2-Naphthalenesulfonic acid
Synonyms
beta-Naphthalenesulfonic acid;
Category
Anionic Surfactant
> Sulfonate
>> Aryl Sulfonate
>>> Naphthyl Sulfonate
>>>> Naphthalene Sulfonate
Chemical Numbering System
CAS: 120-18-3
EINECS: 204-375-3
Molecular Formula & Molecular Weight
Molecular Formula: C10H8O3S
Molecular Weight: 208.23
Structure
Properties
Appearance (1), solid.
Solubility soluble in water.
Stability stable.
Risk Solid form: flammable material; irritation, moderate irritation to skin, eye, respiratory. Harmful products of combustion are CO, CO2 and so on. Contact with strong oxidants, can cause to burn.
GHS label: 
Animal Toxicity
Table 1 Animal toxicity values
|
rat oral LD50 |
4440mg/kg[1] |
Ecology may be hazardous to environment. Water body should be given special attention.
Biodegradability biodegradable.
Characteristics excellent wetting, permeating, dispersing, emulsifying, hydrotropic abilities.
Synthesis
Naphthalene and concentrated sulfuric acid react through the sulfonation reaction, finally obtain product.
Quality Standards & Test Methods
1, Physical and chemical indexes
|
Item |
Physical and chemical indexes |
|
Solid |
|
|
Actives, %, ≥ |
95.0 |
Test Methods
(1), Actives
GB/T 5173 Surface active agents and detergents -- Determination of anionic-active matter by direct two-phase titration procedure
ISO 2271 Surface active agents -- Detergents -- Determination of anionic-active matter by manual or mechanical direct two-phase titration procedure
2, Hazardous substances indexes
|
Item |
Hazardous substances indexes |
|
Solid |
|
|
Heavy metals (as Pb), mg/kg, ≤ |
20 |
|
As, mg/kg, ≤ |
3 |
Test Methods
(1), Heavy metals (as Pb)
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30799 The test method of food detergents -- Determination of heavy metals
(2), As
Safety and Technical Standards for Cosmetics (2015 Edition)
GB/T 30797 The test method of food detergents -- Determination of total arsenic
3, Further explanation
(a), On physical and chemical indexes: firstly, shall be indicated carbon atom distribution; secondly, shall be indicated average molecular weight.
Major Uses
1, Typical applications
Use as penetrating agent, wetting agent.
Use as dispersing agent, emulsifying agent.
Use as hydrotrope.
2, Organic synthesis
Use as intermediate in organic synthesis.
Manufacturers
References
[1]: ChemIDplus. 120-18-3, 2-Naphthalenesulfonic acid
Update: 20170525(1);