Abstract
Continuous thermodynamics is a convenient method for the calculation of complex multicomponent distillation. To perform the calculations an efficient and fast computer program is established. The expense using continuous thermodynamics proves to be approximately the half of the expense using the pseudocomponent method. The effect of feed properties, column construction, and operation conditions on the calculated results is investigated showing that the real behavior of the liquid phase and the enthalpy balance have no significant influence on the calculated temperatures and distribution functions if the mixtures contain only or mainly hydrocarbons. Therefore, it is possible to separate approximately the problem of the temperatures and distribution functions at the stages from the problem of the flows at the stages. In this way the expense decreases to a third.
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