(180t) Understanding of Liquid-Liquid Mass Transfer at High pH and Salt Concentrations

This study addressed liquid-liquid mass transfer at highly acidic conditions. The effect of coexisting salt was also investigated. Using a borescope and CCD camera system, the Sauter mean diameter of chlorobenzene droplet was measured. At high pH, the Sauter mean diameter greatly decreased due to the change of density difference between two phases, and it further decreased when salt was added. A Sauter mean diameter correlation was newly proposed using a density difference term, and it could predict the experimental results accurately. The mass transfer coefficient was also determined by measuring the solubility and the concentration gradient of chlorobenzene. As the pH and the salt concentration increased, the solubility and the rate of change of the chlorobenzene concentration both decreased. However, the decrease in solubility was more dominant. Thus, the mass transfer coefficient increased with the pH and salt concentration.