119-79-9
5-amino-2-naphthalenesulfonic acid
CAS: 119-79-9;51548-48-2
Molecular Formula: C10H9NO3S
119-79-9 - Names and Identifiers
119-79-9 - Physico-chemical Properties
| Molecular Formula | C10H9NO3S |
| Molar Mass | 223.25 |
| Density | 1.3588 (rough estimate) |
| Melting Point | >300°C |
| Water Solubility | 1g/L(16 ºC) |
| Solubility | soluble100mg/mL, clear, brown (1N NH4OH) |
| Vapor Presure | 0Pa at 25℃ |
| Appearance | Crystallization |
| Color | Purple |
| Merck | 14,2350 |
| BRN | 1819887 |
| pKa | pK1: 3.80 (25°C) |
| Storage Condition | Refrigerator |
| Refractive Index | 1.6500 (estimate) |
| MDL | MFCD00004030 |
| Physical and Chemical Properties | Character needle-like crystal. solubility insoluble in ethanol and ether. Soluble in ammonia. |
| Use | For the preparation of azo dyes and sulfur dyes, such as direct sun-resistant blue BGL, sulfide blue CV, etc |
119-79-9 - Risk and Safety
| Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
| Safety Description | S26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S24/25 - Avoid contact with skin and eyes. |
| UN IDs | 1759 |
| WGK Germany | 1 |
| RTECS | QK1285000 |
| TSCA | Yes |
| HS Code | 29309090 |
| Hazard Class | 8 |
| Packing Group | III |
119-79-9 - Upstream Downstream Industry
| Raw Materials | Sulfuric acid Naphthalene Iron Nitric acid |
119-79-9 - Nature
Open Data Verified Data
colorless needle-like crystals. Slightly soluble in water. 1, the melting point of 6 amino Naphthalene sulfonic acid is greater than 330.
Last Update：2024-01-02 23:10:35
119-79-9 - Preparation Method
Open Data Verified Data
refined naphthalene is sulfonated to obtain 2-naphthalenesulfonic acid, and nitrated to form 1-nitro -6(7)-naphthalenesulfonic acid, which is then reduced to obtain the finished product. Can use 1,6 and 1,7 amino Naphthalene sulfonic acid magnesium salt in a certain temperature solubility difference to be separated.
Last Update：2022-01-01 10:56:23
119-79-9 - Application
Open Data Verified Data
This product is mainly used for the manufacture of direct light blue B2R, RGL, BGL, direct light ash LBN, direct light brown RTL and direct black FF and other dyes. It is also used in the manufacture of azo dyes such as sulfur blue CV, and processing into neutral dye intermediates.
Last Update：2025-08-19 16:24:40
119-79-9 - Safety
Open Data Verified Data
- toxic, rat oral LD50 14mg/kg. Production equipment should be closed, the operator should wear protective equipment.
- the container is packed in a plastic bag lined with a barrel or an iron drum. 50kg per barrel. Store in a cool, dry, ventilated place, avoid sun exposure, prevent moisture, heat. According to the provisions of toxic substances storage and transportation.
Last Update：2022-01-01 10:56:23
119-79-9 - Reference Information
| dissociation constant | 0 at 39 ℃ |
| NIST chemical information | Information provided by: webbook.nist.gov (external link) |
| EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
| Introduction | 5-aminonaphthalene-2-sulfonic acid is a carboxylic acid derivative and can be used as an organic intermediate. |
| use | used to prepare azo dyes and sulfide dyes, such as direct sun-resistant blue BGL, sulfide blue CV, etc. this product is an intermediate of azo dyes and sulfide dyes. |
| Production method | Fine naphthalene is sulfonated to obtain 2-naphthalene sulfonic acid, which is nitrated to form 1-nitro-6-naphthalene sulfonic acid and 1-Nitro-7-naphthalene sulfonic acid mixture. The mixed nitronaphthalene sulfonic acid is used in magnesium carbonate to form magnesium salt, and then reduced with iron powder to obtain the mixed magnesium aminonaphthalene sulfonic acid using the difference in solubility of the two isomers of magnesium salt at a certain temperature Separation, after separation, acid analysis to obtain 1, 6-klevic acid and 1, 7-klevic acid respectively. |
| category | toxic substances |
| toxicity classification | low toxicity |
| acute toxicity | oral-rat LD50: 14200 mg/kg |
| stimulation data | eyes-rabbit 500 mg/24 hours mild |
| flammability hazard characteristics | combustible; combustion produces toxic nitrogen oxides and sulfur oxide smoke |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | dry powder, foam, sand, carbon dioxide, mist water |
Last Update：2024-04-10 22:29:15
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Raw Materials for 119-79-9