关键词: 延迟焦化装置, 丙烯精制, 聚合级丙烯, 乙烯装置, 丙烯回炼, 经济效益

Abstract:

The propylene products produced by delayed coking units are limited by their own process conditions, and conventional gas fractionation processes cannot meet the requirements for polymerization grade propylene. The high content of impurities such as sulfur and water in propylene products affects the catalyst activity of downstream polyolefin unit and cumene unit, and cannot be directly used as feedstock for chemical units. By fully leveraging the advantages of integrated refining and chemical projects and utilizing the existing unqualified propylene recycling process in the ethylene unit, a new delayed coking propylene recycling process is added to the ethylene unit. Compare and analyze the operating conditions of propylene outlet of the delayed coking unit and unqualified propylene recycling points of ethylene unit, and ensure that they have the conditions for direct recycling. Delayed coking propylene is recycled to the fourth section inlet of the cracking gas compressor of the ethylene unit, and then separated from the propylene tower through alkali washing tower, dryer, and C₃ hydrogenation reactor. After refining, it meets the requirements of polymerization grade propylene, achieving the integration and optimization of refining and chemical processes. The implementation of the project has brought considerable economic benefits to the enterprise.

Key words: delayed coking unit, propylene refining, polymerization grade propylene, ethylene unit, propylene recycling, economic benefits