Naphthionic acid
1-Naphthylamine-4-sulfonic acid
CAS: 84-86-6
Molecular Formula: C10H9NO3S
Naphthionic acid - Names and Identifiers
| Name | 1-Naphthylamine-4-sulfonic acid |
| Synonyms | Naphthionic acid 1-Naphthylamine-4-sulfonic acid 4-aminonaphthalene-1-sulfonic acid 4-Amino-1-naphthalenesulfonic acid 4-Amino-1-naphthalene sulfonic acid 1-naphthalenesulfonic acid, 4-amino- |
| CAS | 84-86-6 |
| EINECS | 201-567-9 |
| InChI | InChI=1/C10H9NO3S/c11-9-5-6-10(15(12,13)14)8-4-2-1-3-7(8)9/h1-6H,11H2,(H,12,13,14) |
Naphthionic acid - Physico-chemical Properties
| Molecular Formula | C10H9NO3S |
| Molar Mass | 223.25 |
| Density | 1.502g/cm3 |
| Melting Point | 300℃ |
| Boling Point | 220°C (rough estimate) |
| Water Solubility | 309.9mg/L(20 ºC) |
| Solubility | Soluble in dilute hydroxide or carbonate solution, with blue fluorescence. Solubility in water: 1g product is soluble in 3.45L at 10 ℃, 3.22L at 20 ℃, 1.69L at 50 ℃, and 0.438L at 100 ℃. Very insoluble in ethanol and ether, almost insoluble in acetic acid and acetic anhydride |
| Appearance | White to gray powder |
| pKa | pK1: 2.81 (25°C) |
| Storage Condition | Store below +30°C. |
| Sensitive | `sensitive` to light and air. Decomposition without melting when burning |
| Refractive Index | 1.713 |
| MDL | MFCD00004027 |
| Physical and Chemical Properties | Chemical properties needle-like crystal, containing 1/2 molecules of crystal water. The relative density is 1.673(25/4 ℃) slightly soluble in water and has blue fluorescence. Sodium salt is easily soluble in water. |
| Use | Used as an intermediate for azo dyes, and also used for food coloring |
Naphthionic acid - Risk and Safety
| Hazard Symbols | C - Corrosive |
| Risk Codes | R22 - Harmful if swallowed R34 - Causes burns |
| Safety Description | S25 - Avoid contact with eyes. S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection. S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) |
| UN IDs | UN 2585 |
| WGK Germany | 3 |
| RTECS | QK1270000 |
| TSCA | Yes |
| HS Code | 29214500 |
| Hazard Class | 8 |
| Packing Group | III |
Naphthionic acid - Upstream Downstream Industry
Naphthionic acid - Nature
| solubility | Sparingly soluble in dichloromethane. Soluble in aqueous base. |
| Merck | 14,6403 |
| BRN | 1971299 |
| NIST chemical information | 4-Amino-1-naphthalene sulfonic acid(84-86-6) |
| EPA chemical information | 4-Amino-1-naphthalenesulfonic acid (84-86-6) |
Last Update：2024-04-10 22:29:15
Naphthionic acid - Uses and synthesis methods
use
1. dye intermediates. It is used to make acid red A, B, acid red 3R, direct red 4B, direct red jujube GB, direct red jujube B, etc., and to produce 1-naphthol -4-sulfonic acid and other intermediates.
2. Used as an azo dye intermediate, also used for food coloring
3. As an antidote to nitrite and iodine poisoning, it is also an intermediate of various azo dyes.
production method
Naphthylamine sulfonated to obtain 4-amino-1-naphthylsulfonic acid, which is neutralized to obtain sodium salt. The sulfonation reaction was carried out in the solvent trichlorobenzene, the reaction temperature was 185-190 ℃, the vacuum degree was controlled to 2.67-5.33kPa, the heat preservation reaction was 3.5h, and the end point was sampled and checked. After passing the test, cool down to 150 ℃, add alkaline water to neutralize, and control pH = 8-9. At 70-80 ℃, add carbolic acid and alkali sulfide to the neutralization solution, raise the temperature to 90-95 ℃, then stand and delaminate. The upper feed liquid is concentrated, cooled, crystallized, and centrifugally dried to be the finished product of sodium salt. 83% yield. The lower trichlorobenzene is washed and recycled.
category
toxic substances
toxicity classification
High toxicity
acute toxicity
abdominal cavity-mouse LD50: 300 mg/kg
flammability hazard characteristics
Flammable; combustion produces toxic nitrogen oxides and sulfur oxide smoke
storage and transportation features
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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View History
Naphthionic acid
Boc-L-羟脯氨酸
Methanetrisulphonic acid
magnesium bis[(2Z)-4-oxopent-2-en-2-olate] dihydrate
Z-L-丙氨酸-N-羧基-环内酸酐
3-醛基-6-甲基吡啶
(4-Chlorophenyl)[4-(1-Methylethoxy)phenyl]Methanone(Fenofibrate IMpurity)
叔丁氧羰基-色氨酸(5-PH)
4-二氨基苯基甲烷(H256)
3-氨基-5-溴苯甲酸
Boc-L-羟脯氨酸
Methanetrisulphonic acid
magnesium bis[(2Z)-4-oxopent-2-en-2-olate] dihydrate
Z-L-丙氨酸-N-羧基-环内酸酐
3-醛基-6-甲基吡啶
(4-Chlorophenyl)[4-(1-Methylethoxy)phenyl]Methanone(Fenofibrate IMpurity)
叔丁氧羰基-色氨酸(5-PH)
4-二氨基苯基甲烷(H256)
3-氨基-5-溴苯甲酸
Raw Materials for Naphthionic acid
Downstream Products for Naphthionic acid
Congo Red
Sunset Yellow FCF
2,3-Dichloro-1,4-naphthoquinone
Direct Yellow 106
Sodium 4-amino-1-naphthalenesulfonate
DIRECT RED 26
2,7-Naphthalenedisulfonic acid, 4-amino-5-[[(4-methylphenyl)sulfonyl]oxy]-3-[(4-sulfo-1-naphthalenyl)azo]-, trisodium salt
BRILLIANT PURPURIN R
Sunset Yellow FCF
2,3-Dichloro-1,4-naphthoquinone
Direct Yellow 106
Sodium 4-amino-1-naphthalenesulfonate
DIRECT RED 26
2,7-Naphthalenedisulfonic acid, 4-amino-5-[[(4-methylphenyl)sulfonyl]oxy]-3-[(4-sulfo-1-naphthalenyl)azo]-, trisodium salt
BRILLIANT PURPURIN R