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Sulfonaphthalene is an aromatic sulfonic acid derivative of naphthalene that appears as a brownish to yellowish powder, is highly soluble in water, and functions as a dispersant, surfactant, and stabilizer in various industrial applications.
Sulfonaphthalene's most important use is in the production of Sulfonaphthalene–formaldehyde condensates (SNF), which act as superplasticizers in concrete by reducing water demand, improving workability, and enhancing the strength and durability of cement-based materials.
Beyond construction, Sulfonaphthalenes serve as dispersing and wetting agents in textiles, leather, detergents, pigments, agrochemicals, and specialty formulations, valued for their chemical stability, cost-effectiveness, and versatility.
CAS Number: 532-02-5
EC Number: 208-523-8
Molecular Formula: C10H7NaO3S
Molecular Weight: 230.22
Synonyms: naphthalene-1-sulfonate, 1-naphthalenesulfonate, alpha-naphthalenesulfonate, naphthalene-1-sulfonate(1-), naphthalenesulfonate, naphthalene sulfonate, CHEBI:25474, BBL035531, BDBM50029034, STL428871, AKOS025261505, AQ-390/43296503, Q27109881, sodiumnaphthalene-2-sulfonate;2-Naphthalenesulfonicacid,sod;2-NAPHTHALENESULFONIC ACID SODIUM SALT [REAGENT FOR ION-PAIR CHROMATOGRAPHY] 98+%;2-NAPHTHALENESULFONIC ACID SODIUM SALT 99+%;Naphthalene-2-sulphonicacidsodiumsalt,tech.90%;2-NAPHTHALENESULFONICACIDSODIUMSALT,POWDER;Naphthalene-2-sulphonic acid sodium salt 95%;Beta Salt
Sulfonaphthalene is an aromatic organic compound derived from naphthalene through sulfonation, in which one or more sulfonic acid groups (–SO₃H) are introduced onto the naphthalene ring.
Sulfonaphthalene typically appears as a brown to yellowish powder or flakes, readily soluble in water and forming stable aqueous solutions.
Sulfonaphthalenes are widely used in industry, particularly as dispersing agents, wetting agents, and surfactants due to their strong ability to reduce surface tension and stabilize suspensions.
In construction and concrete technology, Sulfonaphthalene–based condensates serve as high-range water reducers (superplasticizers), improving workability and mechanical strength of concrete while lowering water content.
They are also employed in textile dyeing, leather processing, and as additives in detergents and pesticide formulations.
Sulfonaphthalene is generally stable under normal conditions but may release sulfur oxides upon thermal decomposition, requiring appropriate handling and storage in cool, dry, well-ventilated areas.
Sulfonaphthalene induces various aggregates such as spherical and elongated micelles, tubular and rodlike aggregates, as well as vesicles, when added in to the aqueous solution of a gemini surfactant C12C2C12(Me) (1,2-ethanediyl-bis-(dodecyldimethylammonium bromide)).
Sulfonaphthalene has been studied as a solute to evaluate the performance of resin particles.
Sulfonaphthalene is an organic compound with the formula C10H7SO3H.
Sulfonaphthalene undergoes many reactions, some of which are or were of commercial interest.
Upon heating with dilute aqueous acid, Sulfonaphthalene reverts to naphthalene. Fusion with sodium hydroxide followed by acidification gives 1-naphthol.
Further sulfonation gives 1,5-naphthalene-disulfonic acid.
Reduction with triphenylphosphine gives 1-naphthalenethiol.
Sulfonaphthalene is a synthetic aromatic sulfonic acid derivative of naphthalene, in which a sulfonic acid (-SO3H) functional group is covalently attached to the first carbon of the naphthalene ring system, giving it the chemical formula C10H7SO3− in its anionic form, and this specific structural arrangement imparts strong water solubility, high polarity, and anionic character, which allows Sulfonaphthalene to act as a dispersing agent, surfactant, or complexing agent in various industrial, chemical, and research applications.
Sulfonaphthalenes are characterized by excellent thermal and chemical stability, resistance to oxidation and reduction under moderate conditions, and the ability to form salts with alkali or alkaline earth metals, which enhances their versatility in aqueous systems, cement formulations, detergents, and dye dispersions, and enables them to interact with charged surfaces, metal ions, and organic molecules to reduce aggregation, improve solubility, or modify rheological properties.
