The present invention relates to a catalytic cracking process and a device
used in the process in particular, the present invention provides a
catalytic cracking process, which comprises which comprises: 1)
catalytic cracking a feedstock in the first riser for less than about 1.5
second and sending the resultant stream into the first separating
device,; 2) catalytic cracking the recycle oil obtained from the first
separating device in the second riser for less than about 1.5 second and
sending the resultant stream into the first separating device; and 3)
carrying out catalytic reaction of the crude gasoline stream and/or
optionally the diesel oil stream obtained from first separating device in
the third riser; wherein the reaction conditions and the catalysts used
in the first to third risers are selected according to the requirement
for the product of the catalytic cracking process, and the catalyst
regeneration and recycle systems are formed respectively for the
catalysts used in the first to third risers, so as to effectively improve
the product distribution of the catalytic cracking process and the
quality of the target product.