1Chemical and Petroleum Engineering Department, Sharif University of Technology, P.O. Box: 11365-9465 Tehran, I.R. IRAN
2Iran Polymer and Petrochemical Institute, P.O. Box: 14965-115 Tehran, I.R. IRAN
In this paper, optimization and control of a tubular reactor for thermal bulk post-polymerization of styrene have been investigated. By using the reactor mathematical model, static and dynamic simulations are carried out. Based on an objective function including polymer conversion and polydispersity, reactor optimal temperature profile has been obtained. In the absence of model mismatch, desired product characteristic can also be obtained by applying the corresponding reactor wall or jacket temperature profile. To achieve this temperature trajectory, reactor jacket is divided into three zones and jacket inlet temperatures are used as manipulated variables. Effectiveness of the proposed approach has been demonstrated through computer simulation. Furthermore for a special case of model mismatch, a method has been proposed which results in a near optimal profile.
 Zhang M., Ray W.H., “Odeling of Living Free-Radical Polymerization Processes. II. Tubular Reactors, Journal of Applied Polymer Science, 86, p. 1047 (2002).
 Beuermann S., Buback M., Gadermann M., Jurgens M., Saggu D.P., Tubular Reactor Synthesis of Styrene-Methacrylate Copolymers in Solution with Supercritical Carbon Dioxide, J. of Supercritical Fluids, 39 , p. 246 (2006).
 Agarwal S.S., Kleinstreuer C., Analysis of Styrene Polymerization in a Continuous Flow Tubular Reactor, Chemical Engineering Science, 41, p. 3101 (1986).
 Chen C.C., A Continuous Bulk Polymerization Process for Crystal Polystyrene, Polymer-Plastic Technology of Engineering, 33, p. 55 (1994).
 Chen C.C., Nauman E.B., Verification of a Complex, Variable Viscosity Model for a Tubular Polymerization Reactor, Chemical Engineering Science, 44, p. 179 (1989).
 Costa E.F., Lage P.L.C., Biscaia E.C., On the Numerical Solution and Optimization of Styrene Polymerization in Tubular Reactors, Computers & Chemical Engineering, 27, p. 1591 (2003).
 Vega M.P., Lima E.L., Pinto J.C., Use of Bifurcation Analysis for Development of Nonlinear Models for Control Applications, Chemical Engineering Science, 63, p. 5129 (2008).
 Wallis J.P., Ritter R.A., Andre H., Continuous Production of Polystyrene in a Tubular Reactor: Part II, AIChE Journal, 21, p. 691 (1975).
 Process Economic Program, SRI International, 39D, "Polystyrene", (2001).
 Gharaghani M., Abedini H., Parvazinia M., Dynamic Simulation and Control of Auto-Refrigerated CSTR and Tubular Reactor for Bulk Styrene Polymerization, Chem. Eng. Res. Des., doi:10.1016/j.cherd.2012.01.019 (2012).
 Hui A.W., Hamielec A.E., Thermal Polymerization of Styrene at High Conversions and Temperatures-An Experimental Study, J. Appl. Polym. Sci., 16, p. 749 (1972).
 Shahrokhi M., Nejati A., Optimal Temperature Control of Thermal Cracking Reactor, Ind. Eng. Chem. Res., 41, p. 6572 (2002).
 Rice R., Do D.D., "Applied Mathematics and Modeling for Chemical Engineers", New York Wiley, (1994).