Sulfonaphthalenes are derivatives of sulfonic acid that contain a naphthalene functional unit.
A subfamily of compounds are the Sulfonaphthalenes, which describes precursors to several azo dyes.
The alkylSulfonaphthalenes are used as superplasticizers in concrete.
They are produced on a large scale by condensation of naphthalenesulfonate or alkylnaphthalenesulfonates with formaldehyde.
Also called water reducers, they improves the flowability of concrete (before it sets), which allows for high-strength, high-performance concrete and mortar with lower water-to-cement ratios.
In cosmetics and personal care products, Sodium Polynaphthalenesulfonate and Sulfonaphthalene are used in the formulation of makeup preparations including eyeshadow, mascara, blushers, foundations and lipstick.
Sulfonaphthalene and Sodium Naphthalenesulfonate enhance the water solubility of other cosmetic ingredients and help to distribute or to suspend an insoluble solid in a liquid.
Sulfonaphthalene also helps to keep the final product from separating into its oil and water components.
Sulfonaphthalenes can be used in a variety of applications.
Nease Performance Chemicals provides Sulfonaphthalenes with excellent wetting and dispersing properties.
The Nease portfolio of Sulfonaphthalene includes products which vary in foaming tendency – from medium to low.
Additionally, they offer acid and base stability, hard-water tolerance, and high temperature stability.
Sulfonaphthalene is an industry leader in high-performance Sulfonaphthalenes.
Several different series of Sulfonaphthalenes are available to fit specific applications.
Sulfonaphthalenes can be utilized in water-based cleaners such as carpet shampoos, automatic dishwashing detergents, and industrial detergents, as well as in emulsion polymerization, photographic solutions, and agricultural formulations.
One grade of Sulfonaphthalene can also be used as a dispersant in many areas, which include textile chemicals, pesticide formulations, cements, emulsion polymerization, pigments and dyestuffs, and leather tanning.
In the chemical, textile, and pigment industries, Sulfonaphthalenes serve as dispersing agents for dyes, pigments, and inks, providing uniform color distribution, prevention of flocculation or sedimentation, and enhanced solubility in aqueous systems, while also acting as wetting agents or emulsifiers in detergents, textile treatments, and industrial cleaning formulations, improving surface coverage, chemical compatibility, and cleaning efficiency.
Sulfonaphthalene is a water-soluble, anionic aromatic sulfonic acid derivative of naphthalene used extensively as a superplasticizer in concrete, a dispersant for dyes and pigments, a surfactant in detergents, and a chemical intermediate in research, valued for its thermal and chemical stability, polarity, anionic charge, and ability to modify solubility, dispersion, and flow properties in both industrial and laboratory applications, making it a critical functional additive in construction, chemical manufacturing, and materials science.
Industrially, Sulfonaphthalenes are widely employed as superplasticizers in concrete and cement formulations, where their anionic nature and molecular structure help disperse cement particles, reduce water usage, improve flowability, and enhance the mechanical properties of hardened concrete, making them essential for high-performance construction, precast concrete, and infrastructure projects.
Additionally, they are used as dispersants in dyes, pigments, and inks, where they provide stable, uniform suspensions of insoluble particles, prevent clumping or sedimentation, and maintain color consistency and brightness, as well as in detergents, textile processing, and industrial cleaning applications, where they function as wetting agents, emulsifiers, or solubilizers to improve cleaning efficiency, surface coverage, and chemical compatibility.
In research and chemical synthesis, Sulfonaphthalenes serve as building blocks or intermediates for more complex sulfonated aromatic compounds, ion-exchange resins, or water-soluble polymers, where their anionic sulfonate group enables strong interactions with cationic species, enhances solubility, and provides functional handles for further chemical modification, allowing chemists to design specialty materials, functional polymers, or charged molecular assemblies.
