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 English: Adipic acid. Molecular formula: C6H10O4. Molecular weight: 146.14. Chinese alias: adipic acid (capacitor grade); to sublimation, also known as fatty acid. CAS :124-04-9. 
 Properties: white crystalline powder, microstrip sour, melting point 153 ℃, its density 1.360g/cm3, mp153 ℃, normal boiling point 337.5 ℃, begins to decompose at 330.5 ℃, flash point of 210 ℃, 191 ℃ (closed) 
 Usage: buffer; neutralizer; acidifying agent; flavoring agent. 
 As a food acidulant, esters and textile treatment agent; 
 Used in medicine, pesticides, fragrances, adhesives and flux and production. 
 Limited: Solid beverage 0.01g/kg gum 4.0mg/kg 
 Solubility slightly soluble in water, soluble in alcohol, ether, etc. Most organic solvents. 
 The solubility of adipic acid in water varies with temperature greater when the solution temperature from 28 ℃ up to 78 ℃, its solubility can be increased 20 times. 15 ℃, the solubility of 1.44g/100mL; 25 ℃ when the solubility of 2.3g/100mL; 100 ℃ when the solubility of 160g/100mL. 
 Main purpose of raw materials for synthetic polymers, plasticizers and lubricants are also used for system 
 Adipic acid is a white crystalline solid. Soluble in alcohol, ether, soluble in acetone, slightly soluble in cyclohexane and benzene. When the quality of adipic acid in the oxygen content higher than 14% is easy to produce static electricity caused by fire. Adipic acid dust explosion in the air quality levels ranging from 3.9% -7.9%. Adipic acid is a dibasic acid in most applications the value of dicarboxylic acids, can occur as the salt reaction, esterification, amidation reaction and with diamines or diols into polymers such as condensation . 
 White crystals, mp 153.0 ~ 153.1 ℃. Is a significant industrial dicarboxylic acid, dicarboxylic acid in the production of all second place. The main system for production of adiponitrile and then diamine, hexamethylene diamine together with the production of nylon 66 (see polyamide). 
 In addition, for the production of unsaturated polyester, hexanediol and adipic acid ester. 
 In 1937, the United States DuPont cyclohexanol with nitric oxide (obtained by the hydrogenation of phenol), first realized industrial production of adipic acid. Into the 1960s, the industry gradually switch to cyclohexane oxidation, that is, the system first by intermediate products of cyclohexane and cyclohexanone cyclohexanol mixture (ie, ketone alcohol oil, also known as KA oil), then the KA oil nitric acid or air oxidation. 
 Catalyst for the reaction with copper - vanadium (0.1% to 0.5% copper, 0.1% to 0.2% vanadium), temperature 60 ~ 80 ℃, pressure 0.1 ~ 0.4MPa. Theoretical yield of 92% to 96%. KA oil oxidation products of distillation of nitric acid, and then refined through two crystals can be obtained for high purity adipic acid. 
 Based on air oxidation of copper acetate and manganese acetate as a catalyst, acetic acid as solvent, the direct oxidation of KA oil with air. Generally use two reactors in series: the first stage reaction temperature 160 ~ 175 ℃, pressure 0.7MPa (gauge pressure), reaction time of about 3h; second stage reaction temperature 80 ℃, pressure 0.7MPa (gauge pressure), reaction time of about 3h. Refined by two crystalline oxidation products, recycling of the solvent can be treated and recycled. The law very selective method with nitric acid, nitric acid method without strong corrosion problems, but the response time is four times the nitric acid method, so it is still small.