Influence of Liquid Properties and Operating Variables on Enrichment Ratio in Nonfoaming and Foaming Adsorptive Bubble Separation Techniques

Abstract

The influence of the liquid properties and the operating variables on the intrinsic volumetric flow rate, q 0 , of the droplets at the liquid−atmosphere interface in nonfoaming adsorptive bubble separation and that, W f0 , of the liquid in foam at the liquid−foam interface in foam separation was studied to estimate the enrichment ratio of surface−active substance in the both techniques. Each intrinsic flow rate was determined by the extrapolation method, which the authors proposed previously, and was mainly influenced by superficial gas velocity, liquid viscosity and surface tension. Despite of small change in the surface tension and the liquid viscosity, they greatly affected to the intrinsic flow rate for both the droplets and the liquid in foam. The experimental results were applied to a dimensional analysis. A good agreement of the experimental enrichment ratio and the calculated ones was obtained by using the correlations for nonfoaming and foaming.2

Variation of saturated surface density of ovalbumin on bubble surface in continuous foam separation

“…The experimental setup for foam separation is almost the same as that used in the previous study [6,21,24]. A schematic diagram of the experimental setup is shown in Fig.…”

“…The procedure for measuring the flow rate of the liquid in foam was the same as it described in the previous study [6,21,24]. The OA solution prepared at a desired concentration or pH was stored in a storage tank.…”

Adsorption behavior of bisphenol-A and diethyl phthalate onto bubble surface in nonfoaming adsorptive bubble separation

“…1. The setup is almost the same as that used in the previous study [28,29,32]. A bubble column consisting of a cylindrical acrylic resin tube of 4.4 cm I.D.…”

“…Taking into account that the objective surface-active substance contained in droplets is originated from the adsorbed at bubble-liquid interface and the dissolved in bulk liquid, the mass balance can be expressed as [28,29,32]:…”

Enrichment in axial direction of aqueous foam in continuous foam separation

“…Then, if variation in S f in foam height is small, that is, assuming that the surface area, S f0 , of bubbles at liquid-foam interface within the column is mostly equal to S f [22,23], the following relationship is also derived from Eq. (5):…”