Sulfonaphthalene, also referred to as naphthalene-1-sulfonate, 1-naphthalenesulfonate, or alpha-naphthalenesulfonate, is a synthetic aromatic sulfonic acid derivative in which a sulfonic acid (-SO3H) group is covalently bonded to the naphthalene ring, giving the molecule strong hydrophilic and anionic characteristics that allow it to interact effectively with water, metal ions, and other charged species, making it highly valuable in industrial, chemical, and research applications.
Chemically, Sulfonaphthalenes are stable under moderate thermal, oxidative, and acidic conditions, and they can readily form salts with alkali metals, alkaline earth metals, or organic cations, which enhances their solubility, dispersibility, and functional versatility in aqueous and non-aqueous systems.
This property allows them to act as efficient dispersants, surfactants, complexing agents, and stabilizers, preventing aggregation or sedimentation of particles, stabilizing suspensions, and improving rheological and flow properties in both liquid and solid formulations.
In the construction industry, Sulfonaphthalenes are most commonly used as superplasticizers or water-reducing agents in concrete and cement mixtures, where their anionic and polar nature helps separate cement particles, reduce water content, improve workability, and increase the mechanical strength and durability of hardened concrete, making them critical for high-performance concrete, precast elements, large-scale infrastructure, and modern construction technologies.
Sulfonaphthalene is a versatile class of aromatic organic compounds formed by the sulfonation of naphthalene, resulting in the introduction of sulfonic acid groups (–SO₃H) onto the fused-ring naphthalene structure.
Depending on the degree and position of substitution, various derivatives such as mono-, di-, and poly-sulfonates can be obtained, each with distinctive solubility and performance characteristics.
In its typical commercial form, Sulfonaphthalene appears as a brownish to yellowish powder or flakes with a slight aromatic odor and shows excellent solubility in water, producing clear and stable solutions even at high concentrations.
One of its most important industrial applications is in the production of Sulfonaphthalene–formaldehyde condensates (NSF or SNF), which are high-performance dispersants widely used as superplasticizers in concrete and mortar formulations.
By dispersing cement particles and preventing agglomeration, these additives significantly improve the workability of fresh mixtures, reduce water demand, and enhance the final strength and durability of the hardened material.
This property has made Sulfonaphthalenes indispensable in large-scale construction, particularly in high-strength concrete, precast elements, and projects requiring long workability retention.
Beyond the construction sector, Sulfonaphthalenes function as dispersing agents and wetting agents in numerous industries.
In textile dyeing and printing, they aid in the even distribution and penetration of dyes into fibers, ensuring uniform coloration.
In leather processing, they improve the efficiency of tanning and dyeing processes.
They are also incorporated into detergents, agrochemicals, and pesticide formulations, where their strong surface activity enhances solubility, emulsification, and dispersion of active compounds.
Additionally, they find use in the formulation of gypsum board, ceramic slurries, and various pigment suspensions, where they improve fluidity and reduce viscosity.
Chemically, Sulfonaphthalenes are stable under normal storage and use conditions, but like most sulfonated aromatics, they may release toxic sulfur oxides (SOx) upon combustion or thermal decomposition.
Handling requires protective measures such as gloves, goggles, and proper ventilation to avoid skin or eye irritation and inhalation of dust.
They should be stored in a cool, dry, and well-ventilated area, away from strong oxidizing agents and direct moisture exposure, to preserve quality and prevent degradation.
From an environmental perspective, Sulfonaphthalenes are considered readily water-soluble and mobile, which allows them to function effectively in aqueous systems but also requires careful management to prevent contamination.
Modern environmental and safety regulations demand controlled use and disposal, with many industries adopting biodegradable or modified sulfonates to minimize ecological impact.
Overall, Sulfonaphthalenes represent a key group of chemical intermediates and functional additives with broad significance across construction, textiles, detergents, leather, agriculture, and specialty chemicals.
Their unique balance of dispersing ability, chemical stability, and cost-effectiveness has ensured their continued use for decades, while ongoing research focuses on improving biodegradability and performance in line with sustainable industrial practices.
Market Overview of Sulfonaphthalene:
The global Sulfonaphthalene market represents a significant segment of the specialty chemicals industry, primarily driven by its role as a dispersant and superplasticizer in the construction sector.
