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a) There are two designs of distillation columns with same inlet & outlet rates and compositions. Column 1 has reflux ratio of 4 while Column 2 has a reflux ratio of 12. Which column has: i. Smaller diameter? ii. Less heat required for the reboiler? b) What does it mean to have total reflux? c) In distillation columns, each tray usually has an overflow weir on it to control the height of liquid on that tray, (as shown in the picture below). What is the major advantage to have a higher overflow weir? Ciquid Werflow weer T vapor

a) There are two designs of distillation columns with same inlet & outlet rates and compositions. Column 1 has reflux ratio of 4 while Column 2 has a reflux ratio of 12. Which column has: i. Smaller diameter? ii. Less heat required for the reboiler? b) What does it mean to have total reflux? c) In distillation columns, each tray usually has an overflow weir on it to control the height of liquid on that tray, (as shown in the picture below). What is the major advantage to have a higher overflow weir? Ciquid Werflow weer T vapor

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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a) There are two designs of distillation columns with same inlet & outlet rates and compositions. Column 1 has reflux ratio of 4 while Column 2 has a reflux ratio of 12. Which column has: i. Smaller diameter? ii. Less heat required for the reboiler? b) What does it mean to have total reflux? c) In distillation columns, each tray usually has an overflow weir on it to control the height of liquid on that tray, (as shown in the picture below). What is the major advantage to have a higher overflow weir? Ciquid Werflow weir T vapor
Transcribed Image Text:a) There are two designs of distillation columns with same inlet & outlet rates and compositions. Column 1 has reflux ratio of 4 while Column 2 has a reflux ratio of 12. Which column has: i. Smaller diameter? ii. Less heat required for the reboiler? b) What does it mean to have total reflux? c) In distillation columns, each tray usually has an overflow weir on it to control the height of liquid on that tray, (as shown in the picture below). What is the major advantage to have a higher overflow weir? Ciquid Werflow weir T vapor
Expert Solution
Distillation Column reflux

Distillation is the process of separating two components of the mixture based on the differences in their boiling points.

Reflux: It is amount of liquid condensate that is fed back into distillation column.

Reflux ratio: It is the ratio of amount reflux to the overhead product or amount reflux to the vapour.

a) More is the reflux ratio greater will be the diameter required for the distillation column.

(i) Hence column 1 has smaller diameter

(ii) Column 1 has less heat requirement for reboiler.

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