Processes and systems for producing light olefins and aromatics from a mixed plastics stream

A system for processing mixed plastics into aromatics and light olefins, the system comprising:

• an inlet stream comprising mixed plastics;
• a dechlorination unit, the dechlorination unit in fluid communication with the inlet stream and operable to:
• (i) raise the temperature of the inlet stream to a temperature between 250 and 350° C. to melt the mixed plastics and generate a liquid plastic stream;
• and
• (ii) scrub HCl released from the inlet stream;
• a pyrolysis reactor, the pyrolysis reactor in fluid communication with the liquid plastic stream discharged from the dechlorination unit and operable to raise the temperate of the liquid plastic stream to a temperature of 300 to 1,000° C. to generate hydrocarbon vapors;
• an acid gas removal reactor, the acid gas removal reactor in fluid communication with the pyrolysis reactor and operable to remove residual HCl and sulfur-containing compounds from the hydrocarbon vapors to generate a plastic derived oil, where the acid gas removal reactor comprises a reaction vessel with a solid inorganic alkali salt disposed within the reaction vessel;
• and
• a steam enhanced catalytic cracking reactor, the steam enhanced catalytic cracking reactor in fluid communication with the acid gas removal reactor and operable to crack the plastic derived oil at 600 to 700° C. to generate a product stream comprising light olefins having a carbon number of C2-C4 and aromatics.