Anhydrous citric acid is a natural component and an intermediate product of physiological metabolism in animals and plants, and it is also one of the most widely used organic acids in food, medicine, chemical and other fields. It is colorless, transparent or translucent crystals, or granular or granular powder, odorless, and although it has a strong sour taste, it is pleasant and has a slightly astringent taste. Gradually weathered in warm air, slightly deliquescence in humid air. It is widely used as a sour agent and pharmaceutical additive for food and beverages. It can also be used as raw materials and additives for cosmetics, metal cleaning agents, mordants, non-toxic plasticizers and boiler scale inhibitors. Its main salt products include sodium citrate, calcium and ammonium salts, etc. Sodium citrate is a blood anticoagulant, and ferric ammonium citrate can be used as a blood supplement.