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Azelaic acid (MF: C₉H₁₆O₄, MW: 188.22) is a saturated, straight-chain dicarboxylic acid containing 9 carbon atoms; its chemical name is 1,7 -heptanedicarboxylic acid. It occurs naturally in rhododendrons, wheat, barley, rye, and in the metabolites of Malassezia fungi on the skin surface. Currently, it is primarily produced industrially through the ozone decomposition of oleic acid or the nitric acid oxidation method. At room temperature, it appears as white to pale yellow flaky crystals or a crystalline powder. It is odorless and exhibits the typical acidity and chemical reactivity associated with its dicarboxylic structure, making it a versatile raw material in the pharmaceutical, cosmetic, and chemical industries.
| Item | Specification |
| Melting Point | 106.5-109℃ |
| Boiling Point | 286℃(100 mmHg) |
| Density | 1.225 g/cm³(25℃) |
| Flash Point | 210℃ |
| Vapor Pressure | N/A |
| Refractive Index | 1.4303(110℃) |
| Solubility | Solubility in water at 20°C is 2.4 g/L; readily soluble in ethanol, acetone, and hot benzene; slightly soluble in cold water, diethyl ether, and benzene. |
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