Liquefying and dehalogenating waste plastics

A waste plastic dehalogenation process comprising:

• (a) liquefying solid waste plastic in a melt tank to produce a liquefied waste plastic;
• (b) circulating said liquified waste plastic through a circulation loop external to the melt tank, said circulation loop including a halogen stripper;
• (c) sparging a stripping gas into said halogen stripper and through the liquefied waste plastic in the external halogen stripper to produce a multi-phase mixture, wherein sparging uses a sparger inside the halogen stripper, wherein the sparger comprises a sparger tube and sparger apertures, wherein the sparger apertures are positioned below a lateral axis of the sparger tube at an angle from 10 to 50 degrees relative to a horizontal axis;
• and
• (d) disengaging a gaseous phase from a liquid phase of said multi-phase mixture to thereby provide a halogen-enriched gaseous material and a halogen-depleted liquefied waste plastic.