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Critical temperatures and pressures of substances from vapor pressure data
Author(s) -
Stiel Leonard I.,
Thodos George
Publication year - 1962
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450400606
Subject(s) - thermodynamics , critical point (mathematics) , vapor pressure , frost (temperature) , chemistry , reduced properties , materials science , mathematics , physics , mathematical analysis , composite material
A method has been developed for the prediction of the critical temperature and pressure of any pure substance from its reliable vapor pressure data. These data are used to determine the constants A, B, C , and D of the substance for the Frost‐Kalwarf equation. The critical temperature of the substance is then calculated from the constants B and C . The critical pressure is calculated by substituting the values of A, B, C , and the calculated critical temperature into the Frost‐Kalwarf equation applied at the critical point. This approach was used to calculate critical constants for 64 non‐hydrogen bonding substances of all types which were primarily hydrocarbons. An average deviation of 0.59% resulted for the critical temperature and 3.18% for the critical pressure.