Processes are provided to produce a dilute ethylene stream and a dilute
propylene stream from a cracked gas stream. One process comprises
separating the cracked gas stream to produce a C.sub.3.sup.- stream and a
C.sub.3.sup.+ stream; hydrogenating the C.sub.2.sup.- stream in a
hydrogenation zone to remove a portion of the acetylene to produce the
dilute ethylene stream and routing the C.sub.3.sup.+ stream to storage or
other process unit. Another process comprises separating a cracked gas
stream in a depropanizer zone to form a C.sub.3.sup.- stream and a
C.sub.4.sup.+ stream; separating the C.sub.3.sup.- stream in a deethanizer
zone to form a C.sub.2.sup.- and a C.sub.3 stream; hydrogenating a portion
of the acetylene in the C.sub.2.sup.- stream in a hydrogenation zone to
produce a dilute ethylene stream; and routing the C.sub.3 stream to
storage or other process unit.
