Effect of superficial gas velocity on gas hold-up profiles in foaming liquids in bubble column reactors [An article from: Chemical Engineering Journal]

This digital document is a journal article from Chemical Engineering Journal, published by Elsevier in 2004. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

Description:
In an extension to our previous work [Chem. Eng. J. 84 (2001) 247], we continue our investigation in the present communication on the effect of superficial gas velocity on radial gas hold-up profiles for air-aqueous solutions of n-butanol. Radial variation of gas hold-up was investigated in 0.385m i.d. bubble column using gamma ray tomography. The gas phase was air and the liquid phase comprised of aqueous solution of n-butanol of three different concentrations, 0.02, 0.2 and 0.5% v/v. The range of superficial gas velocities studied is 0.06-0.24m/s. Two perforated sparger plates were used having the same free area (FA=0.42%) and two hole diameters (1mm, multipoint sparger; 25mm, single point sparger). The bubble size was found to reduce and the hold-up profiles were found to become flatter with an increase in butanol concentration and H"D/D ratio.