Naphthalene-2-sulfonic acid

CAS No.：120-18-3

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Naphthalene-2-sulfonic acid Basic information

Product Name:	Naphthalene-2-sulfonic acid
Synonyms:	2-Naphthalenesulfonicacid,tri;BETA NAPTHALENE SULPHONATE;BETA-NAPHTHALENESULFONIC ACID;2-Naphthalenesulfoni;2-Naphthalenesulfonic Acid 2-Sulfonaphthalene;Dirinal NSK;2-Naphthalenesulfonic Acid (β-Naphthalenesulfonic acid)
CAS:	120-18-3
MF:	C10H8O3S
MW:	208.23
EINECS:	204-375-3
Product Categories:	Intermediates of Dyes and Pigments;Imidazoles;Organic Building Blocks;Sulfonic/Sulfinic Acids;Sulfur Compounds
Mol File:	120-18-3.mol

Naphthalene-2-sulfonic acid Chemical Properties

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
LogP	-0.944 at 23℃
CAS DataBase Reference	120-18-3(CAS DataBase Reference)
EPA Substance Registry System	2-Naphthalenesulfonic acid (120-18-3)

Safety Information

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	Yes
HazardClass	8
PackingGroup	III
HS Code	2904100090

MSDS Information

Provider	Language
2-Naphthalenesulfonic acid	English
SigmaAldrich	English

Naphthalene-2-sulfonic acid Usage And Synthesis

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	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.]

Naphthalene-2-sulfonic acid Preparation Products And Raw materials

Raw materials	1-Naphthalenesulfonic acid-->Sodium 2-naphthalenesulfonate-->1-Naphthalenesulfinic acid-->DI-2-NAPHTHYLDISULPHIDE-->2-Naphthalenesulfonyl chloride-->2-Naphthalenethiol-->1,6-Naphthalenedisulfonic acid
Preparation Products	1-Naphthol-->2-Naphthol-->L-Leucine-->1-Aminonaphthalene-6-sulfonic acid-->Ambroxane-->1-Naphthalenesulfonic acid-->Sodium 2-naphthalenesulfonate-->disodium methylenebisnaphthalenesulphonate-->Acid Red 154-->disodium 3,3'-[cyclohexylidenebis[(2-methoxy-4,1-phenylene)azo]]bis(4,6-dihydroxynaphthalene-2-sulphonate)-->dispersant FDN-90-->1,8-DICHLORONAPHTHALENE

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