SODIUM 2-METHYLNAPHTHALENE-1-SULFONATE

Sodium 2-methylnaphthalene-1-sulfonate is an anionic aromatic sulfonate salt derived from methylnaphthalene, widely used as a surface-active agent in industrial formulations.
Sodium 2-methylnaphthalene-1-sulfonate's structure combines a hydrophobic fused-ring naphthalene system with a strongly ionized sulfonate group, giving the molecule amphiphilic character and high affinity for both aqueous phases and hydrophobic solid surfaces.
Sodium 2-methylnaphthalene-1-sulfonate helps prevent particle agglomeration, improves dispersion uniformity, and enhances formulation stability in systems such as dyes, pigments, construction chemicals, agrochemical formulations, and polymer dispersions.

CAS number: 827-95-0
EC number: 212-590-6
Molecular formula: C11H9NaO3S
Molecular weight: 272.25 g/mol

Synonyms: Sodium methylnaphthalenesulfonate, Sodium methylnaphthalenesulphonate, Methylnaphthalenesulfonic acid, sodium salt, Naphthalenesulfonic acid, methyl-, sodium salt, EINECS 247-564-6, Naphthalenesulfonic acid, methyl-, sodium salt (1:1), RefChem:887693, Sodium methylnapthalenesulfonate, REDI PRO Glass and Counter Cleaner, Naphthalenesulfonic acid, methyl, sodium salt, Sodium mono-and dimethyl naphthalene sulfonate, 247-564-6, 977052-10-0, Sodium 2-methyl-1-naphthalenesulfonate, 26264-58-4, sodium;2-methylnaphthalene-1-sulfonate, 1A0PLS266R, 118218-23-8, 1-Naphthalenesulfonic acid, 2-methyl-, sodium salt (1:1), UNII-1A0PLS266R, SCHEMBL339169, SCHEMBL29446139, sodium methylnaphthalene sulfonate, DTXSID50904100, GCNLRNBDDUYJMP-UHFFFAOYSA-M, NS00084335, Q27252145, 1-Naphthalenesulfonic acid, 2-methyl-, sodium salt (1:1), 118218-23-8, 2-Méthyl-1-naphtalènesulfonate de sodium, 247-564-6, Natrium-2-methyl-1-naphthalinsulfonat, Sodium 2-methyl-1-naphthalenesulfonate, Sodium 2-methylnaphthalene-1-sulfonate, 127670-54-6, 26264-58-4, Methylnaphthalenesulfonic acid, sodium salt, NAPHTHALENESULFONIC ACID, METHYL-, SODIUM SALT, Sodium methyl and dimethylnaphthalenesulfonate, Sodium Methylnaphthalene Sulfonate, Sodium methylnaphthalenesulfonate, sodium methylnaphthalenesulphonate, Sodium mono- and dimethyl naphthalene sulfonate

Sodium 2-methylnaphthalene-1-sulfonate is an anionic aromatic sulfonate salt derived from methylnaphthalene, widely used as a surface-active agent in industrial formulations.
Sodium 2-methylnaphthalene-1-sulfonate exhibits good water solubility and strong wetting and dispersing properties, particularly toward hydrophobic solids.
The rigid naphthalene ring system provides thermal and chemical stability, making Sodium 2-methylnaphthalene-1-sulfonate suitable for use under demanding processing conditions.

In practical applications, sodium 2-methylnaphthalene-1-sulfonate functions as a dispersant, wetting agent, and solubilizer in systems such as dyes and pigments, textile auxiliaries, agrochemical formulations, construction chemicals, and polymer dispersions.
Sodium 2-methylnaphthalene-1-sulfonate helps prevent particle agglomeration, improves dispersion uniformity, and enhances formulation stability.
Due to its anionic nature, Sodium 2-methylnaphthalene-1-sulfonate is compatible with many nonionic surfactants but may show limited compatibility with cationic systems.

