Enclathration of 2,3,3,3-Tetrafluoropropene into Structure-II Hydrate with Methane

Autor:	Shunsuke Hashimoto, Kazunari Ohgaki, Takeshi Sugahara, Teruo Kido, Yoshito Katsuta
Rok vydání:	2013
Předmět:	Aqueous solution Ternary numeral system Chemistry General Chemical Engineering Clathrate hydrate Inorganic chemistry General Chemistry Methane chemistry.chemical_compound Phase (matter) Physical chemistry Binary system Hydrate Difluoromethane
Zdroj:	Journal of Chemical & Engineering Data. 58:2596-2599
ISSN:	1520-5134 0021-9568
DOI:	10.1021/je400481r
Popis:	The enclathration of 2,3,3,3-tetrafluoropropene (HFO-1234yf) has been investigated. In the binary system of HFO-1234yf+H2O, simple HFO-1234yf hydrate is not formed even at 50 MPa and 274.15 K. The addition of methane (CH4) as a help molecule results in the structure-II CH4+HFO-1234yf mixed-gas hydrate formation. With difluoromethane (HFC-32), instead of CH4, no HFC-32+HFO-1234yf mixed-gas hydrate is formed. Isothermal phase equilibria for the CH4+HFO-1234yf+H2O ternary system were measured at 279.15 K. Based on the extrapolation of two three-phase {(hydrate, aqueous, and gas phases) and (aqueous, HFO-1234yf-rich liquid, and gas phases)} equilibrium curves, the quadruple point of hydrate, aqueous, HFO-1234yf-rich liquid, and gas phases was determined.
Databáze:	OpenAIRE
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