In Chemical Engineering Plug Flow Reactors That Is Those In

In chemical engineering, plug flow reactors (that is, those in witch fluid flows from one end to the other with minimal mixing along the longitudinal axis) are often used to convert reactants into products. It has been determined that the efficiency of the conversion can sometimes be improved by recycling a portion of the product stream so that it returns to the entrance for an additional pass through the reactor (Figure). The recycle rate is defined as

R = volume of fluid returned to entrance/volume leaving the system

Suppose that we are processing a chemical A to generate a product B. For the case where A forms B according to an autocatalytic reaction (that is, in which one of the products acts as a catalyst or stimulus for the reaction), it can be shown that an optimal recycle rate must satisfy

In chemical engineering, plug flow reactors (that is, those in

Where X Aƒ = the fraction of reactant A that is converted to product B. The optimal recycle rate corresponds to the minimum-sized reactor needed to attain the desired level of conversion. Use a

In chemical engineering, plug flow reactors (that is, those in

Numerical method to determine the recycle ratios needed to minimize reactor size for a fractional conversion of XAƒ = 0.95.

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