Calculation of the compressibility factor for mixed gases
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Dear sea friends, the media contained within our reactor include hydrogen, ethane, ethylene, propane, propylene, 1-butene, etc. The formula provided by the patent holder for calculating the compressibility factor of the gases in the reactor is as follows: where the values within square brackets represent the percentage content of each medium in the mixed gas； P and T are the pressure and temperature of the reactor. My questions are: 1. The impact of propane and butylene on the compressibility factor is not reflected in the calculation formula; is this correct? Or is the impact of the propane and butene contents on the compressibility factor of the mixed gas minimal, and thus ignored? 2. Could some expert please explain the derivation process of this formula to help us understand it better? Thank you to all the sea friends!
It definitely has to be counted. It is possible to look up and calculate the compressive entropy of various substances. But I’m also a bit puzzled.
It is recommended to compare process simulation software results with actual outcomes; generally, the compressibility factor is calculated using such software.
Thank you for your help. Here, in the complex control loops of the reactor, it is necessary to dynamically calculate the compressibility factor based on changes in the gas composition within the reactor. The foreigners provided a formula for this calculation, and we would like to understand how this formula was derived
This post was last edited by 2005011lcj on 2021-2-20 at 11:26. This formula certainly wasn’t derived; it’s likely to have been fitted based on existing data. Below are the calculation results from the chemical engineering calculation app.
Thank you for answering my questions. The compressibility factor of a mixed gas should be theoretically calculable, right? I found some methods online, but I still don’t quite understand them
It seems quite easy to understand: propane and butylene meet the value of 0.144963, while the presence of other light components causes a positive deviation from this value, which is then corrected based on concentration.
Hearing you say that, it seems to be the case indeed. But what interests me even more is how this formula was derived.
Can you send me this software app?