DYNAMIC SIMULATION AND CONTROL OF AN INDUSTRIAL SURFACTANT REACTOR

This case study investigates the behaviour of a semi-batch surfactant reactor and seeks ways to improve the reactor's operating efficiency t hrough the use of automatic control. The reaction involves adding ethy lene oxide (EO) to nonylphenol to form oligomer (short chain polymer) with the assistance of potassium hydroxide acting as catalyst. The rea ctor was modelled using dynamic mass and energy balances plus a descri ption of the kinetics of nonylphenol polyethoxylation. The pressure in reactor was calculated by applying Wilson's equation and the heat tra nsfer coefficient of the heat exchanger was determined from plant data . The model was implemented in SPEEDUP flowsheeting package; and able to predict the length of oligomers in the reactor at any time. The mod el has been tested and compared with the performance of the actual pla nt. Due to the nature of the semibatch reactor, it is difficult to man ually operate the reactor at a fixed optimal condition. Therefore, an improved automatic control scheme is needed to maintain the system as dose as possible to its optimum condition This was investigated by usi ng the model and was found to offer higher output from the reactor. (C ) 1998 Published by Elsevier Science Ltd. All rights reserved.