Azeotropes cannot be found in Aspen
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In the book, it is stated that tetrafluoroethylene and difluoromethane exist as an azeotrope, but this cannot be found in Aspen; is it because there are no interaction parameters?
Check the temperature and composition data for both using NIST, and try performing a regression
There is no experimental data in NIST: L
Without experimental data, it can only be estimated using methods such as group contribution
If it is crucial for your project to determine whether an azeotrope exists in the tetrafluoroethylene/difluoromethane system and to obtain gas-liquid equilibrium data, and such information cannot be found in authoritative manuals or other sources, it is recommended to commission experimental measurements from universities that have expertise in the determination and evaluation of fundamental thermodynamic data, such as East China University of Science and Technology and Tianjin University.
The azeotrope compositions of both have been calculated, but the experimentally determined azeotrope compositions could not be found to verify the calculation results
This might not be realistic; the funding doesn’t support it. Vapor-liquid equilibrium data have been estimated so far, but there is no experimental data for comparative verification
1. Is there a parameter for binary interaction that can be used to determine this?； 2. Accurate simulation: It is important to choose the right property method; check your property method. ——In some systems, only one specific physical property can be accurately simulated
An intermittent distillation experiment can be conducted directly, and the azeotrope can be obtained under full reflux conditions
The experiment is not practical; it needs to be carried out under high pressure, as the vapor pressures of these two substances are very low. No experimental conditions
Check whether their binary interaction parameters exist; as long as they do, it is still possible to make a fairly confident calculation.