Production of a new process for ethylene propylene

The ethylene and propylene technology and industrial application projects for catalytic pyrolysis jointly developed by the Petrochemical Academy of Sciences, Petrochemical Engineering Construction Company and PetroChina Daqing Petrochemical Co., Ltd. have recently passed China Petroleum & Chemical Corporation, China National Petroleum Corporation Joint organization of technical appraisals.

Catalytic thermal cracking (abbreviated as CPP) is a continuous reaction-regeneration cycle operating mode in which a heavy oil is used as a raw material, a specially developed molecular sieve catalyst is used for fluidized transport of the catalyst, and a much more moderate operating condition than that of conventional steam cracking and ethylene production. A new process route for the production of ethylene and propylene.

The catalytic pyrolysis process has been systematically researched and developed. The industrial trials have been successfully carried out on an 80 kt/yr riser/catalyst cracker in Daqing. Using Daqing wax oil mixed with 55% vacuum residue as raw material, the yields of ethylene, propylene and butene obtained were 20.37%, 18.32% and 7.52% respectively, indicating that the CPP process is mature and the technology reliable.

The special catalyst developed has good cracking activity, olefin selectivity, anti-metal contamination performance and excellent hydrothermal stability. Newly developed reactor outlets have achieved good results in high temperature oil and gas quenching, heat recovery and anti-coking systems. The cracking gas low-pressure, medium-cooled, staged oil absorption process method is used for the separation and recovery of CPP gas to meet the technical requirements, and the ethylene recovery rate reaches 99%.

The CPP process is a new way to develop petrochemicals with heavy raw materials, and this process has advanced international standards.