Liquid-vapor phase equilibrium in solutions of oxygen and nitrogen at pressures below one atmosphere

Abstract

A cryostat and equilibrium vessel, together witI: auxiliary ap.p~ratus for. establis hi~lg equilibrium between liquid and vapor pl.1~s e~ of SOlutlO!lS of low bOllmg mat~nll;ls by a ?ll'-culation method, is described. The eqUllIbnum vessel mcorporates a n ovell~qUld samplmg device. Vapor and liquid compositions and t otal ;;apo~ press Ul'~s of s o,lubons. <!f oxyge.n and nitr ogen were measured along isotherm s at 77.5 ,70 and 65 K . 1he actIvIty coefflcients of nitrogen and oxygen may be represented by equations of t he forlll in which AI2 in cal /cm 3 rnoic has the values 1.22 at 77.5°, 1.38 at 70°, and 1. 47 at 65° IeThe deviations of the solutions from ideality a re much less t han is to be ex pected of regular s olutions, in which the interaction e nergy betwecn unlike molecules follows a geometric mean law. The data are not entirely consistent with the assu mpt ion t hat molar volum e ar e additive in t he solu tions.

Addition of the Sulfur Dioxide Group (SO2), the Oxygen Group (O2), and the Nitric Oxide Group (NO) to the E-PPR78 Model

“…Table lists the 23 pure components involved in this study. The pure fluid physical properties ( T c , P c , and ω) that were used in this study, originate from Poling et al Table details the sources of the binary experimental data ,− used in our evaluations, along with the temperature, pressure, and composition ranges for each binary system. Most of the data available in the open literature were collected.…”

Thermodynamic models for vapor–liquid equilibria of nitrogen+oxygen+carbon dioxide at low temperatures

“…Regarding the three binary subsystems, the available experimental data base is much better and extensive VLE data can be found. For N 2 +O 2 , which consists of the two lower boiling components of the present ternary mixture, 15 publications are available [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Both components have very low critical temperatures, i.e.…”