Naphthalene-2-sulfonic acid
- CAS No.
- 120-18-3
- Chemical Name:
- Naphthalene-2-sulfonic acid
- Synonyms
- 2-NAPHTHALENESULFONIC ACID;NAPTHELENE SULPHONIC ACID;NAPHTHALENE-2-SULPHONIC ACID;Dirinal NSK;2-Sulfonaphthalene;2-Naphthalenesulfoni;β-Naphthalenesulfonic;beta-naphthalenesulfonic;beta-naphthylsulfonicacid;2-NAPHTHALENESULFONIC ACI
- CBNumber:
- CB8118079
- Molecular Formula:
- C10H8O3S
- Molecular Weight:
- 208.23
- MDL Number:
- MFCD00004089
- MOL File:
- 120-18-3.mol
- MSDS File:
- SDS
- TDS File:
- TDS
| Melting point | 124 °C |
|---|---|
| Boiling point | 317.43°C (rough estimate) |
| Density | 1.44 g/cm |
| vapor pressure | 2.33Pa at 20℃ |
| refractive index | 1.4998 (estimate) |
| storage temp. | Inert atmosphere,Room Temperature |
| solubility | water: freely soluble(lit.) |
| pka | 0.27±0.10(Predicted) |
| form | solid |
| color | White |
| Water Solubility | Soluble in water. |
| Sensitive | Hygroscopic |
| Merck | 6377 |
| InChI | 1S/C10H8O3S/c11-14(12,13)10-6-5-8-3-1-2-4-9(8)7-10/h1-7H,(H,11,12,13) |
| InChIKey | KVBGVZZKJNLNJU-UHFFFAOYSA-N |
| SMILES | OS(=O)(=O)c1ccc2ccccc2c1 |
| LogP | -0.944 at 23℃ |
| CAS DataBase Reference | 120-18-3(CAS DataBase Reference) |
| EWG's Food Scores | 1 |
| FDA UNII | O9S4K2S25E |
| EPA Substance Registry System | 2-Naphthalenesulfonic acid (120-18-3) |
| UNSPSC Code | 12352100 |
| NACRES | NA.22 |
SAFETY
Risk and Safety Statements
| Symbol(GHS) |  GHS05 |
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Signal word | Danger | |||||||||
| Hazard statements | H290-H314 | |||||||||
| Precautionary statements | P260-P280-P301+P330+P331-P303+P361+P353-P305+P351+P338+P310 | |||||||||
| Hazard Codes | C,F | |||||||||
| Risk Statements | 35-34-11 | |||||||||
| Safety Statements | 26-36/37/39-45-16 | |||||||||
| RIDADR | UN 2583 8/PG 2 | |||||||||
| WGK Germany | 1 | |||||||||
| RTECS | QK1225000 | |||||||||
| Hazard Note | Corrosive | |||||||||
| TSCA | TSCA listed | |||||||||
| HazardClass | 8 | |||||||||
| PackingGroup | III | |||||||||
| HS Code | 2904100090 | |||||||||
| Storage Class | 8A - Combustible corrosive hazardous materials | |||||||||
| Hazard Classifications | Eye Dam. 1 Met. Corr. 1 Skin Corr. 1A |
|||||||||
| REACH Registrations | Active | |||||||||
| Limited Quantities | 1 Kg (2.2 lbs) (solid) | |||||||||
| Excepted Quantities | Max Inner Pack (30g or 30ml) and Max Outer Pack (500g or 500ml) | |||||||||
| NFPA 704 |
|
Naphthalene-2-sulfonic acid price More Price(30)
| Manufacturer | Product number | Product description | CAS number | Packaging | Price | Updated | Buy |
|---|---|---|---|---|---|---|---|
| Sigma-Aldrich | 249548 | 2-Naphthalenesulfonic acid technical grade, 70% | 120-18-3 | 5g | $28.5 | 2026-04-30 | Buy |
| Sigma-Aldrich | 249548 | 2-Naphthalenesulfonic acid technical grade, 70% | 120-18-3 | 100g | $132 | 2026-04-30 | Buy |
| TRC | TRC-N378503-5G | Naphthalene-2-sulfonic Acid Hydrate | 120-18-3 | 5g | $109 | 2026-06-03 | Buy |
| TRC | TRC-N378503-1G | Naphthalene-2-sulfonic Acid Hydrate | 120-18-3 | 1g | $102 | 2026-06-03 | Buy |
| TRC | TRC-N378503-10G | Naphthalene-2-sulfonic Acid Hydrate | 120-18-3 | 10g | $123 | 2026-06-03 | Buy |
Naphthalene-2-sulfonic acid Chemical Properties, Uses, Production
Chemical Properties
Nondeliquescent, white plates.Soluble in water, alcohol, and ether. Combustible.
