As we all know, the oily substances in food are mainly composed of fat and oil. Generally, the liquid at room temperature is called oil, and the solid material at room temperature is called fat. Fatty acids are a class of compounds composed of three elements, carbon, hydrogen and oxygen, and their main components are neutral fats, phospholipids and glycolipids. Fatty acids are divided into three categories: saturated fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids. Fatty acid purification, as the name implies, is to extract the fatty acids in the fat from the fats of animals and plants through the fatty acid purification equipment to obtain high-quality fatty acids.