Izdihar Abdul-Ahad Mani
Published: 1994
Total Pages: 226
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Experimental results obtained on a small scale electrostatic liquid-liquid extraction column showed that electrostatic coalescence can effectively counterbalance the droplet dispersion caused by high shear mixing, thus enhancing the coalescence-redispersion cycle which increases the rate of surface renewal and also the rate of mass transfer. A fuller understanding of the inter-relationships between throughput, impeller speed, electric field strength was accomplished. The effect of rotor speed, voltage, total throughput and superficial phase flowrates upon hold-up were determined quantitatively Slip velocity was correlated as: Vs = Vk (l-h)m where (m) is a function of rotor speed and voltage. Three reg ons of column operation with regard to slip velocity were recognised, subcritical, critical and supercritical. Column mass transfer performance was determined in terms of the effects of rotor speed, voltage and total throughput. A new approach in expressing column performance based upon the coalescence-redispersion cycle presentation, mass transfer and overall available surface area, was achieved. Optimum column operation condition was found to be at: 2 kV, 2000 min-1, L min-1.