Safety control of ethoxylation reaction in a semi-batch reactor

Authors

DOI:

https://doi.org/10.33448/rsd-v11i2.25692

Keywords:

Ethoxylation; Ethylene oxide; Nonylphenol; Non-ionic surfactants; Aspen Plus Dynamics®.

Abstract

Non-ionic surfactants are important chemical products, they are raw materials in the production of solvents, detergents, paints etc. They are produced through the ethoxylation reaction, that takes place in semi-batch reactors, by reacting between ethylene oxide with an organic substrate in the presence of a basic catalyst such as KOH. Due to the instability and reactivity of ethylene oxide, ethoxylation is a highly exothermic reaction, which requires the presence of a heat exchange system, with strict control of temperature and pressure that prevents explosions. In this paper, the ethoxylation of nonylphenol to obtain nonylphenol 9 EO (nonoxynol 9) was simulated in Aspen Plus Dynamics® where temperature, pressure, and batch flow controls were implemented and evaluated. The results obtained showed that the control from the response of ∆P (difference between the operating limit pressure and the real reactor pressure) is effective, consequently, the reactor pressure remains controlled and lower than the limiting pressures of the system throughout the reaction process.

References

Chemspider (2022). Nonoxynol-9. https://www.chemspider.com/Chemical-Structure.65319.html?rid=f4d33815-fcac-4049-b7f6-a5c3cbe30c22

Chiu, Y. N. (2005). Ethoxylation reactor modelling and design (Doctoral dissertation, Swinburne University of Technology, Faculty of Engineering and Industrial Sciences, Centre for Micro-Photonics).

Chiu, Y. N., Naser, J., Ngian, K. F., & Pratt, K. C. (2008). Numerical simulations of the reactive mixing in a commercially operated stirred ethoxylation reactor. Chemical engineering science, 63(11), 3008-3023.

Chiu, Y. N., Naser, J., Ngian, K. F., & Pratt, K. C. (2009). Computation of the flow and reactive mixing in dual-Rushton ethoxylation reactor. Chemical Engineering and Processing: Process Intensification, 48(5), 977-987.

Chiu, Y. N., Naser, J., Easton, A., Ngian, K. F., & Pratt, K. C. (2010). Kinetics of a catalyzed semi-batch ethoxylation of nonylphenol. Chemical engineering science, 65(3), 1167-1172.

Di Serio, M., Tesser, R., Felippone, F., & Santacesaria, E. (1995). Ethylene oxide solubility and ethoxylation kinetics in the synthesis of nonionic surfactants. Industrial & engineering chemistry research, 34(11), 4092-4098.

Di Serio, M., Tesser, R., & Santacesaria, E. (2005). Comparison of different reactor types used in the manufacture of ethoxylated, propoxylated products. Industrial & engineering chemistry research, 44(25), 9482-9489.

Gustin, J. L. (2001). Safety of ethoxylation reactions. LOSS PREVENTION BULLETIN-INSTITUTION OF CHEMICAL ENGINEERS, 157, 11-18.

Khuu, S. M., Romagnoli, J. A., Bahri, P. A., & Weiss, G. (1998). Dynamic simulation and control of an industrial surfactant reactor. Computers & chemical engineering, 22, S715-S718.

Khuu, S. M., Rodriguez, J. A., Romagnoli, J. A., & Ngian, K. F. (2000). Optimisation and control of an industrial surfactant reactor. Computers & Chemical Engineering, 24(2-7), 863-870..

Salzano, E., Di Serio, M., & Santacesaria, E. (2007). The role of recirculation loop on the risk of ethoxylation processes. Journal of loss prevention in the process industries, 20(3), 238-250.

Santacesaria, E., Di Serio, M., Lisi, L., & Gelosa, D. (1990). Kinetics of nonylphenol polyethoxylation catalyzed by potassium hydroxide. Industrial & engineering chemistry research, 29(5), 719-725.

Santacesaria, E., Diserio, M., & Tesser, R. (1995). Role of ethylene oxide solubility in the ethoxylation processes. Catalysis today, 24(1-2), 23-28..

Santacesaria, E., Di Serio, M., & Iengo, P. (1999). Kinetics and reactor simulation for polyethoxylation and polypropoxylation reactions. In Studies in Surface Science and Catalysis (Vol. 122, pp. 267-274). Elsevier.

Santacesaria, E., Tesser, R., & Di Serio, M. (2018). Polyethoxylation and polypropoxylation reactions: Kinetics, mass transfer and industrial reactor design. Chinese journal of chemical engineering, 26(6), 1235-1251.

Schick, M. J. (1987). Nonionic surfactants. Surfactant Science Series, 23.

Patel, N. C., & Young, M. A. (1993). Measurement and prediction of vapor-liquid equilibria for a reactive system: application to ethylene oxide+ nonyl phenol. Fluid phase equilibria, 82, 79-92.

Pekalski, A. A., Zevenbergen, J. F., Braithwaite, M., Lemkowitz, S. M., & Pasman, H. J. (2005). Explosive decomposition of ethylene oxide at elevated condition: effect of ignition energy, nitrogen dilution, and turbulence. Journal of hazardous materials, 118(1-3), 19-34.

Pubchem (2022). Nonoxynol-9. https://pubchem.ncbi.nlm.nih.gov/compound/Nonoxynol-9

Zhang, R., Wu, S., Lu, R., & Gao, F. (2014). Predictive control optimization based PID control for temperature in an industrial surfactant reactor. Chemometrics and Intelligent Laboratory Systems, 135, 48-62.

Published

25/01/2022

How to Cite

SOUZA, H. do N. .; BRITO, K. D. .; MISAEL, C. G. A. .; GONÇALVES, R. C. de F. .; BRITO, R. P. . Safety control of ethoxylation reaction in a semi-batch reactor. Research, Society and Development, [S. l.], v. 11, n. 2, p. e27511225692, 2022. DOI: 10.33448/rsd-v11i2.25692. Disponível em: https://www.rsdjournal.org/index.php/rsd/article/view/25692. Acesso em: 20 feb. 2024.

Issue

Section

Engineerings