Sodium 2-methylnaphthalene-1-sulfonate is an anionic sulfonated aromatic compound belonging to the naphthalene sulfonate family, designed primarily for use as a functional auxiliary rather than a classical detergent.
Sodium 2-methylnaphthalene-1-sulfonate's structure combines a hydrophobic fused-ring naphthalene system with a strongly ionized sulfonate group, giving the molecule amphiphilic character and high affinity for both aqueous phases and hydrophobic solid surfaces.
This dual nature allows Sodium 2-methylnaphthalene-1-sulfonate to interact efficiently at solid–liquid interfaces, promoting rapid wetting and improved dispersion behavior.

In formulation systems, sodium 2-methylnaphthalene-1-sulfonate acts mainly as a dispersing and penetration agent.
Sodium 2-methylnaphthalene-1-sulfonate facilitates the breakdown of agglomerates and supports the formation of fine, uniform particle distributions, particularly in systems containing pigments, dyes, mineral fillers, or organic powders.
Unlike highly foaming surfactants, Sodium 2-methylnaphthalene-1-sulfonate offers controlled surface activity with low foam tendency, which is advantageous in industrial processing where excessive foaming can hinder mixing, pumping, or application.

Sodium 2-methylnaphthalene-1-sulfonate shows good resistance to temperature variations, mechanical shear, and moderate changes in pH, enabling consistent performance in demanding industrial environments.
Sodium 2-methylnaphthalene-1-sulfonate's aromatic backbone contributes to chemical robustness, while the sulfonate group ensures long-term solubility and stability in water-based formulations.
Due to its anionic nature, Sodium 2-methylnaphthalene-1-sulfonate is typically compatible with nonionic and other anionic additives, while combinations with cationic substances require careful formulation control to avoid antagonistic interactions.

Market Overview of Sodium 2-Methylnaphthalene-1-Sulfonate:
The global market for anionic sulfonated dispersants such as sodium 2-methylnaphthalene-1-sulfonate is driven by demand from key end-use sectors including construction, textiles, coatings, polymers, and agrochemicals.
As formulations in these industries increasingly require efficient wetting, dispersion stability, and reduced particle agglomeration, demand for performance surfactants and dispersing aids remains steady.

In construction chemicals, growth in infrastructure and residential projects worldwide supports consumption of specialty dispersants that improve cement and concrete performance.
In textiles, although traditional markets in some regions have matured, demand persists for auxiliaries that enhance dye uptake and color consistency, especially in value-added textile segments.
The coatings and pigments segment consistently absorbs sulfonate dispersants as formulators seek improved pigment wetting and reduced formulation defects.

Regional market dynamics also play a significant role.
Asia-Pacific, led by China and India, represents a major share due to large-scale construction activity, expanding chemical processing industries, and substantial textile manufacturing.

North America and Europe remain important markets, particularly for high-performance and regulatory-conscious formulations.
Competitive pressures encourage continuous innovation, including development of more efficient, environmentally compliant dispersants with lower toxicity and improved biodegradability.

Uses of Sodium 2-Methylnaphthalene-1-Sulfonate:
Sodium 2-methylnaphthalene-1-sulfonate is mainly used as an anionic dispersing and wetting agent in industrial formulations.
Sodium 2-methylnaphthalene-1-sulfonate is widely applied in dye and pigment systems to improve wetting, dispersion uniformity, and color strength.

In textile processing, Sodium 2-methylnaphthalene-1-sulfonate serves as an auxiliary for dyeing and printing formulations, supporting even dye penetration and stable dye baths.
Sodium 2-methylnaphthalene-1-sulfonate is also used in construction chemicals, such as cement, concrete, and gypsum-based formulations, where it helps disperse mineral particles and improve workability.
Additionally, Sodium 2-methylnaphthalene-1-sulfonate is employed in agrochemical formulations and polymer dispersions to stabilize suspensions, prevent agglomeration, and enhance overall formulation stability.

