A novel ethylene and propylene production technology, Catalytic Pyrolysis Process (CPP), has been developed by Research Institute of Petroleum Processing, SINOPEC on the basis of modification of DCC process via operating parameter, catalyst formulation and unit configuration, CPP is suitable for processing heavy feedstocks, such as VGO, VGO blended with residual oil, coker gas oil, deasphalted oil, and atmospheric residue, etc. A riser reactor and a specially designed zeolite catalyst are used in this technology. Both catalytic and thermal reactions take place on the dual-functional catalyst with carbonium ion and free radical reaction mechanism. Based on a great deal investigation from lab to pilot plant test, a commercial CPP unit with 80kt/a capacity was revamped from a DCC unit and the test was conducted in the last quarter of 2000 to early 2001 cooperated with SINOPEC Engineering Incorporation and PetroChina Daqing Refining & Chemical Company, The commercial results showed that 20.37wt% ethylene and 18.23wt% propylene were obtained under a reaction temperature of 913K with Daqing atmospheric residue as feedstock. CPP technology introduced some new engineering devices including quenching outlet reactants and heat recovery facilities, and paves a novel way to producing ethylene and propylene from heavy feedstock.
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