Systems and methods for making hydrocarbon compositions derived from pyrolysis of post-consumer and/or post-industrial plastics

A reactor for pyrolysis of plastic feedstock comprising post-consumer and/or post-industrial plastics, the reactor comprising:

• a reactor vessel defining an internal volume configured for receiving and pyrolyzing the plastic feedstock;
• an agitator configured for stirring the feedstock during pyrolysis;
• one or more external heaters positioned outside the internal volume of the reactor vessel and configured for applying energy to the feedstock in the internal volume of the reactor vessel;
• one or more internal heaters positioned inside the internal volume of the reactor vessel and configured for applying energy to the feedstock in the internal volume of the reactor vessel, wherein the one or more internal heaters are substantially vertically oriented and positioned between the agitator and an internal wall of the reactor vessel;
• wherein the one or more external heaters and one or more internal heaters are collectively configured for heating the feedstock in the internal volume of the reactor vessel to a temperature of 200° C. or more;
• wherein the one or more external heaters and the one or more internal heaters are collectively configured for applying energy at a combined energy density between 0.05 and 0.7 kW per pound of pyrolyzed product produced within the reactor.