Dyes and pigments:
Sodium 2-methylnaphthalene-1-sulfonate acts as a dispersing and wetting agent, improving pigment wet-out, dispersion stability, and color uniformity.

Textile processing:
Sodium 2-methylnaphthalene-1-sulfonate functions as a dyeing and printing auxiliary, ensuring even dye penetration and stable dye baths.

Construction chemicals:
Sodium 2-methylnaphthalene-1-sulfonate disperses mineral particles in cement, concrete, and gypsum formulations, improving workability and consistency.

Agrochemical formulations:
Sodium 2-methylnaphthalene-1-sulfonate serves as a dispersant and stabilizer in suspension concentrates and wettable powders, preventing particle agglomeration.

Polymer and latex dispersions:
Sodium 2-methylnaphthalene-1-sulfonate stabilizes polymer particles and enhances dispersion quality in water-based systems.

Specialty chemical formulations:
Sodium 2-methylnaphthalene-1-sulfonate is used as a process aid to support efficient wetting and dispersion in industrial formulations.

Stability and Reactivity of Sodium 2-Methylnaphthalene-1-Sulfonate:

Chemical stability:
Sodium 2-methylnaphthalene-1-sulfonate is chemically stable under normal conditions of use, handling, and storage.

Reactivity:
No hazardous reactions are expected under normal industrial conditions.

Conditions to avoid:
Excessive heat, strong acids, and strong oxidizing environments.

Incompatible materials:
Strong oxidizing agents and strong acids.

Hazardous decomposition products:
Thermal decomposition may produce sulfur oxides (SOₓ), carbon oxides (CO, CO₂), and irritating fumes.

Handling and Storage of Sodium 2-Methylnaphthalene-1-Sulfonate:

Handling:
Handle in accordance with good industrial hygiene practices.
Minimize dust formation and avoid direct contact with eyes and skin.

Storage:
Store in a cool, dry, and well-ventilated area.

Storage conditions:
Keep containers tightly closed and protect from moisture and excessive heat.

Packaging materials:
Suitable plastic or lined containers are recommended.

Shelf life:
Long shelf life when stored under recommended conditions.

First Aid Measures of Sodium 2-Methylnaphthalene-1-Sulfonate:

Inhalation:
If dust is inhaled, move the affected person to fresh air.
Seek medical attention if symptoms persist.

Skin contact:
Wash the affected area thoroughly with soap and water.
Seek medical advice if irritation occurs.

Eye contact:
Rinse eyes cautiously with clean water for several minutes.
Seek medical attention if irritation persists.

Ingestion:
Rinse mouth with water.
Do not induce vomiting.
Seek medical advice if discomfort occurs.

Firefighting Measures of Sodium 2-Methylnaphthalene-1-Sulfonate:

Suitable extinguishing media:
Water spray, foam, dry chemical powder, or carbon dioxide (CO₂).

Specific hazards:
Combustion may release irritating and toxic gases such as sulfur oxides and carbon oxides.

Protective equipment for firefighters:
Self-contained breathing apparatus and full protective clothing.

Firefighting instructions:
Cool containers exposed to fire with water spray to prevent rupture.

Accidental Release Measures of Sodium 2-Methylnaphthalene-1-Sulfonate:

Personal precautions:
Wear appropriate personal protective equipment.
Avoid dust generation.

Environmental precautions:
Prevent entry into drains, surface water, or soil.

Methods for cleanup:
Collect spilled material mechanically or absorb with inert material.
Dispose of in accordance with local regulations.

Exposure Controls / Personal Protective Equipment of Sodium 2-Methylnaphthalene-1-Sulfonate:

Engineering controls:
Provide adequate general and local exhaust ventilation in handling areas.

Respiratory protection:
Use a dust mask or appropriate respirator if dust generation occurs.

Hand protection:
Chemical-resistant protective gloves are recommended.

