3-Hydroxynaphthalene-2,7-disulphonic acid
- Product Name
- 3-Hydroxynaphthalene-2,7-disulphonic acid
- CAS No.
- 148-75-4
- Chemical Name
- 3-Hydroxynaphthalene-2,7-disulphonic acid
- Synonyms
- 2-Naphthol-3,6-disulfonic acid;Aids018328;Aids-018328;Ponceau 4R Impurity 5;2-Naphtholdisodiumsulfonate;3-Hydroxynaphthalene-2,7-di;2-Naphthol-3,6-Disulphonic Acid;RSALT(2-NAPTHOL-3,6-DISULFONICACID;3-hydroxynaphthalene-2,7-disulfonicaci;2-Hydroxynaphthalene-3,6-disulfonicacid
- CBNumber
- CB2909992
- Molecular Formula
- C10H8O7S2
- Formula Weight
- 304.3
- MOL File
- 148-75-4.mol
3-Hydroxynaphthalene-2,7-disulphonic acid Property
- Boiling point:
- 415.13°C (rough estimate)
- Density
- 1.7421 (rough estimate)
- refractive index
- 1.6000 (estimate)
- pka
- -0.20±0.40(Predicted)
- EPA Substance Registry System
- 2,7-Naphthalenedisulfonic acid, 3-hydroxy- (148-75-4)
Safety
- TSCA
- TSCA listed
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H290May be corrosive to metals
H314Causes severe skin burns and eye damage
H335May cause respiratory irritation
- Precautionary statements
-
P234Keep only in original container.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P264Wash hands thoroughly after handling.
P264Wash skin thouroughly after handling.
P271Use only outdoors or in a well-ventilated area.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P301+P330+P331IF SWALLOWED: Rinse mouth. Do NOT induce vomiting.
P303+P361+P353IF ON SKIN (or hair): Remove/Take off Immediately all contaminated clothing. Rinse SKIN with water/shower.
P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P310Immediately call a POISON CENTER or doctor/physician.
P363Wash contaminated clothing before reuse.
P390Absorb spillage to prevent material damage.
P403+P233Store in a well-ventilated place. Keep container tightly closed.
P405Store locked up.
P406Store in corrosive resistant/… container with a resistant inner liner.
P501Dispose of contents/container to..…
N-Bromosuccinimide Price
- Product number
- 58983
- Product name
- 3-Hydroxy-2,7-naphthalenedisulfonicAcidSodiumSalt
- Packaging
- 10g
- Price
- $610
- Updated
- 2021/12/16
3-Hydroxynaphthalene-2,7-disulphonic acid Chemical Properties,Usage,Production
Chemical Properties
2-Hydroxynaphthalene-3,6-disulfonic acid [148-75-4]. (3-hydroxynaphthalene-2,7- disulfonic acid), R acid, C10H8O7S2, Mr 304.3, is readily soluble in water and ethanol. Although the sodium salt (R salt) is soluble in water, it can be precipitated by sodium chloride. The barium salt is sparingly soluble in cold water but is 8 % soluble in boiling water. Whereas sulfonation with 20 % oleum yields 2-hydroxynaphthalene3,6,8-trisulfonic acid, the reaction with Na2SO3– MnO2 gives 2-hydroxy-1,3,6-trisulfonic acid. Alkali fusion with sodium hydroxide gives 2,3-dihydroxynaphthalene-6-sulfonic acid and some 2,3-dihydroxynaphthalene. Amination (Bucherer) produces 2-aminonaphthalene-3,6- disulfonic acid. Diazo coupling and nitrosation take place in the 1-position.
Uses
3-Hydroxynaphthalene-2,7-disulphonic Acid can be used to prepare antimicrobial material.
Production Methods
2-Naphthol is heated in excess 98 % sulfuric acid to 60℃, and anhydrous sodium sulfate is added. The mixture is then heated for 24 h at 105℃, 12 h at 110 ℃, and 12 h at 120℃ before being diluted with more sulfuric acid and quenched in water. Sodium chloride is added at 60℃, and the mixture is cooled slowly to 30℃ with crystallization of the product as its sodium salt. The isolated yield is 68 %, and the product contains about 3 % of Schaeffer’s salt as the major impurity. Alternatively, R salt may be recovered as a byproduct from the G acid process (see 2-Hydroxynaphthalene-6,8-disulfonic acid). Further purification may be effected via the aniline salt.
3-Hydroxynaphthalene-2,7-disulphonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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