PVT Property Measurements for Liquid 1,2-Dichloro-1,2,2-trifluoroethane from 278 to 338 K

Abstract

The effect of pressure on the volume of liquid 1,2-dichloro-1,2,2-trifluoroethane (R123a) has been measured relative to the volume at 0.1 MPa with a bellows volumometer for pressures up to 380 MPa over the temperature range (278.15 to 298.14) K and up to about 275 MPa for (313.14 to 338.13) K. The experimental volume ratios have been represented by equations to enable interpolation and extrapolation of volumetric properties. Isothermal compressibilities, isobaric expansivities, internal pressures, and the change in isobaric heat capacity from its value at 0.1 MPa have been calculated. Although there are similarities between these properties and those of 2,2-dichloro-1,1,1-trifluoroethane (R123), there are differences, indicating the effects of the greater asymmetry of the molecular structure of R123a.

Solubility Differences of Halocarbon Isomers in Ionic Liquid [emim][Tf2N]

“…HCFC-123b was, however, not obtainable from any source and not easily synthesized, so it was not included in this study, although it would be interesting to know how this compound interacts with ionic liquids such as [emim][Tf 2 N], particularly because the normal boiling point is somewhat different from the other isomers (HCFC-123, T b ) 300.97 K; HCFC-123a, T b ) 301.35 K; and HCFC-123b, T b ) 303.35 K). [37][38][39][40][41][42][43][44] The present VLE data (CFC-114, HCFC-124, and HFC-134 isomers) have been well correlated using our EOS model 19,22 (see Supporting Information for details) which was used to make predictions of LLE behavior. The measured LLE data for the low-pressure halocarbons (CFC-113 and HCFC-123 isomers) have been well correlated using the nonelectrolyte NRTL solution model 13,23,24 (see Supporting Information for details).…”

“…Also, it should be noted that three isomers exist for HCFC-123 (CHCl 2 −CF 3 , HCFC-123; CHClF−CClF 2 , HCFC-123a; and CHF 2 −CFCl 2 , HCFC-123b). HCFC-123b was, however, not obtainable from any source and not easily synthesized, so it was not included in this study, although it would be interesting to know how this compound interacts with ionic liquids such as [emim][Tf 2 N], particularly because the normal boiling point is somewhat different from the other isomers (HCFC-123, T b = 300.97 K; HCFC-123a, T b = 301.35 K; and HCFC-123b, T b = 303.35 K). − …”