Citric acid is an important organic acid, also known as citric acid, colorless crystals, often with part of the crystal water, odorless, has a strong acidity, soluble in water. The calcium salt in cold water than hot water soluble, this property is often used for identification and separation of citric acid. Crystallization control suitable temperature can get anhydrous citric acid. In the industry, food industry, cosmetic industry has many uses.

Citric acid is the organic acid in the first big acid, due to physical properties, chemical properties, derivatives of the performance, is widely used in food, medicine, daily chemical and other industries the most important organic acid.