Sulfonaphthalene–formaldehyde condensates (NSF/SNF) are among the most widely used high-range water reducers in concrete admixtures, especially in regions with rapidly growing infrastructure such as Asia-Pacific, the Middle East, and parts of Africa.
This widespread adoption is attributed to their cost-effectiveness, strong dispersing power, and ability to enhance workability while reducing water consumption in cementitious systems.
Beyond construction, demand is supported by diverse end-use industries.
In the textile and leather sectors, Sulfonaphthalenes are used to improve dye dispersion, leveling, and penetration, ensuring uniform coloration.
In the agrochemical industry, they act as formulation aids in pesticides and herbicides, enhancing solubility and stability of active ingredients.
They are also increasingly utilized in detergents, pigments, ceramics, and gypsum board manufacturing, reflecting Sulfonaphthalene’s versatility across multiple industrial applications.
From a regional perspective, Asia-Pacific dominates global consumption, led by China and India, where large-scale infrastructure projects, urbanization, and high cement output fuel demand for superplasticizers.
Europe and North America show steady but slower growth, with a gradual shift toward newer polycarboxylate ether (PCE) superplasticizers due to their improved performance and environmental profile.
However, Sulfonaphthalenes maintain a competitive advantage in price-sensitive markets and applications requiring proven, reliable performance.
In terms of market dynamics, growth is influenced by the pace of construction projects, government infrastructure spending, and trends in sustainable chemistry.
While competition from newer dispersant technologies poses a challenge, ongoing innovations in modifying Sulfonaphthalene structures for better biodegradability and reduced environmental footprint are helping sustain market relevance.
Price fluctuations of raw materials such as naphthalene and formaldehyde, along with tightening regulatory standards for chemical safety and environmental compliance, also shape the market landscape.
Overall, the Sulfonaphthalene market is expected to remain stable with moderate growth in the coming years, driven by construction expansion in emerging economies, continuous applications in traditional industries, and efforts toward eco-friendly product development.
Uses of Sulfonaphthalene:
Sulfonaphthalene finds wide industrial use because the compound shows excellent dispersing power, surface activity, and stability.
The construction industry uses Sulfonaphthalene mainly in the form of Sulfonaphthalene–formaldehyde condensates, which act as high-range water-reducing admixtures in concrete and mortar.
These additives disperse cement particles, reduce water demand, and improve workability, strength, and durability, so engineers apply them in high-rise buildings, precast elements, bridges, dams, and tunnels.
The textile and leather industries also use Sulfonaphthalenes as dispersing and wetting agents, ensuring even dye penetration, preventing streaks, and increasing efficiency in tanning and finishing.
The agrochemical sector employs Sulfonaphthalene as a dispersant and emulsifier in pesticides, herbicides, and fungicides, where it enhances solubility, stability, and bioavailability, while farmers benefit from improved spraying efficiency.
The detergent industry incorporates Sulfonaphthalenes as surfactants in cleaning formulations, because these agents emulsify oils and soils, disperse dirt, and stabilize both powder and liquid products.
Manufacturers of pigments, ceramics, and gypsum boards rely on Sulfonaphthalene to reduce slurry viscosity, maintain stable dispersions, and improve surface finish.
The oil drilling industry uses Sulfonaphthalene to control rheology and stabilize solids in suspension, while producers of rubber, paper, and adhesives add it to improve mixing and processing efficiency.
Finally, the chemical industry sometimes employs Sulfonaphthalenes as intermediates in the synthesis of other specialty compounds.
Sulfonaphthalene may be used as an analytical reagent for iodine speciation analysis in urine using ion-pair reversed phase liquid chromatography coupled to inductively coupled plasma mass spectrometry (RP-LC-ICP-MS).
Sulfonaphthalene is extensively used as a superplasticizer in cement and concrete formulations, where its strong anionic sulfonate groups adsorb onto cement particles, dispersing them effectively, reducing the amount of water needed, improving workability and flow, and ultimately enhancing the compressive and tensile strength of the finished concrete, which is essential for modern infrastructure projects, high-rise buildings, precast concrete components, bridges, and other applications that demand durable, high-performance construction materials capable of withstanding environmental stressors.
