[[Chemical reaction engineering]] is the branch of chemical engineering which deals with chemical reactors and their design, especially by application of [[chemical kinetics]] to industrial systems.
* Concentrations of chemical species (C<sub>1</sub>, C<sub>2</sub>, C<sub>3</sub>, ... C<sub>n</sub>)
* Heat transfer coefficients (h, U)
A chemical reactor, typically tubular reactor, could be a [[packed bed]]. The packing inside the bed may have [[catalyst]] to catalyze the chemical reaction. A chemical reactor may also be a [[fluidized bed]]; see [[Fluidized bed reactor]].