Effects of the presence and absence of nanoparticles in the hold-up and hydrodynamic velocities in the pulsed disc and doughnut column by using central composite design method

Abstract

The pulsed disc and doughnut column (PDDC) presents a valuable and profoundly satisfying solution for recovering and purifying components from mixtures when a separation challenge involves purifying a liquid or recovering components from mixtures. Furthermore, because of their improved mass transfer and efficiency, the application of nanofluids within liquid-liquid extraction systems has lately received with increased interest. In the behavior of silica nanoparticles (0, 0.025, and 0.05 wt percent), the hydrodynamic velocities and dispersed phase hold-up between the aqueous and organic phases were measured. The central composite design (CCD) was adopted to assess the impacts of three running parameters on slip velocity (Vs) and dispersed phase hold-up (φ) at five levels. The findings revealed that higher intensity and higher aqueous phase velocity led to the decrement of slip velocity, and increment of hold-up. The higher number of droplets into column leads to the larger values for Vs, and φ. The correlation coefficients (R2) equals to 0.9627, and 0.9838 were obtained for hold-up and slip velocity with the predicted quadratic model with the presence of 0.025% nanoparticles. The presence of nanoparticles increased the dispersed phase hold-up and a decrease in slip velocity, which was connected to a reduction of interfacial tension with nanofluids, Brownian motion of nanoparticles, and a negative impact on droplet stability due to increased internal mixing inside droplets. A CCD proposes new and simple experimental relationships as the slip velocity and dispersed phase hold-up.