| Identification | Back Directory | [Name]
5-Aminonaphthalene-1,3-disulfonic acid | [CAS]
13306-42-8 | [Synonyms]
5-Aminonaphthalene-1,3-disulfonic acid
1,3-Naphthalenedisulfonic acid, 5-amino- | [Molecular Formula]
C10H9NO6S2 | [MOL File]
13306-42-8.mol | [Molecular Weight]
303.31 |
| Hazard Information | Back Directory | [Chemical Properties]
1-Aminonaphthalene-5,7-disulfonic acid [13306-42-8]. (5-aminonaphthalene-1,3- disulfonic acid), C10H9NO6S2, Mr 303.3, and its sodium salt are very soluble in water. Caustic fusion produces 1-amino-5-hydroxynaphthalene-7-sulfonic acid, and sulfonation (40 % oleum, 130 C) yields 1-aminonaphthalene2,5,7-trisulfonic acid. | [Production Methods]
1-Aminonaphthalene-5-sulfonic acid in sulfuric acid solution is treated with 65 % oleum, and the mixture is heated at 120℃ for 4 h. The sulfonation mass, which contains mainly the 2,5,7-trisulfonic acid, is diluted with water, and the batch is heated at 130℃ for 10 h to cause desulfonation. The product crystallizes on cooling and, after isolation, is deacidified by treatment of the solution with lime. The final sodium salt solution is used directly for production of 1-amino-5-hydroxynaphthalene-7-sulfonic acid. |
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