Question

Most distillation columns are designed for reflux ratio between

(a) 3 to 5  Rmin

(b) 1.2 and 1 .7 Rmin

(c) 2  to 10 Rmin

(d) 0.2 to 0.7 Rmin

The question was asked in an interview for job.

The above asked question is from Reflux Stage Relationships in portion Column Process Design, Optimization and Shortcut Calculations of Distillation Design

Answer 1

The correct option is (b) 1.2 and 1 .7 Rmin

Easiest explanation: This is the most suitable for 1.2 and 1.7 Rmin times reflux ratio, this also reduces the operating and the final cost of the system.