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The two fluids to be reacted mix and flow through a pipe that is stuffed full of catalyst. The length of the pipe depends on the desired conversion of product. A recycle stream can be added to mix with the incoming feed if desired. Also one or more of the reactants can be added at different points in the reactor if desirable. If the reaction is exothermic a cooling mechanism will be needed to reduce thermal stress on the reactor walls and/or keep the reactor operating at the desired temperature.

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