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Adipic acid or hexanedioic acid CAS 1071-93-8 is the organic compound with the formula (CH2)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. Adipic acid otherwise rarely occurs in nature.

Specification
Index                                          Premium Grade           First Grade          Qualified
Appearance                                                   White crystalline powder
Content% (m / m)                         ≥99.70                     99.70                    99.50
Melting point C                              ≥ 151.5                    151.0                    151.0
ammonia water chroma, Pt-Co        ≤5                              5                          15
Moisture % (m / m)                       ≤0.20                        0.27                      0.40
Ash mg / kg                                  ≤7                             10                         35
Fe mg / kg                                    ≤1.0                          1.0                        3.0
Nitrate content mg / kg                  ≤10.0                        10.0                      50.0

Application

1.In Industrial field

Adipic acid is mainly used as monomer for the production of nylon by a polycondensation reaction with hexamethylene diamine forming nylon 66. Other major applications also involve polymers: it is a monomer for production of Polyurethane and its esters are plasticizers, especially in PVC.

2.In medicine industry

Adipic acid has been incorporated into controlled-release formulation matrix tablets to obtain pH-independent release for both weakly basic and weakly acidic drugs. It has also been incorporated into the polymeric coating of hydrophilic monolithic systems to modulate the intragel pH, resulting in zero-order release of a hydrophilic drug.

3.In food industry