Gas Hold-Up and Volumetric Liquid-Phase Mass Transfer Coefficient In Solid-Suspended Bubble Columns With Draught Tube


The solid suspended-bubble columns with draught tube are widely used as a threephaseslurry reactor in industrial chemical process such as absorption, biochemicalreactions, coal liquefaction. etc. To design such a column the average gas holdup ( g e )and the volumetric liquid-phase mass transfer coefficient (KLa) should be known. Thisstudy includes the effect of gas velocity, liquid-phase properties, solid-particlesconcentration and the static liquid height on both ( g e ) and (KLa). It was found thatboth ( g e ) and (KLa) increase with increasing gas velocity and decrease with increasingsolid particles concentration, static liquid height, viscosity and surface tension ofliquid-phase.