Ali Abdul.R.N.Jasim
Abstract
Bubble column reactors are widely used in chemical process industries forcarrying out gas-liquid and gas-liquid-solid reactions such as absorption, biochemicalprocess and coal liquefaction. ...
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Bubble column reactors are widely used in chemical process industries forcarrying out gas-liquid and gas-liquid-solid reactions such as absorption, biochemicalprocess and coal liquefaction. To design such a column, four main parameters shouldby taken in consideration, the gas hold-up ( g e ), liquid phase mass transfer coefficient(KLa), mixing time (tm) and circulation time (tc). The study includes the effect of gasvelocity and liquid phase properties [Newtonian and non-Newtonian] on g e , KLa, tmand tc in bubble column with draught tube when the ratio of the draught tube diameterto column diameter equal to 0.5 and the gas dispersed into the base of the draught tubeby using [amultihole, 0.15mm equivalent diameter and 0.61% free sectional area]distributor.Water and aqueous solutions of glycerol and CMC [Carboxymethyl Cellulose],were used as the liquid phase [Newtonian and non-Newtonian]. From experimentalobservations g e , and KLa increased with increasing gas velocity and coalescenceinhibition of liquid, while tm and tc decrease with increasing gas velocity.It was found that increasing liquid viscosity and coalescence reduces g e and KLabut increases tm and tc.
