Separation of olefinic hydrocarbons by molecular sieves

Claim 1

AN IMPROVED PROCESS FOR CONCENTRATING NORMAL OLEFINS FROM AN OLEFINIC STREAM AND RECOVERING SAID OLEFINS IN A SUBSTANTIAL UNISOMERIZED CONDITION WHICH COMPRISES SLURRYING A CRYSTALLINE ZEOLITIC MOLECULAR SIEVE HAVING PORE OPENINGS FROM ABOUT 4.5 TO 5.5 ANGSTROM UNITS IN A NONSORBABLE MEDIUM HAVING A BOILING POINT HIGHER THAN SAID OLEFIN, PASSING SAID SLURRY INTO AN ADSORPTION ZONE, PASSING A STREAM COMPRISING NORMAL OLEFINS INTO SAID ZONE, ADSORBING SAID OLEFINS ON SAID SIEVE, SEPARATING SAID SIEVE CONTAINING ADSORBED NORMAL OLEFINS FROM THE BULK OF SAID SLURRY MEDIUM, RESLURRYING SAID SIEVE IN A MEDIUM COMPRISING A NON-ADSORBING COMPONENT AND A SORBABLE HYDROCARBON DISPLACING AGENT, SAID SORBABLE HYHDROCARBON DISPLACING AGENT HAVING A BOILING POINT INTERMEDIATE SAID NON-SORBABLE MEDIUM AND SAID OLEFIN, PASSING SAID SLURRY INTO A DISTILLATIVE DESORPTION ZONE, SUBJECTING SAID MATERIAL TO DISTILLATION AT A SUFFICIENTLY LOW TEMPERATURE TO AVOID SUBSTANTIAL ISOMERIZATION AND POLYMERIZATION OF SAID OLEFINS, AND RECOVERING HIGH YIELDS OF SAID FIRST NAMED NORMAL OLEFIN.