The flow rate through the tank is Q and the concentration ofheptene is C 0. Consider a stream of butene in cyclohexane that is converted to buteneepoxide by reaction with a peroxide in a CSTR. 301-306, this is called the"perfect mixer". In the simplest approximation that a uniform extent ofmixing occurs in the stirred tank, Middleman p. Fluid motion in astirred tank is confined to the immediate region of the mixer blades for highviscosity fluids. Dead zones in a stirred tank for high viscosity fluidsshould be very familiar to anyone who has worked in a kitchen mixing dough witha hand mixer. For mixing one cansometimes assume a constant rate of strain in the stirred tank, Middleman p.340-348, and the residence time distribution can then be used under thisapproximation, as a measure of the extent of mixing. The residencetime distribution becomes a measure of the extent of a chemical reaction inthis situation. Often stirred tanksare used as industrial reactors where a chemical component of a flow streamresides for some time in the tank and then proceeds on to other steps in achemical process. 340-348) although the use of dimensionlessnumbers and comparison with literature accounts can lead to some predictivecapabilities. Mixing in a stirred tank is complicatedand not well described (Middleman p. 301-306 and340-348)Ī stirred tank is the most fundamental of mixers and manycommon mixers from the Brabender mixer used in lab to a cup of coffee with aspoon can be considered a stirred tank under some set of approximation. Continuous Stirred Tank Reactor (CSTR): (Follows Middleman p.
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