【Help Request】Question about reaction heat
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I want to use Aspen’s RStoic reactor to verify the reaction heat of the reaction shown in the figure below. The reaction conditions are 25°C and 1 bar, with the molar fractions of the feed to the reactor being C:1, O2:0.5. The calculation results are shown in the figure below. In S1 logistics, all substances are elements; then why isn’t the enthalpy value 0? Based on this result, how should the reaction heat be calculated?
Set C as a solid, check the option to calculate the reaction heat in the metering reactor; set the feed conditions to 25°C and 1 bar, and also set the reactor conditions to 25°C and 1 bar. The resulting reaction heat is 110.5 kJ/mol, based on C.
There are instruments for direct testing; our company purchased one for research and development, which allows for direct testing
Enthalpy does not have an absolute meaning but only a relative one; the enthalpy in that flow stream is the enthalpy difference relative to a reference condition (I believe it’s 15°C and 101.33 kPa). Whether it is a simple substance or not has little to do with the enthalpy value.