A process for pyrolysis of a mixed plastic stream that contains polyvinyl chloride (PVC) is provided in which the chloride from PVC is removed from an initial melting reactor that melts the mixed plastic stream. Chloride is removed in a vapor stream from the initial melting reactor with additional chloride removed from addition of sorbents to the pyrolysis reactor and in adsorbent beds downstream of the pyrolysis reactor. The pyrolysis reactor has a configuration comprising two cylindrical ring structures, an inner cylindrical ring structure within an outer cylindrical ring structure wherein a circulation liquid supply stream enters said pyrolysis reactor tangentially relative to a ring edge of said two cylindrical ring structures and wherein solid particles move in a downward direction to a bottom of the pyrolysis reactor.