It is widely known that polypropylene (PP) can be divided into Homo-polymer PP (homo PP), Copolymer PP (co PP), and Random copolymer PP (ra PP) based on their different molecular structures. Furthermore, PP can be also divided according to its applications, such as raffia, injection, fiber, pipe, and so on. Additionally, it can be further classified based on its melt index. As a result, PP can be considered as a collection of numerous varieties. During the plant operation, different products can be produced by switching production lines, allowing for self-adjustment to avoid the problem of oversupply or shortage of a single variety. However, in reality, petrochemical companies have their own production plans, and there may also be unforeseen circumstances, such as temporary shutdowns, that can lead to significant uncertainties in PP production scheduling.