In the pigment, dye, and ink industries, Sulfonaphthalenes function as dispersing agents that stabilize suspensions of finely divided solids, prevent flocculation, maintain color uniformity, improve brightness, and enhance compatibility with various solvents, making them crucial for producing high-quality paints, printing inks, textile dyes, and plastics with consistent color, reduced settling, and improved processing characteristics.
Sulfonaphthalene is primarily used as a highly effective superplasticizer in concrete and cement formulations, where its anionic sulfonate groups adsorb onto cement particles, promoting particle separation and dispersion, reducing the amount of water required, improving flowability, and increasing the mechanical strength and durability of the hardened concrete, which is critical for modern high-performance construction, precast elements, bridges, and infrastructure projects that demand uniform consistency, high compressive strength, and long-term stability under variable environmental conditions.
In addition to construction applications, Sulfonaphthalenes are widely employed as dispersing agents for pigments, dyes, and inks, where they stabilize finely divided particles in aqueous solutions or suspensions, prevent aggregation and sedimentation, enhance color uniformity and brightness, and maintain chemical and thermal stability during processing, making them essential for textiles, paints, printing inks, plastics, coatings, and other industrial colorant applications where consistent performance and appearance are required.
Sulfonaphthalenes also serve as surfactants, wetting agents, and emulsifiers in detergents, textile processing, and industrial cleaning formulations, where their hydrophilic sulfonate groups interact with water and their hydrophobic naphthalene rings interact with nonpolar substances, enabling enhanced solubilization of oils, greases, and other contaminants, improved surface coverage, and increased efficiency of cleaning, washing, or dyeing processes in both industrial and consumer applications.
In chemical synthesis and polymer science, Sulfonaphthalenes are used as building blocks, intermediates, or functional additives for the preparation of water-soluble polymers, ion-exchange resins, specialty chemical intermediates, and chelating agents, where their anionic charge and solubility in water facilitate interactions with metal ions, cationic species, or other functional groups, enabling the production of customized polymers, advanced materials, and functional additives with controlled dispersion, stability, and reactivity.
Additionally, Sulfonaphthalenes are applied in agrochemical formulations, environmental treatment processes, and industrial stabilizers, where their ability to disperse solid or liquid active ingredients, chelate metal ions, and maintain suspension stability contributes to enhanced effectiveness, shelf-life, and performance of pesticides, herbicides, water treatment chemicals, and other industrial products.
Sulfonaphthalene is a versatile chemical widely used as a superplasticizer in concrete, a dispersant for pigments and dyes, a surfactant and emulsifier in detergents and textile applications, and a functional intermediate in polymer and specialty chemical synthesis, valued for its strong anionic character, solubility in water, dispersing ability, and stability under industrial conditions, making it an indispensable additive for construction, chemical, textile, environmental, and materials science applications.
Sulfonaphthalene and its derivatives have a broad spectrum of industrial applications, because they show excellent dispersing power, surface activity, and chemical stability.
Sulfonaphthalene finds application mainly in the following sectors:
Construction Industry (Superplasticizers):
The construction industry uses Sulfonaphthalene in the production of Sulfonaphthalene–formaldehyde condensates (NSF or SNF), which act as high-range water-reducing admixtures in concrete and mortar.
These additives disperse cement particles and prevent flocculation, which improves the workability of fresh concrete.
They reduce water demand by up to 30% and enhance compressive and flexural strength.
They also increase durability and density of hardened structures.
Engineers apply them in high-rise buildings, precast elements, bridges, dams, and tunneling projects, especially where strength and flowability are critical.
Textile and Leather Industry:
The textile and leather industries use Sulfonaphthalenes as dispersing and wetting agents in dyeing, printing, and processing.
The agents ensure uniform distribution and penetration of dyes, prevent streaking, and improve leveling properties.
Leather manufacturers use them to improve the efficiency of tanning and finishing, which reduces processing time and chemical consumption.
Agrochemical Formulations:
The agrochemical sector employs Sulfonaphthalenes as dispersants and emulsifiers in pesticides, herbicides, and fungicides.
These compounds enhance solubility, stability, and bioavailability of active ingredients in aqueous solutions.
