How can one use Aspen to estimate the standard molar entropy of formation of a substance?
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As the title says. Aspen can provide the standard molar enthalpy of formation and Gibbs free energy, and these values are generally in agreement with those in the literature. I’m not sure what the sign for the entropies of formation is; the value of S in the property analysis does not match SIG at all, and I’m not quite understanding this. Moreover, the literature often mentions that this value is estimated using the Benson method; could you please explain how to do that? Provide a specific example. Such as methanol. Thank you
For my case with ASPEN7.2, I think I need to draw a stream in the flowsheet, select the method for component properties, then go to Tools-Analysis-property-pure; there I choose S and perform the calculation, and that should work
This method is incorrect. After studying the literature, it is possible to calculate directly using the group contribution method, or using the ASPEN method; however, I still haven’t mastered it.
This is what I did, and the result was incorrect. Through research and by consulting literature, it is indeed possible to calculate the group contribution values directly; however, the BENSON method requires calculating molecular symmetry, which is rather complicated and involves the use of Gaussian software. I still haven’t found a direct calculation method for Aspen.
This is what I did, and the result was incorrect. Through research and by consulting literature, it is indeed possible to calculate the group contribution values directly; however, the BENSON method requires calculating molecular symmetry, which is rather complicated and involves the use of Gaussian software. I still haven’t found a direct calculation method for Aspen.