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CSTR Design for Reversible Reactions

By Ralph Levine |

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 plugflow reactors, agitation is easily available in CSTRs. In this article, batch and plugflow reactors are analyzed and compared to multiple CSTRs. Figure 1. Conversion in plug-flow reactors and CSTRs for second order reactions is shown here, with conversion per stage shown for the CSTR case 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 reversible second-order reactions. 2nd-order, reversible reactions The first case presented here is a kinetic process requiring a double component (2A) to be fed to a reactor, and producing two products (G and H). The design may be calculated for both CSTR and plug-flow…
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