Farmers benefit from them because they prevent clumping and sedimentation, leading to more effective and uniform spraying.
Detergents and Cleaning Agents:
The detergent industry incorporates Sulfonaphthalenes as surfactants in both industrial and household cleaning formulations.
These agents aid in the emulsification of oils and greases, soil dispersion, and overall cleaning efficiency.
Formulators add them to ensure stability in powder detergents and liquid cleaning solutions, which guarantees consistency and long shelf life.
Pigments, Dyes, and Inorganic Materials:
Manufacturers of pigments and coatings use Sulfonaphthalenes as dispersing agents in pigment pastes, inks, and coatings, where they maintain stable suspensions and prevent agglomeration.
The ceramics industry applies them to reduce slurry viscosity, which improves fluidity and mold filling.
Gypsum board producers employ them to improve processing properties and surface finish.
Other Specialty Applications:
The oil drilling industry uses Sulfonaphthalenes as dispersants to control rheology and stabilize solids in suspension.
Rubber, paper, and adhesive manufacturers add them to formulations, which improves mixing, dispersion, and processing efficiency.
The chemical industry sometimes employs them as intermediates in the synthesis of other specialty chemicals.
Benefits of Sulfonaphthalene:
Sulfonaphthalene provides multiple benefits across industries because the compound combines strong dispersing ability with chemical stability and cost-effectiveness.
In the construction sector, Sulfonaphthalene–formaldehyde condensates allow engineers to reduce water demand in concrete while maintaining workability, which leads to stronger, denser, and more durable structures at lower material costs.
The textile and leather industries benefit from its ability to ensure uniform dye distribution, prevent streaking, and improve process efficiency, which results in higher-quality finished products.
The agrochemical sector gains from enhanced solubility and stability of pesticide and herbicide formulations, enabling farmers to achieve more consistent and effective field application.
The detergent and cleaning industry values Sulfonaphthalene's role as a surfactant that emulsifies oils and soils, disperses dirt, and extends product shelf life, which improves consumer satisfaction and brand reliability.
Pigment, ceramic, and gypsum board producers benefit from better slurry flow, reduced viscosity, and stable suspensions, which enhance product quality and processing efficiency.
Oil drilling operations utilize Sulfonaphthalene to control rheology and maintain suspension stability, which reduces downtime and increases operational reliability.
Finally, chemical manufacturers recognize Sulfonaphthalene's versatility as an intermediate, which enables the production of a range of specialty compounds.
Overall, industries choose Sulfonaphthalene because it offers performance, versatility, and affordability while remaining a proven and widely available solution.
Production of Sulfonaphthalene:
The production of Sulfonaphthalene begins with the sulfonation of naphthalene, where manufacturers treat naphthalene with concentrated sulfuric acid or oleum under controlled conditions to introduce sulfonic acid groups onto the aromatic ring.
The reaction typically yields naphthalene monosulfonic acids or disulfonic acids, depending on temperature, reaction time, and acid concentration.
Producers then neutralize the sulfonic acid groups with sodium hydroxide, yielding sodium Sulfonaphthalene, which is the most common commercial form.
In order to enhance dispersing power for industrial applications, many manufacturers further process the material by condensing naphthalene sulfonic acid with formaldehyde, producing Sulfonaphthalene–formaldehyde condensates (NSF or SNF).
These condensates are spray-dried or granulated to create powders or flakes that are easily dissolved in water.
Large-scale industrial production generally takes place in batch or continuous reactors equipped with temperature control and corrosion-resistant linings, because sulfonation is a highly exothermic process.
Producers pay close attention to reaction conditions to maximize yield and control product quality, as different isomers and degrees of sulfonation affect performance in downstream applications.
The final product is filtered, dried, and packaged for use in industries such as construction, textiles, detergents, and agrochemicals.
History of Sulfonaphthalene:
The history of Sulfonaphthalene dates back to the late 19th century, when chemists first discovered methods to sulfonate naphthalene using concentrated sulfuric acid, producing the earliest aromatic sulfonic acid derivatives.
Initially, these compounds found use as intermediates in the dye and textile industries, since they improved the solubility and dispersibility of synthetic dyes that were rapidly emerging at the time.
