The important thing to note is that the addition of

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: reboiler increases the distance between the equilibrium curve and the operating lines for Sections 2 and 3 so that the steps in Sections 2 and 3 accomplish larger composition changes. Exercise 7.38 (continued) Analysis: Addition (continued) Exercise 7.39 Subject: Distillation of a mixture of para-dichlorobenzene (P) and ortho-dichlorobenzene (O), two close-boiling isomers, using the McCabe-Thiele diagram, with the Kremser equation to accurately calculate the separations at the two ends of the column. Given: Feed of 62 mol% P and 38 mol% O that is slightly vaporized with q = 0.9. Distillate is liquid of 98 mol% P. Bottoms is 96 mol% O. Pressures at top and bottom are 20 psia and 15 psia, respectively. Reflux ratio, R = 1.15 times minimum. Assumptions: Constant molar overflow. Total condenser and partial reboiler. Average relative volatility based on Raoult's law. Find: Number of theoretical stages from McCabe-Thiele diagram, using Kremser supplement for the two ends of the column. Analysis: From a simulation program or handbook, the temperatures at the top and...
View Full Document

This note was uploaded on 09/08/2008 for the course CHE 244 taught by Professor Selebi during the Spring '06 term at Lehigh University .

Ask a homework question - tutors are online