Yi

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Figure 10 Temperature profile for the example shown in Figure 7 (continuous line) compared with various linear boiling point approximations.

Bottom Stages Top

Figure 10 Temperature profile for the example shown in Figure 7 (continuous line) compared with various linear boiling point approximations.

Alternatively, if we are using relative volatilities we may find the temperature via the vapour pressure of the reference component. If we use the Antoine equation, then we have an explicit equation:

Br log pO-Ar

This last expression is a very good approximation to a solution of the nonlinear eqn [51]. An illustration of how the different approximations behave is shown in Figure 10. For that particular case (a fairly ideal mixture), eqns [53] and [54] almost coincide.

In a rigorous simulation of a distillation column, the mass and energy balances and the VLE have to be solved simultaneously for all stages. The temperature is then often used as an iteration parameter in order to compute the vapour pressures in VLE computations and in the enthalpy computations of the energy balance.

Solar Panel Basics

Solar Panel Basics

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