Joback Group Contributions for Critical Constants

TABLE 2 337 Joback Group Contributions for Critical Constants 

Required input data From the DIPPR 801 database, Tb = 417.58 K. From Table 2-337  

Property DIPPR 801 recommendation Joback estimation % Difference 

Example Estimate the critical constants of sec-butanol by using the Joback method. 

Required input data From DIPPR 801 database, Ti = 372.7 K, M = 74.1216 kg/kmol. 

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Input data Molecular structure and one measured vapor pressure value P)),eas, (often at a low pressure). The method requires estimation of and using a group contribution method. The original Pailhes method used the Lytrerson method [Lydersen, A. L., AlChE 21 (1975) 510], but the Joback method is illustrated here for consistency with the previous examples on critical constant estimation. 

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