Method for catalyst-assisted microwave pyrolysis of waste plastics

A method for catalyst-assisted microwave pyrolysis of waste plastics, the method comprising:

• step (1):
• crushing a piece of waste plastic into a plurality of plastic fragments having a length between 0.2 cm and 10 cm and a width between 0.2 cm and 10 cm;
• step (2):
• mixing the plurality of plastic fragments uniformly with a catalyst substance and placing the mixed plastic fragments and catalyst substance into a microwave heating chamber, the microwave heating chamber having at least one gas inlet and at least one gas outlet, and the at least one gas outlet being connected to an external extraction device via a pipeline;
• step (3):
• performing a microwave heating process to heat the plurality of plastic fragments under an oxygen-free condition within the microwave heating chamber to form solid carbon materials and gaseous volatile substances, wherein the oxygen-free condition is formed by introducing an inert gas into the microwave heating chamber via the at least one gas inlet, and the microwave heating process is performed at a temperature between 300° C. and 600° C. for 0.1 to 1 hour;
• and
• step (4):
• transferring the solid carbon materials from the microwave heating chamber into a cooling container and directing the gaseous volatile substances from the at least one gas outlet of the microwave heating chamber into a condensation pipeline to form a fuel oil in a collection container.