| Identification | More | [Name]
Naphthalene-2-sulfonic acid | [CAS]
120-18-3 | [Synonyms]
2-NAPHTHALENESULFONIC ACID
BETA-NAPHTHALENESULFONIC ACID
BETA NAPTHALENE SULPHONATE
Naphthalene-2-sulfonic acid
NAPHTHALENE-2-SULPHONIC ACID
β-Naphthalene sulfonic acid
2-Naphthalenesulfonicacid,tri
beta-naphthalenesulfonic
beta-naphthylsulfonicacid
kyselina2-naftalensulfonova
2-NAPHTHALENESULFONIC ACID, TECH., 70%
2-NAPHTHALENESULFONIC ACID MONOHYDRATE(BETA-) 97+%
Naphthalene-2-sulfonic acid hydrate, tech., 70%
NAPHTHALENE-2-SULFONICACID,MONOHYDRATE(BETA-)
BETA-NAPHTHALENE-SULPHONICACID
2-NAPHTHALENESULFONIC ACID 98% HPLC
NAPHTHALENE-2-SULPHONIC ACID (FREE ACID) extrapure
2-Sulfonaphthalene
Dirinal NSK | [EINECS(EC#)]
204-375-3 | [Molecular Formula]
C10H8O3S | [MDL Number]
MFCD00004089 | [Molecular Weight]
208.23 | [MOL File]
120-18-3.mol |
| Chemical Properties | Back Directory | [Appearance]
Nondeliquescent, white plates.Soluble in water, alcohol, and ether. Combustible. | [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) | [Water Solubility ]
Soluble in water. | [Sensitive ]
Hygroscopic | [Merck ]
6377 | [Uses]
Starting point in the manufacture of β-naphthol,
β-naphtholsulfonic acid, β-naphthylaminesulfonic
acid, etc. | [CAS DataBase Reference]
120-18-3(CAS DataBase Reference) | [EPA Substance Registry System]
120-18-3(EPA Substance) |
| Safety Data | Back Directory | [Hazard Codes ]
C,F | [Risk Statements ]
R35:Causes severe burns.
R34:Causes burns.
R11:Highly Flammable. | [Safety Statements ]
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S16:Keep away from sources of ignition-No smoking . | [RIDADR ]
UN 2583 8/PG 2
| [WGK Germany ]
1
| [RTECS ]
QK1225000
| [Hazard Note ]
Corrosive | [TSCA ]
Yes | [HazardClass ]
8 | [PackingGroup ]
III |
| Hazard Information | Back Directory | [Chemical Properties]
Nondeliquescent, white plates.Soluble in water, alcohol, and ether. Combustible. | [Definition]
ChEBI: A naphthalenesulfonic acid in which the sulfo group is linked to position 2 of the naphthalene ring. | [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. | [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]
Nonflammable | [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.] |
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