Semibatch reaction crystallization of benzoic acid

Mesomixing in semi‐batch reaction crystallization and influence of reactor size

“…Increased agitation and reduced feeding rate lead to increased product weight mean size, which is in agreement with our previous results in the loop reactor (Torbacke and Rasmuson, 2001), and in a smaller agitated tank (Åslund and Rasmuson, 1992). There is a significant influence of the feed pipe diameter, and this was also found in the loop reactor experiments.…”

“…The product crystal mean size increases with increasing feeding time, but this increase levels off at long total feeding times. The same was found in our previous studies (Åslund and Rasmuson, 1992;Torbacke and Rasmuson, 2001), and this is a characteristic of a process influenced by mesomixing (Baldyga et al, 1997). For long feeding times, the weight mean size is expected to depend on micromixing only.…”

“…Åslund and Rasmuson (1992) obtained CV-values of about 0.3 for the same system in the 1 L experiments.…”

“…There is a significant influence of the feed pipe diameter, and this was also found in the loop reactor experiments. In the loop reactor, the volume is approximately 2.5 L. Åslund and Rasmuson (1992) used an active volume of about 1 L. Both studies will be included in the analysis of the influence of crystallizer size, and for this reason data for estimation of the time constants for the conditions of these experiments are also given together with the data needed for the experiments of this study.…”

Mixing, reaction, and precipitation: Interaction by exchange with mean micromixing models

“…Villermaux (1990) presented an approach of mathematical modeling of the design of industrial precipitators and to account for the mixing influence on product quality. Most recent studies appear to deal with batch or semibatch reactive precipitation processes (Kuboi et al, 1986;Tosun, 1988;Baldyga et al, 1990;Tovistiga and Wirges, 1990;Marcant and David, 1991Aslund and Rasmuson, 1992;Baldyga, 1993;Podgorska et al, 1993;Iyer and Przybycien, 1994) rather than with continuous operation (Fitchett and Tarbell, 1990;Mydlarz et al, 1992;Tavare, 1993).…”