Mainly used in food and beverage industry as sour agents, flavoring agents and preservatives, preservative. Also the chemical industry, cosmetics industry and the industry as a washing antioxidants, plasticizers, detergents [packaging] 25 kg bags, 25 lb bags, 1000kg pallet packing bags [storage] dark, closed, dry and cool place storage. [Quality standard] BP98, E330, USP24, enterprise standard physical and chemical properties: relative density 1.542, melting point 153 ℃ (dehydration), the refractive index of 1.493 ~ 1.509 colorless translucent crystals or white granules or white crystalline powder, often part containing crystal water, odorless, very sour taste, soluble in water, alcohol in its calcium salt in cold water than hot water easily dissolved, the nature of the citric acid used to identify and separate. Crystallization temperature control suitable for anhydrous citric acid obtained. Acidic aqueous solution. In the dry air of slight weathering in humid air deliquescence. Decomposition above 175 ℃ water and carbon dioxide release