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| Naphthalene-2-sulfonic acid Basic information |
| 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) |
| 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 |
| 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 |
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