Thermodynamic Stability Boundaries and Structures of Methane + Monohalogenated Cyclopentane Mixed Hydrates

Autor:	Takashi Makino, Kazunari Ohgaki, Yoshito Katsuta, Hiroaki Matsukawa, Young Bae Jeon, Yuuki Matsumoto, Fumitaka Kamo, Takeshi Sugahara, Tatsuya Bando
Rok vydání:	2014
Předmět:	Aqueous solution Chemistry General Chemical Engineering Inorganic chemistry Thermodynamics Bromocyclopentane General Chemistry Crystal structure Atmospheric temperature range Methane chemistry.chemical_compound Chemical stability Hydrate Cyclopentane
Zdroj:	Journal of Chemical & Engineering Data. 59:2294-2297
ISSN:	1520-5134 0021-9568
DOI:	10.1021/je500349v
Popis:	Thermodynamic stability boundaries of the mixed hydrate composed of methane and fluorocyclopentane, chlorocyclopentane, or bromocyclopentane were investigated in a temperature range of (274.17 to 306.19) K and pressures up to 9.93 MPa under the four-phase (hydrate, aqueous, monohalogenated cyclopentane-rich liquid, and gas phases) equilibrium conditions. Also, the crystal structure of the methane + chlorocyclopentane hydrate was determined by means of powder X-ray diffractometry. The each boundary is laid at a pressure lower and a temperature higher than that of the simple methane hydrate. Especially, the methane + fluorocyclopentane hydrate system has the lowest equilibrium pressure among three mixed hydrate systems investigated in the present study. The powder X-ray diffraction patterns reveal that a guest species larger than chrolocyclopentane and smaller than bromocyclopentane is at the border between structure-II and structure-H hydrate formers.
Databáze:	OpenAIRE
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