4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
- CAS No.
- 82-47-3
- Chemical Name:
- 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
- Synonyms
- 8-Amino-5,7-disulfo-1-naphthol;8,1,5,7-Aminonaphtholdisulfonic acid;1-Amino-8-naphthol-2,4-disulfonic acid;8-Amino-1-hydroxy-5,7-disulfonaphthalene;4-amino-5-hydroxynaphthalene-1,3-disulfonicaci;1-AMino-8-naphthol-2,4-disulfonic acid(SS Acid);4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid;4-Amino-5-Hydorxy-1,3-Naphthalenedisulfonic Acid;4-amino-5-hydroxynaphthalene-1,3-disulfonic acid;1-Amino-8-hydroxynaphthalene-2,4-disulfonic acid
- CBNumber:
- CB7925021
- Molecular Formula:
- C10H9NO7S2
- Molecular Weight:
- 319.31
- MOL File:
- 82-47-3.mol
- MSDS File:
- SDS
- Modify Date:
- 2023/11/7 16:59:59
EPA Substance Registry System | 1,3-Naphthalenedisulfonic acid, 4-amino-5-hydroxy- (82-47-3) |
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SAFETY
Risk and Safety Statements
Symbol(GHS) | GHS05 |
---|---|
Signal word | Danger |
Hazard statements | H314 |
Precautionary statements | P260-P264-P280-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P321-P305+P351+P338-P405-P501 |
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Chemical Properties,Uses,Production
Chemical Properties
1-Amino-8-hydroxynaphthalene-2,4-disulfonic acid [82-47-3]. (4-amino-5-hydroxynaphthalene-1,3-disulfonic acid), Chicago acid, 2 S acid, C10H9NO7S2, Mr 319.3, and its acid sodium salt are readily soluble in water; the latter can be salted out with sodium chloride. In alkaline solution, coupling with diazo compounds takes place ortho to the hydroxyl group. Alkaline hydrolysis at 170℃ gives 1,8-dihydroxynaphthalene-2,4-disulfonic acid. Heating with dilute sulfuric acid results in desulfonation to give 1-amino-8-hydroxynaphthalene-2-sulfonic acid.
Uses
Chicago acid is used as a coupling component for C.I. Direct Blue 1, C.I. Direct Blue 22, and C.I. Direct Blue 76 (the dicopper complex of demethylated).
Production Methods
A solution of the disodium salt of naphthosultam-2,4-disulfonic acid is concentrated and mixed with potassium hydroxide liquor at 130℃. The temperature is raised to 155℃ over 20 h to complete the reaction. After being cooled and diluted with water, the melt is run into excess hydrochloric acid and the monopotassium salt is collected by filtration at 30℃ and slurry washed with recycling of the wash liquors. A yield of 87 % is obtained.
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Preparation Products And Raw materials
Raw materials
Preparation Products
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