Question

The relative volatility, defined below, is often used as a simple way to relate the liquid and vapor compositions for a binary system. This worksheet examines the impact of relative volatility on the split between two components in a batch distillation process. An equimolar mixture of A and B is charged to a still. The mixture is distilled until 50% of A (the more volatile component) is vaporized a) Species A and B are present in a batch distillation still. The relative volatility (CAB) can be considered constant. Starting with the Rayleigh Equation, derive an expression that relates (MA/MAo) to (MB/MBo) and AB, where A and B refer to two species in the still and MAo and MBo are the initial moles in the still. Hint: Start with the following: dt dt dMB a - -DyDB dt dt dMA dMB DyDA DyDB

Answer 1

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