Process of producing cyclodiene monomers from polymer-containing streams

Claim 1

IN A PROCESS FOR SEGREGATING HIGH PURITY CYCLOPENTADIENE FROM HYDROCARBON CRACKED IN THE PRESENCE OF STEAM, WHEREIN THE CRACKED HYDROCARBON-STEAM MIXTURE IS QUENCHED TO A TEMPERATURE IN THE RANGE OF 550*F. TO 650*F. AND DISCHARGED INTO A MIDSECTION OF A LOW-PRESSURE FRACTIONATING ZONE, THE IMPROVEMENT WHICH COMPRISES COLLECTING FROM OVERHEAD DISTILLATES OF SAID ZONE A FRACTION HAVING A HIGH CONTENT OF POLYMERS AND COPOLYMERS FORMED FROM DIOLEFINS HAVING 5 TO 7 CARBON ATOMS STRIPPING FROM SAID FRACTION C5 AND C6 CYCLODIENE MONOMERS, PASSING A RESIDUAL PORTION OF SAID POLYMERS AND COPOLYMERS INTO A HEATING ZONE WHERE DIMERS OF SAID DIOLEFINS ARE CRACKED INTO MONOMERS, REMOVING SAID MONOMERS FORMED BY CRACKING FROM THE RESIDUAL PORTION OF THE POLYMERS AND COPOLYMERS, THEN PASSING THE REMAINING RESIDUE OF THE POLYMERS AND COPOLYMERS INTO SAID LOW-PRESSURE PRIMARY ZONE WHERE SAID POLYMERS AND COPOLYMERS CONTACT AN ENTERING STREAM OF THE CRACKED HY-