Please help, why are liquefied gas simulations solved using the PR equation? ? ?
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Why are light hydrocarbon simulations solved using the PR equation? ? ? ?
This post was last edited by LTY on 2009-8-5 15:12. I think the model idea of cubic state equations such as SRK PR is more suitable for non-polar hydrocarbons, while for non-polar hydrocarbons, the "local composition" model requires the use of activity coefficient equations. PR has its own equation form, but it is not called an equation here. It is called a thermodynamic method in proii, and a property method in ASPEN, because many physical properties need to be calculated for simulation. Not all physical properties use PR, but PR is a dominant equation, just like the process major of the design institute, so it is just named after it here.
SRK and PR are more suitable for non-polar light hydrocarbon systems, but they are not very accurate for those with large hydrogen content. For example, ethylene plant proii recommends srk.
The PR equation is suitable for medium to high pressure and medium to high temperatures.
Non-polar systems such as hydrocarbons can use equations of state, such as SRK/PR/PT, etc., and the activity coefficient model is suitable for polar systems. However, the advantage of the equation of state over the activity coefficient model is that it can be used in high-pressure systems, while the activity coefficient model is no longer used when the pressure is very high.