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

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

• directing the plastic feedstock into an internal volume of a reactor vessel;
• and
• pyrolyzing the plastic feedstock in the internal volume of the reactor vessel;
• wherein the step of pyrolyzing the plastic feedstock comprises:
• using one or more heaters to heat the plastic feedstock in the reactor vessel's internal volume to a temperature of 200° C. or more;
• using the one or more heaters to apply energy at a combined energy density between 0.05 and 0.7 kW per pound of pyrolyzed product produced within the reactor;
• and
• pyrolyzing the plastic feedstock during a period of 12 days or more with a system availability factor of 90% or more.