2-Naphthylamine-5,7-disulfonic acid
- CAS NO.：118-33-2
- Empirical Formula: C10H9NO6S2
- Molecular Weight: 303.31
- MDL number: MFCD00021513
- EINECS: 204-246-1
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-12 09:16:51
What is 2-Naphthylamine-5,7-disulfonic acid?
Chemical properties
White glossy long prismatic needle-like crystals, the crystals precipitated from water contain 5 molecules of crystal water. The solubility in water at 20°C is 23%. Its monosodium salt and monopotassium salt are commonly used in industry, both of which are soluble in water, and the salt solution has green fluorescence.
The Uses of 2-Naphthylamine-5,7-disulfonic acid
2-Naphthylamine-5,7-disulfonic acid is an intermediate for the preparation of J acid, bis-J acid, phenyl J acid and scarlet acid.
Hazard
Skin - Rabbit 2 mg/24h severe; Eye - Rabbit 0.75 mg/24h severe
Flammability and Explosibility
Not classified
Synthesis
2-Naphthylamine-5,7-disulfonic acid can be obtained by hydrolysis of 2-naphthylamine-1,5,7-trisulfonic acid. Add sulfuric acid, sodium sulfate and 2-naphthylamine-1,5,7-trisulfonic acid into water, keep warm at 110-120°C for 4 hours, cool and filter, and wash in sodium sulfate solution to obtain the product.
Properties of 2-Naphthylamine-5,7-disulfonic acid
| Boiling point: | 568.34℃[at 101 325 Pa] |
| Density | 1.769±0.06 g/cm3(Predicted) |
| vapor pressure | 0Pa at 25℃ |
| pka | -0.91±0.40(Predicted) |
| Water Solubility | 229g/L at 15℃ |
| CAS DataBase Reference | 118-33-2(CAS DataBase Reference) |
| EPA Substance Registry System | 1,3-Naphthalenedisulfonic acid, 6-amino- (118-33-2) |
Safety information for 2-Naphthylamine-5,7-disulfonic acid
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation |
| Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P280:Wear protective gloves/protective clothing/eye protection/face protection. P301+P312:IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell. P302+P352:IF ON SKIN: wash with plenty of soap and water. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for 2-Naphthylamine-5,7-disulfonic acid
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