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Specifications of Naphthalene-2-sulfonic acid丨CAS 120-18-3
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Appearance |
Off-white crystal |
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Purity (HPLC) |
98.0% max |
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Iron ion |
20 ppm max |
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Free Acid |
2% max |
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Water |
35% max |
Transport Information of Naphthalene-2-sulfonic acid丨CAS 120-18-3
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Parameter |
Specification |
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UN Number |
2583 |
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Class |
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Packing Group |
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H.S. Code |
2922210000302 |
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Stability & Reactivity |
The product is chemically stable under standard ambient conditions. |
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Storage |
Tightly closed. Store in a closed, dry, ventilated place |
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Condition to Avoid |
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Package |
Applications
1. Dye and Pigment Industry
A key intermediate in azo dye synthesis.
Naphthalene-2-sulfonic acid丨CAS 120-18-3 reacts with diazonium salts to form azo dyes, widely used in textiles, leather, and paper.
Enhances water solubility and color fastness of dyes due to the sulfonic acid group.
2. Dispersing Agent Manufacturing
Used to prepare naphthalene sulfonate formaldehyde condensates (NSFCs).
These are effective dispersing agents in:
Concrete admixtures (superplasticizers)
Ceramic slurries
Textile dye baths
Improves workability, flow, and uniformity of suspensions.
3. Pharmaceutical and Agrochemical Intermediate
Acts as a synthetic intermediate in the preparation of active pharmaceutical ingredients (APIs) and crop protection compounds.
Useful in building aromatic sulfonated scaffolds that improve solubility and bioavailability.
4. Surfactant and Detergent Industry
Precursor to anionic surfactants, especially in formulations where strong acidic functionality is needed.
Enhances wetting, foaming, and emulsification in specialty formulations.
5. Polymer and Resin Modification
Incorporated into water-dispersible polymers to introduce anionic character, improving stability in aqueous systems.
Can modify resin solubility, ionic interaction, or UV-resistance.
6. Electroplating and Metal Processing
Serves as an additive in electroplating baths to influence deposit morphology or bath conductivity.
Acts as a complexing agent or pH buffer in certain metal treatments.
Benefits
1. Excellent Water Solubility
The sulfonic acid group ensures high solubility in water, making it suitable for aqueous industrial processes.
2. Chemical Versatility
Reactive at the sulfonic acid site and the naphthalene ring, allowing for:
Diazotization
Coupling reactions
Condensation polymerization
This enables wide application in dye synthesis, chemical modification, and polymer engineering.
3. Environmental and Processing Compatibility
Used to produce low-formaldehyde dispersants, aiding compliance with environmental standards in construction and coatings industries.
Its derivatives often exhibit biodegradability and low toxicity.
4. Improved Product Performance
In dyes: enhances brightness, shade variation, and wash-fastness.
In dispersants: improves dispersion stability, fluidity, and suspension uniformity.
In surfactants: boosts cleaning performance and rinsability.
Conclusion
Naphthalene-2-sulfonic acid丨CAS 120-18-3 is a highly functional aromatic sulfonic acid widely used in the dye, dispersant, surfactant, and polymer industries. Its excellent water solubility, reactive sulfonic group, and aromatic stability make it a critical intermediate in synthesizing performance-enhancing products. Whether in textile dyeing, concrete plasticizers, or chemical synthesis, it provides cost-effective, versatile functionality with broad industrial impact.
