Studies on Gas Hold-Up , Mass Transfer Coefficient,Mixing Time And Circulation Time In Bubble ColumnsWith Draught Tube For Pseudo Plastic (Carboxymethyl) Cellulose And Glycerol Solutions

Abdul.R.N.Jasim, Ali

doi:10.30684/etj.27.12.1

	Studies on Gas Hold-Up , Mass Transfer Coefficient,Mixing Time And Circulation Time In Bubble ColumnsWith Draught Tube For Pseudo Plastic (Carboxymethyl) Cellulose And Glycerol Solutions
Engineering and Technology Journal
Article 1, Volume 27, Issue 12, 2009, Pages 2245-2256 PDF (266.89 K)
DOI: 10.30684/etj.27.12.1
Author
Ali Abdul.R.N.Jasim
Abstract
Bubble column reactors are widely used in chemical process industries for carrying out gas-liquid and gas-liquid-solid reactions such as absorption, biochemical process and coal liquefaction. To design such a column, four main parameters should by 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 gas velocity and liquid phase properties [Newtonian and non-Newtonian] on g e , KLa, tm and tc in bubble column with draught tube when the ratio of the draught tube diameter to column diameter equal to 0.5 and the gas dispersed into the base of the draught tube by 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 experimental observations g e , and KLa increased with increasing gas velocity and coalescence inhibition of liquid, while tm and tc decrease with increasing gas velocity. It was found that increasing liquid viscosity and coalescence reduces g e and KLa but increases tm and tc.

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