Product use: mainly used for dyeing and printing industry, pharmaceutical, photographic, electroplating, chemical reagent and used as organic synthesis of esterification agent such as organic synthesis and pharmaceutical, medicine, printing and dyeing in photography mordant, buffer, chemical reagents, meat preservative, pigment, tanned leather can be used in many aspects, such as making all kinds of chemical products, such as ester furanacrylic acid, acetic acid and chloroacetic acid. As a buffer for flavoring, this product can alleviate bad smell and prevent discoloration, and has anti-mildew effect. It can also be used as sour agent for sauces, sauerkraut, mayonnaise, fish cake, sausage, bread paste, etc. Mixed with methyl cellulose, phosphate, etc., used to improve the preservation of sausage, bread, cake, etc.