Refining lumped model

It is recommended to read Chen Junwu’s book on catalytic cracking processes and engineering

Lumped-parameter process model: Theoretically or empirically, it is believed that a representative point can be selected to represent the state of the entire system, and a process model is established based on this point. In chemical processes, the entire reaction process is represented by reactions involving representative components; the kinetic equations governing the reactions between these components can be determined through experiments. A model that describes complex chemical reactions in this manner is called a lumped-parameter model. For example, the production of gasoline and diesel through heavy oil cracking involves very complex reactions. However, the reaction components can be aggregated as heavy oil, gasoline, diesel, gas, and coke, and the kinetic relationships among them can be determined. This is a type of simple lumped-parameter model that is still used by early straight-wire models today. For noun explanations, you can simply search on Baidu; the information above comes from Baidu Baike

Aggregation involves classifying crude oil into light oil and heavy oil based on molecular dynamics properties; light oil is further divided into alkanes, naphthenes, aromatics, and aromatic substituents, while heavy oil is classified into alkanes, naphthenes, aromatics with two rings or fewer, aromatics with more than two rings, and aromatic substituents. The products are categorized as gases, gasoline, and coke – this is what is meant by the eleven aggregations