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Separation Process Engineering: Includes Mass Transfer Analysis, Third Edition by Phillip C. Wankat

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Appendix A. Aspen Plus Troubleshooting Guide for Separations

Although specific for Aspen Plus, many of these suggestions will be helpful for other simulators. If Aspen Plus is too slow, close other programs and close extra windows within Aspen Plus. If none of the correlations fit the equilibrium data, see Appendix B. 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 ...

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