Abstract
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.
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