HW12 ChE 150B F2009

# HW12 ChE 150B F2009 - and the location of the feed plate...

This preview shows pages 1–2. Sign up to view the full content.

ChE 150B Problem Set 12 Due November 20, 2009 Problem 1. (50 Points) A distillation column is to be designed to separate a mixture of 8 components with the following feed rates at 700 kPa: Compound f i (kmol /hr) C 3 2500 iC 4 400 nC 4 600 iC 5 100 nC 5 200 nC 6 40 nC 7 50 nC 8 40 It is known that the heavy key is iC 5 , which will have a distillate rate of 15 kmol/hr, and the light key is nC 4 , which will have a bottoms rate of 6 kmol/hr. Furthermore, assume for all parts of this problem that only the light key and heavy key distribute; all other components do not distribute. Determine the following: (a) the minimum number of equilibrium stages and the distribution of non-key components by the Fenske equation. (b) the minimum external reflux rate and distribution of non-key components at minimum reflux by the appropriate Underwood equation if the feed is a bubble-point liquid at column pressure. (c) The actual number of stages required for the separation based on the Gilliland correlation

This preview has intentionally blurred sections. Sign up to view the full version.

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

Unformatted text preview: and the location of the feed plate. Hint: You will find the following equation useful: , where P is in psia, T is in o R (Rankine), and the constants are the following: Compound a T1 a T2 a T6 a P1 a P3 C 3-970,688.5626 0 7.15059 -0.76984 6.90224 iC 4-1,166,846 0 7.72668 -0.92213 0 nC 4-1,280,557 0 7.94986 -0.96455 0 iC 5-1,481,583 0 7.58071 -0.93159 0 nC 5-1,524,891 0 7.33129 -0.89143 0 nC 6-1,778,901 0 6.96783 -0.84634 0 nC 7-2,018,803 0 6.52914 -0.79543 0 nC 8 0 -7,646.81641 12.48457 -0.73152 0 You will find it useful to use a program such as MATLAB or MathCAD to determine the bubble-point temperature of the feed, bottoms, and distillate streams (see Eqn 4-12 in S&H). This will allow the calculation of volatility of each stream for various components to help you use the Fenske and Underwood equations....
View Full Document

{[ snackBarMessage ]}

### Page1 / 2

HW12 ChE 150B F2009 - and the location of the feed plate...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online