Adipic acid, also known as fatty acid, is an important organic dibasic acid with the structural formula HOOC(CH2)4COOH. It can take place in salt formation reaction, esterification reaction, amidation reaction, etc., and can be polycondensed with diamine or glycol to form high molecular polymer. Adipic acid is a dicarboxylic acid of great industrial significance. It plays an important role in chemical production, organic synthesis industry, lubricant manufacturing, etc. Its output ranks second among all dicarboxylic acids.