The would increase the number of stages by about half

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: er the temperature of the interreboiler stage to 162oC. Exercise 7.37 (continued) Analysis: (continued) Alternative unit with Interreboiler: Exercise 7.38 Subject: Effect of the addition of an intercondenser and interreboiler to a distillation column separating n-butane and n-pentane. Given: Distillate and bottoms compositions of actual operation (before addition of intercondenser and interreboiler) compared to design specification. Assumptions: Constant molar overflow. Constant relative volatility. Column is large enough in diameter to handle increased reflux and boilup. Raoult's law (ideal solutions and ideal gas law). Find: Whether the addition can improve the operation because of the increased reflux and boilup produced by the intercondenser and interreboiler. Analysis: First, estimate the average relative volatility for nC4/nC5. Assume a distillate temperature of 120oF so that cooling water can be used in the condenser. This corresponds to a saturation pressure of about 70 psia. Using Fig. 2.8...
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