Rotary evaporators are mainly used for concentration, crystallization, drying, separation, and solvent recovery in industries such as pharmaceuticals, chemical engineering, and biopharmaceuticals. The principle is to heat at a constant temperature under vacuum conditions, causing the rotating bottle to rotate at a constant speed. The material forms a large film on the bottle wall and evaporates efficiently. The solvent vapor is cooled by a high-efficiency glass condenser and recovered in a collection bottle, greatly improving the evaporation efficiency. Specially suitable for the concentration and purification of biological products that are prone to decomposition and denaturation at high temperatures. The product can be paired with circulating water multi-purpose vacuum pumps, diaphragm vacuum pumps, low-temperature circulation (vacuum) pumps, circulation coolers, constant temperature circulators, low-temperature coolant circulation pumps, and other system devices.