Abstract: New data on the composition of hexagonal structure III (sH) diethylamine+methane double hydrate are presented. The hydrate was synthesized from methane and aqueous solutions of diethylamine with the molar ratio of diethylamine to water 1:17, 1:20, 1:30, 1:40, and 1:50. In the first case, pure sH hydrate was obtained; in other cases, the mixtures of sH hydrates and methane hydrate were formed. The content of each of the hydrates in mixture as well as the total content of methane in these samples were determined experimentally. The compositions of the formed sH hydrates in all samples were calculated on the basis of these data. It turned out that in all samples, substantial part of large cavities of sH hydrate framework was filled with two diethylamine molecules. To the best of our knowledge, this is the first example of double occupancy of hydrate cavities for gas hydrate synthesized at comparatively low (100 bar) pressure. Multiple filling of the hydrate cavities by guest molecules was previously observed only at pressures above 1000 bar.

Cite: Chashchin D.D. , Manakov A.Y. , Yunoshev A.S.
Double occupancy of large cavity of diethylamin+methane sH hydrate at low pressures
Structural Chemistry. 2020. V.31. N3. P.1113-1118. DOI: 10.1007/s11224-020-01492-1 WOS Scopus РИНЦ OpenAlex

Dates:

Submitted:	Nov 3, 2019
Accepted:	Jan 15, 2020
Published online:	Jan 21, 2020

Identifiers:

Web of science:	WOS:000529701400024
Scopus:	2-s2.0-85078111506
Elibrary:	43237099
OpenAlex:	W3001091493

Citing:

DB	Citing
OpenAlex	2
Elibrary	2
Scopus	2
Web of science	2

Altmetrics: