Tobias acid
Tobias acid
CAS: 81-16-3
Molecular Formula: C10H9NO3S
Tobias acid - Names and Identifiers
| Name | Tobias acid |
| Synonyms | Tobias acid TOBIAS ACID SUPER J ACID 2-aminonaphthalene-1-sulfonate 2 NAPHTHYLAMINE SULPHONIC ACID 2-NAPHTHYLAMINE-1-SULFONIC ACID 2-Naphthylamine-1-sulfonic acid 2-AMINO-1-NAPHTHALENESULFONIC ACID 2-AMINONAPHTHALENE-1-SULFONIC ACID 1-Naphthalenesulfonicacid,2-amino- 2-Amino-1-naphthalenesulfonic acid 2-aminonaphthalene-1-sulphonic acid 1-Naphthalenesulfonic acid, 2-amino- |
| CAS | 81-16-3 |
| EINECS | 201-331-5 |
| InChI | InChI=1/C10H9NO3S/c11-9-6-5-7-3-1-2-4-8(7)10(9)15(12,13)14/h1-6H,11H2,(H,12,13,14)/p-1 |
Tobias acid - Physico-chemical Properties
| Molecular Formula | C10H9NO3S |
| Molar Mass | 223.25 |
| Density | 1.3588 (rough estimate) |
| Melting Point | 180 °C |
| Boling Point | 220°C (rough estimate) |
| Water Solubility | 4.083g/L(20 ºC) |
| Solubility | Soluble in hot water, slightly soluble in cold water, very slightly soluble in alcohol and ether. |
| Appearance | White crystal |
| Color | White to Off-White |
| Merck | 14,6406 |
| BRN | 613084 |
| pKa | pK1: 2.35 (25°C) |
| Storage Condition | -20°C Freezer, Under inert atmosphere |
| Refractive Index | 1.5250 (estimate) |
| MDL | MFCD00003988 |
| Physical and Chemical Properties | Character: White needle-like crystal. solubility slightly soluble in cold water, soluble in hot water, very slightly soluble in ethanol and ether. |
| Use | Azo dyes and azo pigment intermediates, used in the manufacture of J acid and r acid, phenol AS-SW, reactive red K-1613 and other dyes, as well as organic purple, lisol Red |
Tobias acid - Risk and Safety
| Risk Codes | R36/37/38 - Irritating to eyes, respiratory system and skin. R40 - Limited evidence of a carcinogenic effect |
| 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. |
| UN IDs | 2585 |
| WGK Germany | 1 |
| RTECS | QK1250000 |
| TSCA | Yes |
| Hazard Class | 8 |
| Packing Group | III |
Tobias acid - Upstream Downstream Industry
Tobias acid - Nature
Open Data Verified Data
White needle-like crystals, slightly soluble in cold water, soluble in hot water, very slightly soluble in ethanol and ether.
Last Update：2024-01-02 23:10:35
Tobias acid - Preparation Method
Open Data Verified Data
2-naphthol in O-nitroethylbenzene solvent, with chlorosulfonic acid sulfonated to produce 2-naphthol 1-sulfonic acid, with soda ash neutralization separation of 2-naphthol -1-sulfonic acid, ammonolysis with liquid ammonia in the presence of ammonium bisulfite to obtain 2-1-sodium naphthylamine sulfonate, then acidified and filtered with hydrochloric acid to obtain 2-1-naphthylamine sulfonic acid.
Last Update：2022-01-01 10:56:21
Tobias acid - Application
Open Data Verified Data
azo dyes and azo pigment intermediates, used in the manufacture of J acid and), acid, phenol AS-SW, reactive red K-1613 and other dyes, as well as organic purple red, lisol purple red and lisol red and other pigments.
Last Update：2025-08-19 16:24:40
Tobias acid - Safety
Open Data Verified Data
- easy oxidation, toxic LD50 1.9g/kg, instilled into the rabbit eye 500mg 24H after a certain stimulation. The operator should wear protective gear.
