Mixing state of xanthan gum solution in an aerated and agitated fermentor—Effects of impeller size on volumes of mixing regions and circulation time distribution

Agitator speed and dissolved oxygen effects in Xanthan fermentations

“…Ever since Xanthan gum was first reported by Rogovin et al (1961), considerable research has been devoted to address the problems of poor bulk mixing and low oxygen transfer rates in Xanthan gum fermentations (Flores et al, 1994;Funahashi et al, 1987bFunahashi et al, , 1988aFunahashi et al, , 1988bNienow, 1992, 1993;Herbst et al, 1992;Nienow, 1984;Nienow and Elson, 1988;Moraine and Rogovin, 1973;Peters et al, 1989aPeters et al, , 1989bPeters et al, , 1992Zhao et al, 1994). It is generally agreed upon in the literature that the process bottleneck in highly productive Xanthan fermentations is related to these two parameters.…”