Effect of Tween 80 on Bubble Size and Mass Transfer in a Bubble Contactor

Abstract

Gas absorption in aqueous solutions with Tween 80 and absorption processes based on hydrodynamics and mass transfer is determined. The impact of surfactant concentration on gas holdup and gas-liquid interfacial area is analyzed, observing an increase of these parameters with surfactant concentration. The influence of liquid-phase contamination on the absorption process is investigated on the basis of the liquid-film mass transfer coefficient, removing the effect caused by the presence of a surfactant and the gas flow rate on the interfacial area and, thereby, on the volumetric mass transfer coefficient. The opposite effect on the mass transfer coefficient can be observed which decreases in the presence of the surfactant.

Oxygen Mass Transfer Rate in a Pressurized Lab‐Scale Stirred Bioreactor

“…At higher gas flow rates, the gas holdup in the bioreactor increases, leading to a higher surface area of bubbles which in turn increases the k L a values. The change in gas flow rate affects the fractional gas holdup, and hence, the a and consequently k L a values [18]. Thus, according to Eq.…”

Experimental investigation of the effect of ethyl alcohol surfactant on oxygen mass transfer and bubble size distribution in an air-water multiphase Taylor-Couette vortex bioreactor

“…Interfacial surface tension between gas bubbles and the continuous liquid phase affects mass transfer, bubble size [42,43] and coalescence and breakup of bubbles [44,45]. Generally, the addition of surfactant reduces the size of bubbles, resulting in increased specific interfacial surface area, a [9,46,47] and gas holdup [48] while simultaneously decreasing the liquid side mass transfer coefficient, k L [49,50]. Hence, the overall effect of addition of surfactants on the gas-liquid mass transfer rate depends upon whether k L or a is more sensitive to these additives.…”

“…In general, surfactants have a much larger impact on interfacial surface area, and therefore the value of k L a increases with introduction of additives [13,51]. Examples of such surfactants in aqueous systems include alcohol [42,45], glycerol [52], the Tween family [11,49], sodium sulphite solution [53], ionic surfactants [15], and various sugars [54].…”

Experimental investigation of multiphase flow: Mass transfer and fluid flow in Taylor-Couette reactor and velocity field of train of particles in a square duct

“…Many factors such as presence of impurities, additives, or surfactants influence mass transfer in a gas-liquid system and the effect of surfactant has been widely studied (D. Diego Gomez-Diaz et al, 2009;Hebrard et al, 2009;Jamnongwong et al, 2010;Özbek and Gayik, 2001b;Sardeing et al, 2006). Interfacial surface tension between gas bubbles and the continuous liquid phase affects mass transfer (Belo et al, 2011;Chen et al, 2013;Sardeing et al, 2006), bubble size (Alves et al, 2002;Dumont et al, 2006;Gomez-Diaz et al, 2008;Jordan and Schumpe, 2001;Painmanakul et al, 2005) and coalescence and breakup of bubbles (Anastasiou et al, 2010;Chern et al, 2001;Sch et al, 2002;Walter and Blanch, 1986). It is reported that addition of surfactant generally increases the specific interfacial surface area, a, by reducing the size of bubbles (Chaumat et al, 2007;Garcia-Abuin et al, 2012Hebrard et al, 2009;Özbek and Gayik, 2001b), causes a higher gas holdup (Hur et al, 2014), and reduces the liquid side mass transfer coefficient, kL, (Belo et al, 2011;Mcclure et al, 2014).…”

“…It is generally expected that addition of a surfactant has a much larger impact on interfacial surface area, and therefore the value of kLa increases with introduction of additives (Asgharpour et al, 2010;Benedek and Heideger, 1971). Examples of such surfactants in aqueous systems include alcohol (Anastasiou et al, 2010;Dumont et al, 2006;Garcia-Abuin et al, 2010;Hur et al, 2014;Jordan and Schumpe, 2001;, glycerol (Özbek and Gayik, 2001b), the Tween family (Belo et al, 2011;Diego Gomez-Diaz et al, 2009), sodium sulphite solution (Linek et al, 2005a(Linek et al, , 2004, ionic surfactants (Moraveji et al, 2012), and various sugars (Chern et al, 2001;Dale D. Mcclure et al, 2015).…”