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Chemical Engineering and Processing 45 (2006) 140149 Impact of disturbance magnitudes and directions on the
 

Summary: Chemical Engineering and Processing 45 (2006) 140149
Impact of disturbance magnitudes and directions on the
dynamic behavior of a generic reactive distillation
Moshood J. Olanrewaju, Muhammad A. Al-Arfaj
Department of Chemical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
Received 7 February 2005; received in revised form 23 June 2005; accepted 23 July 2005
Available online 15 September 2005
Abstract
The dynamic behavior for a high-purity/high-conversion reactive distillation is investigated. The impact of disturbance magnitudes and
directions on both open loop and closed loop stability of the system is studied. Excess of less volatile reactant in two-reactant-two-product
generic reactive distillation is found to enhance open loop stability, but decreases the products purity. However, excess of more volatile reactant
trigger the system to another steady-state. Open loop changes in the manipulated variables (i.e. vapor boilup from the reboiler and reflux rate
from the condenser) in certain directions are found to be intolerable due to their effect on both the reaction kinetics and the fractionation
capacity of the column. The performance of the open loop system is improved significantly with the inclusion of internal inventory control of
one of the reactants but this has been found to be insufficient when there is a change in some inputs in certain directions. Steady-state rating
analysis on the system suggests that the limitations on certain inputs could be resolved by including a single-end controller, which will act to
maintain the separation capacity of the column and thus stabilizes the system.
2005 Elsevier B.V. All rights reserved.
Keywords: Reactive distillation; Dynamic simulation; Nonlinear dynamics
1. Introduction

  

Source: Al-Arfaj, Muhammad A. - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals

 

Collections: Engineering