INFLUENCING THE RATE OF MASS TRANSFER IN REACTIVE EXTRACTION USING HIGH VOLTAGE

摘要

Mass transfer of p-toluenesulfonic acid, PTA, dissolved in water extracted with tri-n-octylamine, TOA, dissolved in toluene was investigated in a planar mass transfer cell with a constant interfacial area when high electrostatic fields (DC) were applied. Mass transfer was found to be markedly accelerated, and this can be explained by the field induced potential gradient which is the driving force. An electrostatically extended kinetic model based on the Nernst-Planck equation was developed to quantify the enhancement of mass transfer. The theory was also proved with a cation exchange system as is zinc chloride/di-2-ethylhexylphosphoric acid ester (D2EHPA) in toluene.