There are several broad classes of materials available for use in creating a chemical reactor. Temperature control is one of key functions of a chemical reactor. The reaction takes place in a chemical reactor. At first it was intended to be a companion to a chemical reactor design course. Chemical reactor materials selection is an important aspect in the design of a chemical reactor. The design of a chemical reactor deals with multiple aspects of chemical engineering. Effluent, in engineering, is the stream exiting a chemical reactor. Reactive distillation is a process where the chemical reactor is also the still. This heat can be used to heat the reagents before they enter the chemical reactor. A chemical reactor may also be a fluidized bed; see Fluidized bed reactor. A chemical reactor is an enclosed volume in which a chemical reaction takes place.