Chapter 1 - Critical properties and acentric factor—Organic compounds

Abstract

This chapter presents the critical properties and acentric factor of organic compounds in tabular form. The tabulation is arranged by carbon number such as C, C2, and C3 to provide ease of use in quickly locating the data by using the chemical formula. The compound name and chemical abstracts registry number (CAS No) are also provided in columns. Values for freezing point, boiling point, critical temperature, pressure, volume, density, and compressibility factor are given in the adjacent columns. The code for each property is also given in columns and the last column provides the acentric factor. The compilations of CRC, Daubert and Danner, Dechema, TRC, Vargaftik, and Yaws are used extensively for critical properties. Estimates of critical temperature, pressure, and volume are primarily based on the Joback method. Critical density is determined from dividing molecular weight by critical volume. Critical compressibility factor is ascertained from application of the gas law at the critical point. Estimates for acentric factor are primarily made by using the Antoine equation for vapor pressure. A comparison of calculated and data values for critical temperature is also presented for normal alkanes. The graph shows favorable agreement of equation and data.