Question

In a distillation operation, the reflux ratio may vary between

(a) Zero and one

(b) Zero and infinity

(c) Minimum and infinity

(d) One and two

This question was addressed to me in unit test.

This key question is from Reflux Stage Relationships in section Column Process Design, Optimization and Shortcut Calculations of Distillation Design

Answer 1

Correct choice is (a) Zero and one

To elaborate: L0/D Varies from zero to one, as the ratio cannot be more than one because that will cause the failure of the column.