Batch-mass reactors high conversion

Batch Mass Reactors. The batch-mass reactors used in these processes are of two types low conversion agitated kettles and high conversion static reactors with extended cooling surfaces. 

High Conversion Batch Mass Reactors. Because of the very high viscosities at high conversion, these reactors are unagitated. Temperature control therefore depends upon conduction through the polymer to extended heat transfer surfaces. Most common are the cooled plates of the plate and frame... 

The batch conversion of wood fuels with the following conversion concept overfired, updraft, fixed horizontal grate, and batch reactor, has proven to be highly dynamic and stochastic with respect to mass flow and stoichiometry of conversion gas as well as the air factors of the conversion and combustion system. 

External mass transfer limitations, which cause a decrease in both the reaction rate and selectivity, have to be avoided. As in the batch reactor, there is a simple experimental test in order to verify the absence of these transport limitations in isothermal operations. The mass transfer coefficient increases with the fluid velocity in the catalyst bed. Therefore, when the flow rate and amount of catalyst are simultaneously changed while keeping their ratio constant (which is proportional to the contact time), identical conversion values should be found for flow rate high enough to avoid external mass transfer limitations.[15]... 

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