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Adipic acid or hexanedioic acid is the organic compound with the formula (CH 2) 4 (COOH) 2.From an industrial perspective, it is the most important dicarboxylic acid: about 2.5 billion kilograms of this white crystalline powder are produced annually, mainly as a precursor for the production of nylon.
This process coforms cyclohexanone, and this mixture ("KA oil" for ketone-alcohol oil) is the main feedstock for the production of adipic acid. The oxidation involves radicals and the intermediacy of the hydroperoxide C 6 H 11 O 2 H. Alternatively, cyclohexanol can be produced by the hydrogenation of phenol: C 6 H 5 OH + 3 H 2 → C 6 H 11 OH
1,6-Hexanediol is industrially made by the hydrogenation of adipic acid or its esters. [ 3 ] [ 5 ] Laboratory preparation could be achieved by reduction of adipates with lithium aluminium hydride , although this method is impractical on a commercial scale.
The demand for adipic acid is expected to be driven by an increase in the need for electronic goods in the near future. Adipic Acid Industry Overview. The global adipic acid market is observed by its widespread application in the production of nylon 6,6, polyurethane and various other industrial products. It is used with better mechanical ...
The expanding packaging industry, driven by e-commerce growth and increasing consumer demand for packaged goods, boosts the demand for adipic acid. Growing Construction Sector: Adipic acid is employed in the production of polyurethane foams and coatings used in construction materials such as insulation panels and coatings. The growth in ...
Nylon 66 is synthesized by polycondensation of hexamethylenediamine and adipic acid. Equivalent amounts of hexamethylenediamine and adipic acid are combined in water. In the original implementation, the resulting ammonium/carboxylate salt was isolated and then heated either in batches or continuously to induce polycondensation.
The great majority of the diamine is consumed by the production of nylon 66 via condensation with adipic acid. Otherwise hexamethylene diisocyanate (HDI) is generated from this diamine by phosgenation as a monomer feedstock in the production of polyurethane. [9] [10] The diamine also serves as a cross-linking agent in epoxy resins. [11] [12] [13]
This process forms cyclohexanol as a by-product, and this mixture, called "KA Oil" for ketone-alcohol oil, is the main feedstock for the production of adipic acid. The oxidation involves radicals and the hydroperoxide C 6 H 11 O 2 H as an intermediate. In some cases, purified cyclohexanol, obtained by hydration of cyclohexene, is the precursor.