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Separation Process Engineering, Second Edition by Phillip C. Wankat

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Appendix A: Aspen Plus Troubleshooting Guide for Separations

If Aspen Plus is too slow, close other programs and close extra windows within Aspen Plus. If things are not working, check the following:

1. Probably the most common error occurs when specifying streams. You must specify total flow and the composition of each component. The default for composition is molar flows. If the sum of the component molar flows is not equal to the total flow, Aspen Plus still lets you run, but results are often fouled up. Best practice: Always use mole or mass fractions. Another common error is to input the wrong numbers or with the wrong units (e.g., using a feed temperature of 30 K when you mean 30°C. Separation modules won’t work with a feed this cold.) ...

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