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Comment Processing & Handling

CSTRs: Bound for Maximum Conversion

By Ralph Levine Retired |

Here, a design approach for continuous stirred-tank reactors is outlined for both reversible and irreversible second-order reactions Multiple CSTRs (continuous stirred-tank reactors) are advantageous in situations where the reaction is slow; two immiscible liquids are present and require higher agitation rates; or viscous liquids are present that require high agitation rates. Unlike in plug-flow reactors, agitation is easily available in CSTRs. In this article, analyses of batch and plug-flow reactors are calculated and compared to multiple CSTRs. The number of reactors required in a CSTR system is based on the conversion for each stage. When the final stage obtains the fraction of unconverted reactant that is equal to the desired final value from the plug-flow case, the CSTR system is complete. The volumetric efficiency of multiple CSTRs is expressed as a function of conversion per stage and gives the total conversion required. In this article, we will apply this to both irreversible and reversible second-order reactions. 2nd-order, irreversible reaction For a two-component system reacting irreversibly, design of a CSTR series requires knowledge of the following: the volumetric efficiency of the reactor based on the order of the…
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