Investigating the Effects of Nanoparticle and Surfactant on Mass Transfer coefficient in Pulsed Packed Column

Document Type : Chemistry Article

Authors

1 Semnan University

2 Atomic Energy Organization

Abstract

In liquid-liquid extraction processes, the hydrodynamic characteristics of the system are important parameters in mass transfer. In this research, the effect of continuous and dispersed phases speed, and pulsation intensity on the hydrodynamic characteristics of the system has been investigated. The results showed that the pulsation intensity is an influential parameter. As the pulsation intensity increases, the droplet diameter decreases and the hold-up in the system increases. Then, the effect of nanoparticle and surfactant on the hydrodynamic characteristics of the system was investigated. The results showed that by adding nanoparticle and surfactant, the droplet size decreased and the hold-up increased. A semi-empirical correlation is proposed to predict droplet diameter in terms of operating parameters and system properties and nanoparticle concentration. The results showed that with increasing nanoparticle concentration, the droplet diameter decreases and the predominant mechanism of mass transfer is molecular diffusion. In this case, by using nanoparticles, the extraction efficiency increases from 46 to 78%. By adding a surfactant to the system, the extraction efficiency increases from 70 to 91%. The mechanism of mass transfer in the system without the presence of nanoparticle and surfactant was investigated in their presence. The results show that in this system with the presence of nanoparticle and surfactant Newman theory is a suitable model for predicting mass transfer coefficient.

Keywords


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