Homo-molar flow assumption
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When oils are distilled in a distillation tower, the rising vapor should cause the heavier components to condense, while the descending liquid should allow lighter components to evaporate; in addition, there are also side draws. How can this satisfy the assumption of constant molar flow?
Rising vapor should cause heavier components to condense, while descending liquid will have lighter components evaporate. This is backmixing; it’s a problem related to the ratio of theoretical plates to actual plates (packing height). Extracting it via the side line certainly doesn’t work, so we perform calculations in segments.