The effect of electrolyte solutions on hydrodynamic and backmixing characteristics in bubble columnns

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Abstract

Gas holdup and axial heat dispersion coefficient measurements in the presence of an electrolyte solution are presented. The experiments were carried ou

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    Correlations are used to predict gas hold-up in bubble column reactors in the absence of experimental data. Several widely used correlations in the literature were tested to predict gas hold-up in bubble column with internals and air-water system refer to Table 2 for details on correlations (Akita and Yoshida, 1973; Hikita et al., 1980; Hikita and Kikukawa, 1974; Hughmark, 1967; Joshi et al., 1998; Kelkar et al., 1983; Reilly et al., 1986b). Figs. 7 and 8 compare the performance of these correlations against experimental data in the present study for 45 cm and 19 cm diameter column respectively.

  • The effect of electrolyte concentration on counter-current gas–liquid bubble column fluid dynamics: Gas holdup, flow regime transition and bubble size distributions

    2017, Chemical Engineering Research and Design
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    In the following, the main studies concerning the influence of electrolytes on the gas holdup are summarized. Kelkar et al. (1983) (dc = 0.154 m, HC = 3.25 m) reported an increase in the gas holdup and a negligible effect of the electrolyte concentration (NaCl, CaCl2 and Na2SO4) above ct. Zahradnik et al. (1997) (dc = 0.14, 0.15 and 0.29 m, Hc = 2.6 m) studied the influence of nine electrolytes and found that the gas holdup grew continuously for c ≤ ct, but little changes in the gas holdup were observed for c > ct.

  • Unified study of flow regimes and gas holdup in the presence of positive and negative surfactants in a non-uniformly aerated bubble column

    2011, Chemical Engineering Science
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    According to the results shown in Fig. 2, it is clear that equal concentration solutions C3, C6, C9, C12, C15 and C18 (all of them over the transition concentration value ((C/Ct)>1)) result in different εG values, being the solutions C3 (CaCl2), among those including electrolytes, and C18 (IBOH), among those including alcohols, the ones that seem to contain the most valuable coalescence-reducing agents, result that agrees with previous published data pointing out to the higher effectiveness of divalent cations (Ribeiro Jr. and Mewes, 2007; Snape et al., 1995; Zieminski and Whittemore, 1971) and high molecular weight alcohols (Jamialahmadi and Müller-Steinhagen, 1992) in reducing bubble coalescence. The results obtained agree with those reported by other authors (Anderson and Quinn, 1970; Camarasa et al., 1999; Chaumat et al., 2007; Dargar and Macchi, 2006; Jamialahmadi and Müller-Steinhagen, 1992; Jin et al., 2009; Kelkar et al., 1983; Mouza et al., 2005; Ribeiro Jr. and Mewes, 2007; Ruzicka et al., 2008; Snape et al., 1992, 1995; Tang and Heindel, 2004; Veera et al., 2001; Zahradnik et al., 1997; Zieminski and Whittemore, 1971) who, working with similar surfactants within the same range of concentrations, concluded that the presence of surfactants dissolved in the liquid phase increases εG being this effect more noticeable the higher the surfactant concentration. However, the magnitude of the effect shown in Fig. 2 is much smaller than that reported by the authors cited above, who concluded that even small amounts of impurities in water can lead to very significant enhancement in gas holdup in bubble columns (Anderson and Quinn, 1970; Dargar and Macchi, 2006; Mouza et al., 2005; Ribeiro Jr. and Mewes, 2007; Tang and Heindel, 2004; Veera et al., 2001; Zahradnik et al., 1997).

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