Name | monosodium salt monohydrate,H Acid |
Synonyms | H Acid monosodium salt monohydrate,H Acid 4-amino-5-hydroxynaphthalene-2,7-disulfonate 4-amino-5-hydroxynaphthalene-2,7-disulfonic acid SODIUM 4-AMINO-5-HYDROXY-2,7-NAPHTHALENEDISULFONATE Monosodium 4-amino-5-hydroxy-2,7,-naphthalenedisulfonate sodium hydrogen 4-amino-5-hydroxynaphthalene-2,7-disulfonate 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid sodium salt sodium 5-amino-4-hydroxy-7-sulfonaphthalene-2-sulfonate hydrate 2,7-Naphthalenedisulfonicacid,4-amino-5-hydroxy-,monosodiumsalt 1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid, monosodium salt 8-Amino-1-naphthol-3,6-disulfonic acid monosodium salt monohydrate |
CAS | 5460-09-3 |
EINECS | 226-736-4 |
InChI | InChI=1/C10H9NO7S2.Na.H2O/c11-8-3-6(19(13,14)15)1-5-2-7(20(16,17)18)4-9(12)10(5)8;;/h1-4,12H,11H2,(H,13,14,15)(H,16,17,18);;1H2/q;+1;/p-1 |
Molecular Formula | C10H10NNaO7S2 |
Molar Mass | 343.3 |
Melting Point | >300°C |
Water Solubility | slightly soluble |
Solubility | Easily soluble in hot water, soluble in alkali solution, hardly soluble in cold water, slightly soluble in alcohol and ether |
Appearance | White or off-white powder or needle crystal |
Color | Grayish Brown |
Storage Condition | Store below +30°C. |
Sensitive | Sensitive to light |
MDL | MFCD00150460 |
Physical and Chemical Properties | Gray crystalline powder. |
Use | Mainly used for the production of acidic, direct and reactive dyes |
Risk Codes | 36/37/38 - Irritating to eyes, respiratory system and skin. |
Safety Description | 24/25 - Avoid contact with skin and eyes. |
HS Code | 29222100 |
gray crystalline powder. Soluble in water, ethanol, ethyl ether and alkali and caustic soda and other alkaline solution, the alkaline solution was dark green, brown red ferric chloride.
from naphthalene with fuming sulfuric acid sulfonation of 1,3,6 A naphthalene three sulfonic acid, and then with mixed acid nitration of 1 A Nitro 3,6,8 A naphthalene three sulfonic acid, then it is neutralized with ammonium hydroxide and reduced with iron powder to give 1-amino -3,6,8-triammonium naphthalene trisulfonic acid salt. After pressure filtration, sulfuric acid is added for analysis, Na2 C03 is dissolved, filtered, alkali melted, obtained by acid analysis.
One of the important intermediates in the dye industry, used in the production of other dye intermediates, such as chromotropic acid, acetyl H acid and benzoyl H acid. In addition, can also be used for pharmaceutical.
LogP | -2.3 |
EPA chemical information | Information provided by: ofmpub.epa.gov (external link) |
Uses | Mainly used to produce acidic, direct and reactive dyes Used as an indicator for the determination of halogens by mercury, and also used as an azo dye intermediate This product is an important dye intermediate. |
Production method | The production of H acid monosodium salt from naphthalene as raw material includes the following steps:(1) Naphthalene sulfonation to obtain 1,3, 6-naphthalene sulfonic acid;(3) Nitration mixture is neutralized with ammonia water;(4) The neutralization product nitronaphthalene trisulfonic acid triammonium salt is reduced, and the acidified product T acid is precipitated with sulfuric acid and salt;(5) T acid is converted into sodium salt, alkali fusion and acid precipitation to obtain H acid monosodium salt: There are many steps to prepare H acid monosodium salt from naphthalene, and the total yield is generally 46%-50%. Industrial products are light gray to gray paste, and the content of H acid monosodium salt is 42%. The content of the powdered H-acid monosodium salt is above 83.5% (GB-1648-84) |