Answered: Coolant C AT Feed R D Steam S N AT XB В…

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

Problem 1.1P

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Question

A conventional multiloop control scheme consisting of two PI controllers is to be used to control the product compo-sition sxD and xB of the distillation column shown in Fig.The manipulated variables are the reflux flow rate R and thesteam flow rate to the reboiler S. Experimental data for a num-ber of steady-state conditions are summarized below. Use thisinformation to do the following:(a)Calculate the RGA and determine the recommended pair-ing between controlled and manipulated variables.(b)Does this pairing seem appropriate from dynamic consid-erations? Justify your answer

R
S
Run
(Ib/min)
(lb/min)
Xp
XB
1
125
22
0.97
0.04
150
22
0.95
0.05
3
175
22
0.93
0.06
4
150
20
0.94
0.06
5
150
24
0.96
0.04

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