Abstract
In this study, we investigate the effect of temperature reaction and hydrogen amount as the most effective process variables on Ziegler–Natta catalysts; with the aim of evaluating their effects on how to grow molecular weight and its dispersity during polypropylene polymerization with the aid of a validated mathematical model. The used approach in modeling is polymer moment balance technique (population balance approach) in MATLAB/SIMULINK environment, and then the model has been validated by experimental data come from a laboratory scale reactor. The main target of this study is to gain considerable insight into Ziegler–Natta catalyst performance against changing of the variables. The model might be applicable for the catalyst makers to evaluate and to improve their catalysts and also could be useful for process chemical engineers to easily operate the plant, to replace a new catalyst, to optimize process conditions and to generate new formulation for a new grade.
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REFERENCES
Mülhaupt, R., Catalytic polymerization and post polymerization catalysis fifty years after the discovery of Ziegler’s catalysts, Macromol. Chem. Phys., 2003, vol. 204, no. 2, pp. 289–327.
Busico, V., Cipullo, R., Mingione, A., and Rongo, L., Accelerating the research approach to Ziegler–Natta catalysts, Ind. Eng. Chem. Res., 2016, vol. 55, no. 10, pp. 2686–2695.
Reginato, A.S., Zacca, J.J., and Secchi, A.R., Modeling and simulation of propylene polymerization in nonideal loop reactors, AIChE J., 2003, vol. 49, no. 10, pp. 2642–2654.
Varshouee, G.H., Heydarinasab, A., Shaheen, U., Aborehab, M.A.S., Vaziri, A., El Ouadi, Y., Roozbahani, B., Bouyanzer, A., Hammouti, B., and Hadda, T.B., Hydrogen effect modeling on Ziegler–Natta catalyst and final product properties in propylene polymerization, Bull. Chem. Soc. Ethiop., 2018, vol. 32, no. 2, pp. 371–386.
Varshouee, G.H., Heydarinasab, A, Vaziri, A, and Roozbahani, B., Determining final product properties and kinetics studies of polypropylene polymerization by a validated mathematical model, Bull. Chem. Soc. Ethiop., 2018, vol. 32, no. 3, pp. 579–594.
Pater, J.T., Weickert, G., and van Swaaij, W.P., Polymerization of liquid propylene with a 4th generation Ziegler–Natta catalyst—Influence of temperature, hydrogen and monomer concentration and prepolymerization method on polymerization kinetics, Chem. Eng. Sci., 2002, vol. 57, no.16, pp. 3461–3477.
Shimizu, F., Pater, J., van Swaaij, W.P., and Weickert, G., Kinetic study of a highly active MgCl2-supported Ziegler–Natta catalyst in liquid pool propylene polymerization. II. The influence of alkyl aluminum and alkoxysilane on catalyst activation and deactivation, J. App. Polym. Sci., 2002, vol. 83, no. 12, pp. 2669–2679.
Ali, M., Betlem, B., Roffel, B., and Weickert, G., Hydrogen response in liquid propylene polymerization: Towards a generalized model, AIChE J., 2006, vol. 52, no. 5, pp. 1866–1876.
Guastalla, G. and Giannini, U., The influence of hydrogen on the polymerization of propylene and ethylene with an MgCl2 supported catalyst, Macromol. Rapid Commun., 1983, vol. 4, no. 8, pp. 519–527.
Spitz, R., Masson, P., Bobichon, C., and Guyot, A., Activation of propene polymerization by hydrogen for improved MgCl2-supported Ziegler–Natta catalysts, Macromol. Chem. Phys., 1989, vol. 190, no. 4, pp. 717–723.
Rishina, L.A., Vizen, E.I., Sosnovskaja, L.N., and Dyachkovsky, F.S., Study of the effect of hydrogen in propylene polymerization with the MgCl2-supported Ziegler–Natta catalyst—Part 1. Kinetics of polymerization, Eur. Polym. J., 1994, vol. 30, no. 11, pp.1309–1313.
Soga, K. and Siono, T., Effect of hydrogen on the molecular weight of polypropylene with Ziegler–Natta catalysts, Polym. Bull. (Heidelberg, Ger.), 1982, vol. 8, no. 5, pp. 261–268. https://doi.org/10.1007/BF00700287
Kahraman, R., Erdoǧan, M., and Bilgic, T., Polymerization of propylene using a prepolymerized high-active Ziegler–Natta catalyst. I. Kinetic studies, J. App. Polym. Sci., 1996, vol. 60, no. 3, pp. 333–342.
Luo, Z.H., Zheng, Y., Cao, Z.K., and Wen, S.H., Mathematical modeling of the molecular weight distribution of polypropylene produced in a loop reactor, Polym. Eng. Sci., 2007, vol. 47, no. 10, pp. 1643–1649.
Costa, G.M.N., Kislansky, S., Oliveira, L.C., Pessoa, F.L.P., Vieira de Melo, S.A.B., and Embiruçu, M., Modeling of solid–liquid equilibria for polyethylene and polypropylene solutions with equations of state, J. App. Polym. Sci., 2011, vol. 121, no. 3, pp. 1832–1849.
Varshouee, G.H., Heydarinasab, A., Vaziri, A., and Zarand, S.M.G., Determining the best reaction temperature and hydrogen amount for propylene polymerization by a mathematical model, Kem. Ind., 2019, vol. 68, pp. 119–127. https://doi.org/10.15255/KUI.2018.038
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Varshouee, G., Heydarinasab, A., Vaziri, A. et al. Investigating Growth of Molecular Weight and Its Dispersity of Polypropylene during Polymerization by a Validated Mathematical Model. Theor Found Chem Eng 54, 983–994 (2020). https://doi.org/10.1134/S0040579520050450
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DOI: https://doi.org/10.1134/S0040579520050450