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Dinonylnaphthalenesulfonic acid (chemical formula C₂₈H₄₄O₃S, molecular weight 460.71) is an aromatic sulfonated compound with two nonyl groups and a sulfonic acid group attached to the naphthalene ring. At room temperature, it is a colorless to pale yellow solid or liquid solution. It is insoluble in water but readily soluble in organic solvents. It exhibits strong acidity, surface activity, and catalytic activity, and is widely used in the fields of paint catalysis, lubricant additives, surface treatment, and organic synthesis.
| Item | Specification |
| Melting point | 259.5°C |
| Boiling Point | 94–99°C |
| Density | 0.852 g/mL at 25°C |
| Flash point | 30°F |
| Vapor pressure | N/A |
| Refractive index | n₂₀/D 1.465 |
| Solubility in water | Insoluble in water. |
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