Uses
Naphthalene-2-sulfonic acid is used in making direct dyes, reactive des and employed as dye and agrochemical intermediates.
Uses
Starting point in the manufacture of β-naphthol, β-naphtholsulfonic acid, β-naphthylaminesulfonic acid, etc.
Preparation
Naphthalene-2-sulfonic acid is prepared by sulfonation of naphthalene.
Step: With naphthalene as raw material, 98% sulfuric acid is used as sulfonating agent, and it is obtained by sulfonation at 160-166 ℃. During the sulfonation process, a small amount of α-naphthalenesulfonic acid by-product is generated. By heating, the unstable α-naphthalenesulfonic acid can be hydrolyzed at 140-150 °C to remove the sulfonic acid group, and become naphthalene and sulfuric acid. Naphthalene can be blown out. During the hydrolysis of naphthalene, a small amount of lye should be added to neutralize part of the sulfuric acid. It also acts with naphthalenesulfonic acid to form β-naphthalenesulfonic acid sodium salt crystals, which can be filtered to obtain the finished product of Naphthalene-2-sulfonic acid.
Definition
ChEBI: Naphthalene-2-sulfonic acid is a naphthalenesulfonic acid in which the sulfo group is linked to position 2 of the naphthalene ring. It has a role as an environmental contaminant and a xenobiotic.
General Description
The fluorescence of 2-naphthalenesulfonic acid (NSA) is effectively quenched by colloidal silver via photoinduced interfacial electron transfer from the excited singlet of NSA to silver. Adsorption behavior of NSA on a conventional macroporous resin Amberlite XAD4 and hypercrosslinked resins NDA101 and NDA100 has been investigated.
Flammability and Explosibility
Non flammable
Purification Methods
Crystallise the acid from conc HCl. The S-benzylisothiuronium salt has m 192o (from aqueous EtOH). [Berger Acta Chem Scand 8 432 1954, Beilstein 11 H 171, 11 IV 527.]
Naphthalene-2-sulfonic acid Preparation Products And Raw materials
Raw materials
1of2
Preparation Products
1of3
| Supplier | Tel | Country | ProdList | Advantage | |
|---|---|---|---|---|---|
| Shanghai mayao chemical technology co., ltd. | 021-51068321 | my@mychems.com | China | 59 | 58 |
| Shandong Lifan Chemical Co. LTD | 17661223836 | 896889070@qq.com | China | 97 | 58 |
| Hubei Paijian Biotechnology Co., Ltd | 18164202469 18163347313 | 1205135340@qq.com | China | 116 | 58 |
| J & K SCIENTIFIC LTD. | 18210857532 18210857532 | jkinfo@jkchemical.com | China | 96815 | 76 |
| future industrial shanghai co., ltd | 400-0066400 13621662912 | sales@jonln.com | China | 1989 | 65 |
| Alfa Aesar | 400-6106006 | saleschina@alfa-asia.com | China | 30103 | 84 |
| ShangHai DEMO Chemical Co.,Ltd | 400-021-7337 2355568890 | sales@demochem.com | China | 2569 | 57 |
| Beijing HwrkChemical Technology Co., Ltd | 89508211 18501085097 | sales.bj@hwrkchemical.com | China | 9407 | 55 |
| Capot Chemical Co., Ltd | +86 (0) 571 85 58 67 18 | China | 18187 | 66 | |
| Beijing Ouhe Technology Co., Ltd | 13552068683 13522913783 | 2355560935@qq.com | China | 11777 | 60 |
View Latest Price from Naphthalene-2-sulfonic acid manufacturers
| Image | Update time | Product | Price | Min. Order | Purity | Supply Ability | Manufacturer | |
|---|---|---|---|---|---|---|---|---|
 |
2026-09-02 | Naphthalene-2-sulfonic acid
120-18-3
|
$1.00-100.00 | 1KG | 99% | Henan Fengda Chemical Co., Ltd | ||
 |
2026-03-20 | Naphthalene-2-sulfonic acid
120-18-3
|
$9.90 | 1KG | 99% | 5tons | Hebei Chuanghai Biotechnology Co., Ltd | |
 |
2025-06-20 | Naphthalene-2-sulfonic acid
120-18-3
|
$10.00-20.00 | 25kg | 99% | 100T | Hebei Yanxi Chemical Co., Ltd. |
-
- Naphthalene-2-sulfonic acid
120-18-3
- $1.00-100.00
- 99%
- Henan Fengda Chemical Co., Ltd
-
- Naphthalene-2-sulfonic acid
120-18-3
- $9.90
- 99%
- Hebei Chuanghai Biotechnology Co., Ltd
-
- Naphthalene-2-sulfonic acid
120-18-3
- $10.00-20.00
- 99%
- Hebei Yanxi Chemical Co., Ltd.