By the early 20th century, Sulfonaphthalenes gained wider application as dispersing agents in pigments, leather processing, and detergents, reflecting the growing industrial demand for surface-active chemicals.
A major milestone occurred in the mid-20th century, when researchers developed Sulfonaphthalene–formaldehyde condensates (SNF) as powerful water-reducing agents for concrete.
This innovation transformed the construction industry, enabling the production of high-strength, durable concrete with lower water content, which was crucial for infrastructure projects such as bridges, dams, and tunnels.
During the post–World War II reconstruction era, the demand for these superplasticizers surged, particularly in Europe and later in Asia.
By the late 20th century, Sulfonaphthalenes had become standard additives in global construction, while continuing to serve in traditional markets such as textiles, agrochemicals, and detergents.
In recent decades, competition has emerged from polycarboxylate ether (PCE) superplasticizers, which offer superior performance and environmental benefits, yet Sulfonaphthalenes remain widely used due to their cost-effectiveness, reliability, and established supply chains.
Today, their history reflects a long evolution from a dye auxiliary to a critical material in modern infrastructure development.
Handling and Storage of Sulfonaphthalene:
Handling:
Operators should handle Sulfonaphthalene in well-ventilated areas to minimize inhalation of dust.
Workers should avoid direct skin and eye contact by using protective gloves, safety goggles, and protective clothing.
Equipment should be properly grounded during transfer to prevent static discharge and dust ignition.
Storage:
Manufacturers recommend storing Sulfonaphthalene in tightly sealed containers, protected from moisture, direct sunlight, and excessive heat.
Storage areas should remain cool, dry, and well-ventilated, typically at 15–25 °C.
Containers should be kept away from strong oxidizing agents and incompatible chemicals.
Shelf Life:
When properly stored, Sulfonaphthalene retains stability for 2–3 years without significant loss of dispersing performance.
Stability and Reactivity of Sulfonaphthalene:
Chemical Stability:
Sulfonaphthalene is stable under normal handling and storage conditions.
Thermal Stability:
Sulfonaphthalene remains stable under moderate heat but may decompose at temperatures above 200–250 °C.
Reactivity:
Sulfonaphthalene is generally non-reactive under neutral conditions but may react vigorously with strong oxidizing agents.
Hazardous Decomposition Products:
Thermal decomposition may release sulfur oxides (SO₂, SO₃) and carbon oxides (CO, CO₂).
Incompatibilities:
Strong oxidizers such as peroxides, nitric acid, or chlorine compounds should be strictly avoided.
First Aid Measures of Sulfonaphthalene:
Inhalation:
If dust is inhaled, the affected person should be moved to fresh air.
Medical attention should be sought if irritation, coughing, or respiratory discomfort persists.
Skin Contact:
In case of skin contact, the exposed area should be washed thoroughly with soap and water.
Contaminated clothing should be removed and washed before reuse.
Eye Contact:
If Sulfonaphthalene enters the eyes, the eyes should be rinsed immediately with plenty of clean water for at least 15 minutes.
Medical advice should be obtained if irritation persists.
Ingestion:
If swallowed, the mouth should be rinsed with water and medical attention sought immediately.
Vomiting should not be induced unless directed by medical personnel.
Firefighting Measures of Sulfonaphthalene:
Suitable Extinguishing Media:
Dry chemical, foam, carbon dioxide (CO₂), or water spray may be used to extinguish fires involving Sulfonaphthalene.
Unsuitable Media:
Direct water jet should be avoided, as Sulfonaphthalene may spread spilled powder.
Special Hazards:
Combustion may produce irritating and toxic fumes, including sulfur oxides and carbon oxides.
Protective Equipment for Firefighters:
Firefighters should wear self-contained breathing apparatus (SCBA) and full protective clothing.
Accidental Release Measures of Sulfonaphthalene:
Personal Precautions:
Workers should wear protective gloves, goggles, and dust masks when handling spills.
Adequate ventilation should be ensured to minimize airborne dust.
Environmental Precautions:
Sulfonaphthalene should not be allowed to enter drains, surface water, or soil due to potential environmental contamination.