Eye protection:
Safety goggles should be worn to prevent eye contact.

Skin protection:
Protective work clothing should be used to avoid prolonged or repeated skin contact.

Identifiers of Sodium 2-Methylnaphthalene-1-Sulfonate:
CAS number: 827-95-0
EC number: 212-590-6
Molecular formula: C₁₁H₉NaO₃S
Molecular weight: Approximately 272.25 g/mol
Physical form: Solid
Color: White to off-white
Odor: Odorless or faint characteristic odor
Intended use: Industrial dispersant, wetting agent, and formulation auxiliary

IUPAC Name: 2-methylnaphthalene-1-sulfonic acid
Canonical SMILES: CC1=C(C2=CC=CC=C2C=C1)S(=O)(=O)O
InChI Key: WODGMMJHSAKKNF-UHFFFAOYSA-N
EC Number: 255-472-2
Exact Mass: 222.03500
H-Bond Acceptor: 3
H-Bond Donor: 1

Product Name: Sodium naphthalene-1-sulfinate
CAS No.: 64326-13-2
Molecular Weight : 214.22
MDL No.: MFCD24113320
Purity/ Specification: 97%
Molecular Formula: C10H7NaO2S
Storage: Keep in dark place, inert atmosphere, room temperature
SMILES Code: O=S(C1=C2C=CC=CC2=CC=C1)[O-].[Na+]

Product Number: M1408
Purity / Analysis Method: >98.0%(T)(HPLC)
Molecular Formula / Molecular Weight: C4H7NaO3S = 158.15 
Physical State (20 deg.C): Solid
Storage Temperature : Room Temperature (Recommended in a cool and dark place, <15°C)
CAS RN: 1561-92-8
Reaxys Registry Number: 3722657
PubChem Substance ID: 87573357
MDL Number: MFCD00065344

Molecular formula: C11H9NaO3S
Average mass: 244.240
Monoisotopic mass: 244.017009
ChemSpider ID: 4576301

Other(deleted CASRN): 127670-54-6
ECHA EINECS - REACH Pre-Reg: 247-564-6
FDA UNII: 1A0PLS266R
Nikkaji Web: J178.664D
Molecular Weight: 244.24509928
Formula: C11 H9 Na O3 S

Properties of Sodium 2-Methylnaphthalene-1-Sulfonate:
Physical state: Solid
Appearance: Free-flowing crystalline or amorphous solid
Color: White to off-white
Odor: Odorless or faint characteristic odor
Chemical type: Anionic aromatic sulfonate
Molecular weight: Approximately 272.25 g/mol
Solubility: Readily soluble in water; insoluble in most non-polar organic solvents
pH (aqueous solution): Neutral to slightly alkaline
Ionic character: Anionic

Assay: 95.00 to 100.00
Food Chemicals Codex Listed: No
Flash Point: 32.00 °F. TCC ( 0.00 °C. ) (est)
logP (o/w): 2.161 (est)

Molecular Weight: 244.24 g/mol
Hydrogen Bond Donor Count: 0
Hydrogen Bond Acceptor Count: 3
Rotatable Bond Count: 1
Exact Mass: 244.01700960 Da
Monoisotopic Mass: 244.01700960 Da
Topological Polar Surface Area: 65.6 Ų
Computed by Cactvs 3.4.8.24 (PubChem release 2025.09.15)
Heavy Atom Count: 16
Complexity: 323
Isotope Atom Count: 0
Defined Atom Stereocenter Count: 0
Undefined Atom Stereocenter Count: 0
Defined Bond Stereocenter Count: 0
Undefined Bond Stereocenter Count: 0
Covalently-Bonded Unit Count: 2
Compound Is Canonicalized: Yes

Specifications of Sodium 2-Methylnaphthalene-1-Sulfonate:
Appearance: White to Almost white powder to crystal
Purity(HPLC): min. 98.0 area%
Purity(Ion exchange titration): min. 98.0 %