The difference between DCC and CPP processes

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① Catalytic cracking process (DCC process). This process was developed by the Sinopec Petrochemical Research Institute. It uses heavy oil as raw material, uses a solid acid shape-selective molecular sieve catalyst, and performs cracking reactions under mild reaction conditions to produce low-carbon olefins or isomeric olefins and high-octane gasoline. This process draws on fluidized catalytic cracking technology, adopts catalyst fluidization, continuous reaction and regeneration technology, and has achieved industrialization. The DCC process has two operating modes - DCC-I and DCC-II. DCC-Ⅰ adopts relatively harsh operating conditions and reacts in a riser dense-phase fluidized bed reactor to produce gaseous olefins mainly propylene in maximum quantities. ； DCC-Ⅱ adopts milder operating conditions and reacts in a riser reactor to produce the largest amount of small molecular olefins such as propylene, isobutylene and isopentene, and at the same time produce high-octane high-quality gasoline. ② Catalytic thermal cracking process (CPP process). This process is a patented technology for producing ethylene and propylene developed by Sinopec Petrochemical Research Institute. Based on traditional catalytic cracking technology, it uses heavy oils such as wax oil, wax oil mixed with residual oil, or atmospheric residual oil as raw materials. It uses a riser reactor and a specially developed catalyst and a continuous reaction-regeneration cycle operation mode of fluidized transportation of the catalyst to produce ethylene and propylene under operating conditions that are gentler than steam cracking. The CPP process is developed on the basis of the catalytic cracking DCC process. Its key technology is to convert its target product from propylene into ethylene and propylene through further improvement of the process and catalyst.