Containment and Cleaning:
Spilled material should be carefully swept or vacuumed (with explosion-proof or dust-rated equipment) into suitable labeled containers for disposal.
Surfaces should be cleaned with water and mild detergent to remove residues.
Exposure Controls / Personal Protective Equipment of Sulfonaphthalene:
Occupational Exposure Limits:
No specific exposure limits are established for Sulfonaphthalene, but dust exposure should be minimized according to general nuisance dust standards (e.g., 10 mg/m³ total dust, 3 mg/m³ respirable fraction).
Engineering Controls:
Local exhaust ventilation and general dilution ventilation should be applied in production, storage, and laboratory areas to control airborne dust.
Personal Protective Equipment:
Respiratory Protection:
Dust masks or respirators (EN 149 / NIOSH-approved) should be used if airborne concentrations exceed recommended levels.
Skin Protection:
Protective gloves (nitrile or neoprene) and chemical-resistant clothing should be worn.
Eye Protection:
Safety goggles or face shields should be used to prevent eye contact.
Hygiene Measures:
Workers should wash hands after handling and avoid eating, drinking, or smoking in work areas.
Identifiers of Sulfonaphthalene:
Chemical Formula: C₁₀H₇SO₃H
Molecular Weight: ~208.22 g/mol
CAS Numbers: 36290-04-7
EC Number: 201-635-8
InChI Key: OBVHKKOQESMRMD-UHFFFAOYSA-N
CAS Number: 532-02-5
EC Number: 208-523-8
Molecular Formula: C10H7NaO3S
Molecular Weight: 230.22
Properties of Sulfonaphthalene:
Appearance: Brownish to yellow powder or flakes
Odor: Mild aromatic
Solubility: Highly soluble in water, insoluble in nonpolar solvents
pH (1% sol.): ~7–9 (for sodium salts)
Density: ~1.6–1.8 g/cm³
Melting Point: ~160–165 °C (acid form, decomposes)
Stability: Stable under normal storage, decomposes at high temperature with SOx release
Functional Nature: Strong anionic surfactant, dispersant, and wetting agent
Melting point: 172-173 °C
Boiling point: 391.58 °C
Density: 0.4 g/cm3
Vapor pressure: 0 Pa at 25 °C
Storage temp.: Inert atmosphere, Room temperature
Water Solubility: Soluble in water
Form: Powder
Color: White to almost white
λmax: λ: 380 nm (Amax: 0.1); λ: 390 nm (Amax: 0.05); λ: 400 nm (Amax: 0.02); λ: 500 nm (Amax: 0.02)
Sensitive: Hygroscopic
BRN: 3659024
InChI: InChI=1S/C10H8O3S.Na/c11-14(12,13)10-6-5-8-3-1-2-4-9(8)7-10;/h1-7H,(H,11,12,13);/q;+1/p-1
InChIKey: YWPOLRBWRRKLMW-UHFFFAOYSA-M
SMILES: C12C=CC=CC1=CC=C(S([O-])(=O)=O)C=2.[Na+]
LogP: 0.01
Appearance: Brown to yellow powder, flakes, or granules (pure acids → white to light crystals)
Odor: Faint aromatic, weaker than naphthalene
Molecular Weight: ~208.2 g/mol (acid), ~230.2 g/mol (sodium salt), higher for condensates
Density: 1.6–1.8 g/cm³ (solid salts)
Melting Point: 160–165 °C (acid, decomposition), >300 °C (salts, decomposition)
Boiling Point: Not applicable (decomposes before boiling)
Solubility: Freely soluble in water; insoluble in nonpolar solvents
pH (1% solution): Neutral to slightly alkaline (7–9 for salts)
Ionization: Strongly acidic (acid form), fully dissociated (salts)
Hygroscopicity: Sodium salts absorb moisture from air
Stability: Stable at room temperature, sensitive to strong oxidizers
Thermal Decomposition: Releases sulfur oxides (SO₂, SO₃) on heating
Surface Activity: Strong dispersant, wetting agent, deflocculant
Biodegradability: Moderate; salts more biodegradable than condensates
Compatibility: Works with pigments, cement, agrochemicals; incompatible with cationic agents