- The bag is lined with plastic bag, or polypropylene woven bag or wooden box. 50kg net weight per bag. Store in a cool, dry and ventilated place. Storage and transport, should pay attention to sunscreen, moisture, fire. According to the provisions of the storage and transportation of toxic chemicals.
Last Update：2025-06-10 22:55:16
Tobias acid - Reference Information
| NIST chemical information | information provided by: webbook.nist.gov (external link) |
| EPA chemical substance information | information provided by: ofmpeb.epa.gov (external link) |
| Application | tocinic acid is an intermediate of azo dye, mainly used in the manufacture of J acid and linsol Red R and other dye products. |
| preparation of | a method for preparing refined tocinic acid from tocinic acid wastewater comprises the following steps: (1) the back-extraction liquid obtained from the extraction-back extraction of the waste water from the production of the sulfuric acid is subjected to acid analysis and centrifugal separation, and the filtrate is discarded to obtain the back-extraction material of the sulfuric acid; (2) the alkali solution of the back extraction material of the back extraction material is obtained by heating and alkali dissolution, and then hot filtration; (3) the alkali solution of the back-extraction material is cooled and crystallized, twice acid-separated, and centrifuged and filtered to obtain a tocopherol acid wet product; (4) The tocopherol acid wet product is washed with ethanol, centrifugal filtration, drying to obtain the purity of more than 97.0% of the acid. |
| Use | used as an intermediate of azo dye and azo pigment, used in the manufacture of J acid and gamma acid, phenol AS-SW, reactive Red K-1613 and other dyes This product is an intermediate of azo dyes, used in the manufacture of J acid and gamma acid, phenol AS-SW, reactive red K-1613, organic purple red, lisol purple red and lisol red and other products. azo dyes and azo pigment intermediates, used in the manufacture of J acid and r acid, phenol AS-SW, reactive red K-1613 and other dyes, as well as organic purple red, lisol purple red |
| production method | 2-naphthol is sulfonated with chlorosulfonic acid in O-nitroethylbenzene solvent to produce 2-naphthol -1-sulfonic acid, sodium 2-naphthol -1-sulfonate was obtained by neutralization and separation with soda ash, and then the solution was amolyzed in the presence of amino acid ammonium sulfite to obtain sodium 2-naphthylamine -1-sulfonate, which was acidified with hydrochloric acid and filtered, 2-naphthylamine -1-sulfonic acid was obtained. Raw material consumption quota: 2-naphthol (98%) 710kg/t, chlorosulfonic acid (95%)700kg/t, O-nitroethylbenzene (98%)176kg/t, liquid ammonia (99%)300kg/t, soda ash 335kg/t. |
| category | toxic substances |
| toxicity grade | low toxicity |
| Acute toxicity | oral-rat LD50: 19400 mg/kg |
| stimulation data | Skin-rabbit 500 mg/24 h mild |
| flammability hazard characteristics | flammability; Toxic nitrogen oxide and sulfur oxide fumes from combustion |
| storage and transportation characteristics | warehouse ventilation and low temperature drying |
| fire extinguishing agent | dry powder, foam, sand, carbon dioxide, water mist |
| toxic substance data | information provided by: pubchem.ncbi.nlm.nih.gov (external link) |
Last Update：2024-04-10 22:29:15
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View History
Tobias acid
106133-20-4
2-AMINO-1-METHYLBENZIMIDAZOLE
1-十二烷醇
28371-16-6
35942-94-0
4-羟基-4'-羧基偶氮苯
丁二酸(标准品)
1160574-62-8
尼妥必敏
106133-20-4
2-AMINO-1-METHYLBENZIMIDAZOLE
1-十二烷醇
28371-16-6
35942-94-0
4-羟基-4'-羧基偶氮苯
丁二酸(标准品)
1160574-62-8
尼妥必敏
Raw Materials for Tobias acid
Downstream Products for Tobias acid