![]() I basically keep getting these two error messages with different inputs, if the top product is a vapour. When I raise the pressure conditions in the column and feed, Aspen HYSYS says 'a minimum reflux ratio less than 0 has been calculated for '. When I say the top product is vapour, HYSYS tells me 'unable to determine the minimum number of trays in 20 iterations for ' ![]() However, I don't want to liquify CO2, N2, O2, etc, because this costs too much energy and it is completely unnecessary. Using a shortcut column to simulate the separation of butadiene from more volatile species such as CO2, N2, O2, etc.Īspen HYSYS only allows a successful convergence if the top product of the distillation is a liquid.
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