System and process for converting waste plastic into fuel

A pyrolysis system for processing plastic, comprising:

• an extruder comprising an elongate cantilevered drive shaft connected to a drive coupling, the drive shaft being housed in a tubular barrel housing surrounded at least partially by one or more clamshell heaters, wherein the drive shaft includes auger flights;
• and
• a reactor configured to process pre-processed material supplied via the extruder at an input end, the reactor comprising:
• a hollow upper reactor tube including a first screw conveyor within the hollow portion of the upper reactor tube, configured to receive the pre-processed material;
• a hollow lower reactor tube connected to the upper reactor tube via a connecting collar, including a second screw conveyor within the hollow portion of the lower reactor tube, configured to receive partially pyrolyzed material from the upper reactor tube;
• and
• a plurality of clamshell heaters surrounding the upper and lower reactor tubes, defining a plurality of individual heating zones.