120-18-3

Name	Naphthalene-2-sulfonic acid
CAS	120-18-3
EINECS(EC#)	204-375-3
Molecular Formula	C10H8O3S
MDL Number	MFCD00004089
Molecular Weight	208.23
MOL File	120-18-3.mol

Chemical Properties

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. less more
CAS DataBase Reference	120-18-3(CAS DataBase Reference)
EPA Substance Registry System	120-18-3(EPA Substance)

Safety Data

Hazard Codes	C,F
Risk Statements	R35:Causes severe burns. R34:Causes burns. R11:Highly Flammable. less more
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 . less more
RIDADR	UN 2583 8/PG 2
WGK Germany	1
RTECS	QK1225000
Hazard Note	Corrosive
TSCA	Yes
HazardClass	8
PackingGroup	III

Raw materials And Preparation Products

Hazard Information

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.]

Material Safety Data Sheet(MSDS)

Spectrum Detail

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