Process of recovery of cyclopenta

Claim 1

A PROCESS FOR SEGREGATING CYCLOPENTADIENE AND METHYL CYCLOPENTADIENE FROM VAPOR PHASE HYDROCARBONS CRACKED IN THE PRESENCE OF STEAM, WHICH COMPRISES QUICKLY QUENCHING THE CRACKED HYDROCARBONS TO A TEMPERATURE BETWEEN 350* F. TO 650* F. UNDER A PRESSURE OF 0 TO 100 P.S.I.G. TO MAINTAIN C1 TO C9 HYDROCARBONS IN A VAPOR PHASE STREAM AND LEAVING SUBSTANTIALLY NONE OF THE CYCLOPENTADIENE AND METHYL CYCLOPENTADIENE AS DIMER IN THE RESULTING QUENCHED LIQUID PORTION OF THE CRACKED HYDROCARBONS, COMPRESSING AND COOLING THE THUS SEPARATE VAPOR PHASE STREAM TO TEMPERATURE BELOW 135* F. UNDER A PRESSURE OF 40 TO 210 P.S.I.G. TO CONDENSE OUT THEREFROM MOST OF THE C6+ COMPONENTS, REMOVING THE THUS CONDENSED OUT C6+ COMPONENTS INCLUDING SOME C5 AND A SMALL AMOUNT OF LOWER HYDROCARBONS FROM THE VAPOR PHASE STREAM, STRIPPING SAID LOWER HYDROCARBONS FROM THE C6+ COMPONENTS, PASSING THE RESIDUAL C6+ COMPONENTS THROUGH A SOAKING ZONE TO DIMERIZE CYCLOPENTADIENE AND METHYL CYCLOPENTADIENE MONOMER PRESENT THEREIN, FRACTIONATING FRO THE RESULTING C10 AND C12 DIMERS OTHER C5 THROUGH C9 HYDROCARBONS TO OBTAIN A DIMER CONCENTRATE, PASSING THE SAID DIMER CONCENTRATE INTO A DEDIMERIZATION ZONE AND SEPARATING RESULTING MONOMERS OF CYCLOPENTADIENE AND METHYL CYCLOPENTADIENE BY FRACTIONAL DISTILLATION.