Experimental
set upThe first step of the work was to build an internal circularbundle of 6diameter arranged concentrically within the 18diameter column. The 18diameter column, shown in Fig. 2and made of two Plexiglas sections of 74height each, wasused. The internal circular bundle is composed of 19 PVC rodsof 1diameter each and has an inner diameter of 6(Fig. 3). Thestructure was fixed by means of a top plate as shown in Fig. 4(b)and three spacers as shown in Fig. 4(a). This tube bundle wasallowed to hang 5above the gas distributor. An air–watersystem was used with the gas continuously fed through a per-forated plate at the bottom of the column into a batch bed ofliquid