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Deep Catalytic Cracking (DCC)Sinopec Tech
Introduction
Deep Catalytic CrackingDCCis a catalytic
conversion technology which uses heavy hydro-
carbon feedstocks, such as VGO, VR or VGO
blended with DAO to produce light olefins
(ethylene, propylene and butylenes), LPG, gaso-
line, and middle distillates etc. The technology
mainly targets maximizing production of propyl-
ene (DCC-) or maximizing production of iso-
olefins (DCC-). DCC process broke the limita-
tion of conventional FCC process, and the pro-
pylene yield of DCC is 3-5 times of that of con-
ventional FCC. The process scheme of DCC is
similar to that of conventional FCC consisting of
reaction-regeneration, fractionation and gas con-
centration sections. Feedstock dispersed with
steam is fed to the system, then contacted with
the hot regenerated catalyst either in a riser plus
fluidized dense bed reactor (for DCC-) or in a
riser reactor (for DCC-) and is catalytically
cracked. Reactor effluent proceeds to the frac-
tionation and gas concentration sections for
stream separation and further recovery. The
coke-deposited catalyst is stripped with steam
and transferred to a regenerator where air is in-
troduced and the coke on the catalyst is re-
moved by combustion. The hot regenerated
catalyst is returned to the reactor at a controlled
circulation rate to achieve the heat balance of
the system.Features of Technology
DCC has two reactor operating modes:DCC-I (Riser plus fluidized
dense bed reac-
tor, maximum propylene mode) and DCC-II
(Riser reactor, maximum iso-olefins mode).
DCC can process different heavy feeds
(VGO, deasphalted oil, coker gas oil, atmos-
pheric residue, vacuum residue, etc.), and
paraffinic feedstocks are the best feeds for
DCC. In DCC maximum propylene opera-
tion mode, over 20w% propylene yield can
be obtained from paraffinic feedstocks. The
naphtha and middle distillates streams from
DCC unit can be used as blending compo-nents of high octane
number commercial
gasoline and fuel oil, respectively.
As employing specially designed and pat-ented zeolite catalysts,
the reaction tem-
perature in DCC is higher than that of con-
ventional FCC, but much lower than that of
steam cracking.
Flexibility of process operation. Easy to ob-tain the shift of
DCC operation modes by
regulating the operating conditions and
catalyst formulations.
Easy of separation and recovery of productstreams through a
similar absorption/
fractionation of conventional FCC. It is not
necessary to use cryogenic separation of
steam cracking for the separation and re-
covery of DCC product stream.
Impurity hydrocarbons are trace in DCClighter olefin products,
and hydrotreating isnot needed.
Commercial ExperienceThe first commercial DCC unit was put into
pro-
duction in 1990, and ten DCC units have been
licensed and the largest one among them is
4.50MMTA. It is estimated that there will be to-
tally 13 units in operation by the end of 2010. Technological
Services
Turn-key project or process design package can
be provided as well as technical consulting,
training and on-site services. And the related
catalysts with their technical services can be of-
fered separately. For more information contact
SINOPEC TECH at:
Tel: 0086-10-84275257
Fax: 0086-10-84271847
Website: www.sinopectech.com
Email: [email protected]
DCC
2009 SINOPEC TECH All Rights ReservedThis information is offered
only for customers consideration. It is not taken as a warranty for
which SINOPEC or
SINOPEC TECH undertakes legal responsibility, or as permission
to use the technology without a license.
http://www.sinopectech.com/mailto:[email protected]:[email protected]://www.sinopectech.com/
