2-Amino-4,8-naphthalenedisulfonic acid
- CAS NO.：131-27-1
- Empirical Formula: C10H9NO6S2
- Molecular Weight: 303.31
- MDL number: MFCD00035722
- EINECS: 205-020-5
- SAFETY DATA SHEET (SDS)
- Update Date: 2026-05-28 03:57:55
What is 2-Amino-4,8-naphthalenedisulfonic acid?
Chemical properties
2-Aminonaphthalene-4,8-disulfonic acid [131-27-1]. (3-aminonaphthalene-1,5-disulfonic acid), Cassella acid, C acid, C10H9NO6S2, Mr 303.32, and its salts are readily soluble in water. Reduction with sodium amalgam desulfonates 2-Aminonaphthalene-4,8-disulfonic acid to give 2-aminonaphthalene-8-sulfonic acid, whereas boiling with dilute sulfuric acid results in desulfonation and hydrolysis to give 2- hydroxynaphthalene-4-sulfonic acid. Alkali fusion (KOH, 215℃) produces 2-amino-4-hydroxynaphthalene-8-sulfonic acid.
The Uses of 2-Amino-4,8-naphthalenedisulfonic acid
2-Amino-4,8-naphthalenedisulfonic Acid is used in green preparation method of direct blended blue D 3GL.
The Uses of 2-Amino-4,8-naphthalenedisulfonic acid
Cassella acid is an important diazo component for yellow direct and reactive dyes.
Production Methods
The iron(II) salt of 3-nitronaphthalene-1,5-disulfonic acid (nitro-Armstrong acid) is reduced with iron in dilute acid. A claimed improvement involves isolation of nitro-Armstrong acid from the nitration products of naphthalene-1,5-disulfonic acid as the crystalline magnesium salt prior to catalytic reduction to C acid.
Properties of 2-Amino-4,8-naphthalenedisulfonic acid
| Boiling point: | 205.8°C (rough estimate) |
| Density | 1.6329 (rough estimate) |
| refractive index | 1.7330 (estimate) |
| storage temp. | 2-8°C |
| pka | -1.16±0.40(Predicted) |
| CAS DataBase Reference | 131-27-1(CAS DataBase Reference) |
| EPA Substance Registry System | 1,5-Naphthalenedisulfonic acid, 3-amino- (131-27-1) |
Safety information for 2-Amino-4,8-naphthalenedisulfonic 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. P264:Wash hands thoroughly after handling. P264:Wash skin thouroughly after handling. P270:Do not eat, drink or smoke when using this product. P271:Use only outdoors or in a well-ventilated area. P280:Wear protective gloves/protective clothing/eye protection/face protection. P330:Rinse mouth. P362:Take off contaminated clothing and wash before reuse. 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. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P332+P313:IF SKIN irritation occurs: Get medical advice/attention. P337+P313:IF eye irritation persists: Get medical advice/attention. P405:Store locked up. P403+P233:Store in a well-ventilated place. Keep container tightly closed. P501:Dispose of contents/container to..… |
Computed Descriptors for 2-Amino-4,8-naphthalenedisulfonic acid
2-Amino-4,8-naphthalenedisulfonic acid manufacturer
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product: 3-Amino-1,5-naphthalenedisulfonic acid
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