mainly used as a food preservative in the food industry for soy sauce, vinegar, salt pickles, fruit juice, jam, fruit wine, canned food, soft drinks, syrup, beverages, tobacco and other anti-corrosion. The pharmaceutical industry for the preparation of sedative drugs such as caffeine and sodium benzoate, and is used in the pills syrup corrosion. Is also used to rust-proof paper, latex paint, shoe polish, glue, fabric anti-corrosion and anti-mildew. In addition, can also be used in the manufacture of mordant dye industry, plastics industry, used as a plasticizer as well as the spice of industrial raw materials. As a chemical reagent, used as a serum bilirubin test cosolvent.