Vapour pressures of isobutane at T= (310 to 407) K

Critical parameters for isobutane determined by the image analysis

“…Comparison of the vapor pressure measurements for isobutane Pressure deviation of the experimental data by Miyamoto et al[1] from mean values of the present measurements given in table 1.…”

“…The sample to be loaded was degassed five times by freeze-thaw cycling with liquid nitrogen before loading. The sample loaded in this study is supplied by the same cylinder as the previous work [1,2] used.…”

“…In previous publications [1,2] we reported measurements of thermodynamic properties of isobutane in the compressed liquid phase between the temperatures (280 and 440) K at pressures up to 200 MPa by a metal-bellows variable volumometer. In this paper, the results of (p, q, T) measurements and visual observations of the meniscus for isobutane in the critical region using an optical cell and a metal-bellows volumometer are presented.…”

Measurements of Vapor Pressures from 280 to 369 K and (p, ρ, T) Properties from 340 to 400 K at Pressures to 200 MPa for Propane

“…The measurements of this study were carried out using the same apparatus as employed in previous work [1,2]. The experimental procedures are described in detail elsewhere [13].…”

“…In previous publications [1,2] we reported measurements of the vapor pressure and ( p, ρ, T ) properties for isobutane by a metal-bellows variable volumometer at temperatures from 280 to 440 K at pressures up to Reamer [3] 306 Mercury piezometer 0.1-69 1-576 311-511 Dittmer [4] 336 Isochoric method 1.0-103 320-590 273-413 Ely [5] 222 Isochoric method 0.3-43 508-652 166-324 Thomas [6] 736 Mercury piezometer 0.6-40 35-549 258-623 Haynes [7] 196 Magnetic suspension densimeter 0.6-37 493-741 90-300 Kratzke [8] 60 Isochoric method 2.2-61 441-565 247-491 Straty [9] 144 Burnett expansion (isochoric) 0.2-35 2-347 363-598 Claus [10] 130 Single-sinker densimeter 2.0-30 24-506 340-520 Glos [11] 72 Two-sinker densimeter 0.2-12 3-727 95-340 Kayukawa [12] 200 MPa. In this paper, the results of (p, ρ, T) measurements for propane using the same apparatus are presented for the compressed liquid phase for temperatures from 340 to 400 K at pressures up to 200 MPa.…”