The microwave heating is even and the heating efficiency is high. The microwave can heat the heated material inside and outside together, avoiding the cold center phenomenon produced by the conventional heating, low heat loss, and high thermal energy utilization. Microwave heating can reduce the chemical reaction temperature and reduce process energy consumption. Microwaves can cause atoms and molecules to vibrate at high speeds, create more favorable thermodynamic conditions for chemical reactions, catalyze chemical reactions, enable reactions to occur at lower temperatures, and reduce process energy consumption. Microwave clean and environmentally friendly.