What is the meaning of "three links and one reaction" in the principle of chemical engineering?

In the principle of chemical engineering, "three links and one reaction" is an important concept, which summarizes many common phenomena and operations in chemical engineering. "Three links" refer to momentum transfer, heat transfer and mass transfer. Momentum transfer: it involves the processes of fluid transportation, filtration, sedimentation and solid fluidization, and they follow the basic laws of fluid dynamics. For example, the flow of fluid in the pipeline or the rotary motion in centrifugal pumps, centrifuges and other equipment belong to the process of momentum transfer. Heat transfer: It involves the processes of heating, cooling, evaporation and condensation, and they follow the basic laws of heat transfer. For example, changing the temperature of a substance by heating or cooling, or realizing the phase change of a substance by evaporation or condensation all belong to the process of heat transfer. Mass transfer: involves distillation, absorption, extraction, drying and other processes, and follows the basic laws of mass transfer. For example, by distillation, the components in the mixture can be separated; The removal of a component in a gas mixture is achieved by absorption; Through extraction, the components in the solution are separated; Solid drying and dehydration belongs to mass transfer process. "One reaction" refers to the chemical reaction process, that is, various chemical reactions that occur in the chemical process. "Three exhibitions and one reaction" summarizes all the characteristics of chemical production process and is the core content of chemical principle.