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Reactors with predominant overall circulation

The flow patterns in stirred tank reactors are complicated and are mostly difficult to model in a way that is practically applicable. Consequently, the quantitative effects of the rate of macro-mixing are difficult to estimate. There is one exception the situation where the reactor contents can be considered to be completely segregated (very slow micro-mixing). This situation, that has limited practical importance, was discussed in section 7.2.1.2. [Pg.210]

In many practical situations, the flow pattern in stirred reactors is turbulent. Then micro-mixing is always faster than macro-mixing, and the concept of complete segregation cannot apply. A qualitative estimate of the influence of imperfect mado-mixing can be based on the ratio between the reaction time and the macro-mixing time. [Pg.210]

In general, the reaction time is related to the relative rate of conversion of reactant (A) that is not in excess. It was defined in eq. (5.1) as follows [Pg.210]

In a stirred reactor, the macro-mixing time in turbulent flow is approximately equal to circulation time, see eq. (4.6)  [Pg.210]

Imperfect macro-mixing in stirred tank reactors with turbulent flow can have three different effects  [Pg.211]


See other pages where Reactors with predominant overall circulation is mentioned: [Pg.210]    [Pg.210]    [Pg.511]   


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