpiperidine, and N -methylmorpholine. As such, most of these studies have focused on discovering new formers and identifying their effects on the hydrate.…”

Section: Introductionmentioning

confidence: 99%

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Selective Inclusion of Secondary Amine Guests in sH Hydrate Systems

Seol

2021

J. Chem. Eng. Data

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In this study, CH4 hydrate systems containing the six compounds 2,4-dimethylpentane (24DMP), di-isopropyl ether (DIPE), di-isopropyl amine (DIPA), n-pentane, diethyl ether (DEE), and diethyl amine (DEA) were investigated through spectroscopic analyses. According to high-resolution powder diffraction, NMR, and Raman analyses, only the secondary amine molecules of DIPA and DEA are found to be selectively accommodated in sH-L cages. Both DIPA and DEA exhibit no hydrogen bond strongly linked to the host framework, according to the clear “free NH” signals detected from Raman spectra. However, no signals of entrapped 24DMP, DIPE, n-pentane, and DEE are observed, even when mixtures of the additives (e.g., 24DMP + DIPA) are introduced. The equilibrium P–T conditions for CH4 hydrates containing the six additives were also measured. Finally, several hypotheses for interpreting the selective inclusion phenomena are suggested from geometric perspectives of the host framework and the guest molecules, in terms of the van der Waals volume. It should be emphasized that the present findings and interpretations have extended the fundamentals of clathrate hydrates, especially in relation to the unique physicochemical properties and functional usage of sH hydrates.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%