What property calculation method should be used to determine the densities of pure gases and liquids of H2, CO, CO2, and N2 at 20 degrees Celsius?
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What property calculation method should be used to determine the densities of pure gases and liquids of H2, CO, CO2, and N2 at 20 degrees Celsius?
Any standard equation of state will do, such as PR, SRK, etc. However, when it comes to calculating density, software like A+ tends to have significant errors, especially under high pressure and low temperature conditions; therefore, it is recommended that the poster consult relevant manuals! This post was last edited by windows98 on 2009-3-4 at 09:26.]
I usually start by checking the manual to select a standard value, such as 300K or 1000KPa, and see what the value is specified in the manual. Then I use different models for calculations to determine which one gives more accurate results, and I use that model to compute the values that are not listed in the manual. General manuals do not provide density values accurate to each degree or KPa; choosing a model based on such manuals yields fairly reliable calculations.