Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4990234 | Separation and Purification Technology | 2017 | 13 Pages |
Abstract
Hydrophobic titania nanoparticles were synthesized by a novel in situ sol-gel method and applied in a single drop liquid-liquid extraction column to enhance the overall dispersed-phase mass transfer coefficient (Kod). The chemical system of toluene, acetic acid and water was used, and the direction of solute (acetic acid) mass transfer was from dispersed phase, including: toluene and acetic acid to the continuous phase of water. For such system, much of the mass transfer resistance exists in the dispersed phase, which is nonpolar organic liquid. Hence, modified titania nanoparticles (MTNP's), prepared by sol-gel route, in five different concentrations of 0.001-0.005Â wt.% were added in the dispersed phase. Also, the impact of MTNP's at the different solute concentrations and nozzles was investigated. Results indicated an anomalous enhancement in the overall dispersed-phase mass transfer coefficient at 0.002Â wt.% of MTNP's. A maximum enhancement of 70% in the overall mass transfer coefficient was found in droplets formed from a nozzle of 2.5Â mm inner diameter, containing 3Â wt.% of solute. Eventually, based on the theoretical model of Newman, a semi-empirical model was presented, that is capable to predict the overall dispersed-phase mass transfer coefficient of nanofluids with an average absolute relative error of 8.6%.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Filtration and Separation
Authors
Ashkan Hatami, Dariush Bastani, Farhood Najafi,