CRI - Critical Data of Mixtures

The CRI data file first became available in 2002 and was constructed to support research on equations of state (EOS).

The critical behavior of mixtures as function of temperature provides very important information for the test of EOS and their mixing rules. Besides that, the correct prediction of the critical locus is critical for the design of many chemical processes.

In the vicinity of the critical point, the PvT behavior changes drastically as function of temperature or pressure and an erroneous prediction of the critical properties can easily have devastating effects on process design.

A full list of available systems is available in our DDB Online Search system. The page might take some seconds to load because of its size.

As an example, the critical temperature in the mixture ethanol (1) - hexane (2) is shown in the diagram below. At equimolar composition, a critical temperature of about 489 K was found. Assuming ideal mixture behavior, a value of about 510 K would have been expected. This means, that the strong changes in compressibility of the mixture appear more than 20 K lower due to the real mixture behavior.

The following picture shows the pure component ethane at its critical temperature as well as 0.5K below and above. The sapphire cell in this photo was also used to determine the critical data of mixtures for a number of binary systems stored in the DDB-CRI data bank.

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Selected Scientific Papers

2002    Measurement and Calculation of Critical Points for Binary and Ternary Mixtures    Horstmann S., Fischer K., Gmehling J.    Journal    AIChE J., 48, 10, 2350 2356 (2002)
2000    Experimental Determination of the Critical Line for (Carbon Dioxide + Ethane) and Calculation of Various Thermodynamic Properties for (Carbon Dioxide + n-Alkane) using the PSRK Model    Horstmann S., Fischer K., Gmehling J., Kolar P.    Journal    J.Chem.Thermodyn., 32, 7, 451 464 (2000)

Selected Scientific Papers (Experimental Data)

2001    Experimental determination of critical data of mixtures and their relevance for the development of thermodynamic models    Horstmann S., Fischer K., Gmehling J.    Journal    Chem.Eng.Sci., 56, 10, 6905 6913 (2001)
1999    Experimentelle Bestimmung von kritischen Punkten reiner Stoffe und binaerer Mischungen mit einer Durchflussapparatur    Horstmann S., Fischer K., Gmehling J.    Journal    Chem.Ing.Tech., 71, 7, 725 728 (1999)
1999    Experimental Determination of Critical Points of Pure Components and Binary Mixtures Using a Flow Apparatus    Horstmann S., Fischer K., Gmehling J.    Journal    Chem.Eng.Technol., 22, 10, 839 842 (1999)