Vapor pressures of liquid oxygen between the triple point and critical point

1968 ◽  
Vol 13 (2) ◽  
pp. 262-264 ◽  
Author(s):  
Gerald T. Brower ◽  
George. Thodos
Keyword(s):  
Critical Point ◽  
Triple Point ◽  
Liquid Oxygen ◽  
Vapor Pressures

PRELIMINARY STUDY OF THE FRACTIONATION OF ISOTOPIC ISOMERS BY DISTILLATION

1935 ◽  
Vol 13b (2) ◽  
pp. 114-121 ◽  
Author(s):  
D. F. Stedman
Keyword(s):  
Vapor Pressure ◽  
Boiling Point ◽  
Atomic Weight ◽  
Liquid Oxygen ◽  
Vapor Pressures ◽  
Normal Concentration ◽  
Short Run ◽  
Total Separation ◽  
Preliminary Study

Slight separations of some isotopic isomers have been achieved by equilibrium rectification. In the case of chlorine the total separation amounted to 0.048 atomic weight units; 28.6% of the O18 has also been removed from normal oxygen by the fractionation of water, and in a short run with liquid oxygen the normal concentration of O18 has been raised from 0.2% to 0.25%. The last-mentioned separation can be carried considerably further with present equipment.CH3D was synthesized. Its boiling point appears to be 0.5 °C. lower than that of methane.The vapor pressures of a 56.8% solution of D2O were measured, and it is suggested that the published values of the vapor pressure of D2O at temperatures lower than 40 °C. may be slightly too high.

Three-parameter correlation for the surface tension of saturated liquids

2020 ◽  
Vol 34 (11) ◽  
pp. 2050107 ◽  
Author(s):  
Qiuju Chen ◽  
Jianxiang Tian ◽  
Hua Jiang
Keyword(s):  
Surface Tension ◽  
Critical Point ◽  
Triple Point ◽  
High Accuracy ◽  
Economic Benefits ◽  
Operating Conditions ◽  
Simple Liquids ◽  
Parameter Correlation ◽  
Multiple Parameter ◽  
Better Than

In this paper, we study the multiple-parameter correlations for the surface tension of saturated liquids. The proposed three-parameter correlation requires only the critical temperature as inputs and is tested by using the NIST REFPROP data for 72 saturated liquids including refrigerants, alkanes and some other simple liquids such as argon, carbon dioxide, etc. It is found that this correlation well stands in the whole temperature range from the triple point to the critical point with high accuracy for 71 liquids with average absolute deviations (AADs) less than 5% and for 66 liquids with AADs less than 1%. These results are clearly better than the ones of other available correlations. This correlation can be directly used to estimate the value of the surface tension of the corresponding liquids at any temperature point from the triple point to the critical point. The accuracy of the predictions would clearly have economic benefits since it would allow improvement of process operating conditions, the development of new processes, the reduction of oversizing in the design of new equipment and even reduction of energy requirements.

Some Thermodynamic Properties of Pure and Impure Nitrogen

1974 ◽  
Vol 52 (16) ◽  
pp. 1521-1531 ◽  
Author(s):  
J. Ancsin
Keyword(s):  
Thermodynamic Properties ◽  
Triple Point ◽  
Boiling Point ◽  
Normal Boiling Point ◽  
Vapor Pressures ◽  
Freezing Points ◽  
Boiling Points ◽  
Triple Points

Boiling points, freezing points, and vapor pressures (from 56 K to the normal boiling point) for pure and various doped N2 samples have been measured. The normal boiling points for N2 and N2 doped with 100 v.p.p.m. of O2, Ar, Kr, and CO impurities were found to be 77.3439 K, 77.3458 K, 77.3452 K, 77.3454 K, and 77.3444 K respectively. The triple points of the same samples are 63.14635 K, 63.1445 K, 63.14575 K, 63.1487 K, and 63.14675 K respectively. The values obtained for the heats of sublimation, vaporization, and fusion at the triple point of pure N2 were 6773.8, 6049.6, and 724.3 J/mole respectively and the above impurities changed these quantities by the amounts given in Tables 5 and 6.

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