Sodium benzoate, also known as sodium benzoate, is an organic compound and the sodium salt of benzoic acid. Sodium benzoate is a white granular or crystalline powder, odorless or with a slight benzoin smell. It is highly soluble in water, and its aqueous solution is slightly alkaline. It is slightly soluble in ethanol and soluble in glycerol and methanol. When exposed to the air, it will absorb moisture. It reacts with acids to release benzoic acid, with carbonates to produce bubbles, and can also react with bases and vitamin C. The industrial methods for preparing sodium benzoate include the benzoic acid method and the toluene method. Sodium benzoate is commonly used as a preservative, corrosion inhibitor, etc., and is widely applied in water treatment, food, medicine and other fields.