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| | 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Basic information |
| Product Name: | 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid | | Synonyms: | 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid;1-Amino-8-hydroxynaphthalene-2,4-disulfonic acid;4-amino-5-hydroxynaphthalene-1,3-disulfonic acid;4-Amino-5-Hydorxy-1,3-Naphthalenedisulfonic Acid;1-Amino-8-naphthol-2,4-disulfonic acid;4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid;8-Amino-1-hydroxy-5,7-disulfonaphthalene;8-Amino-5,7-disulfo-1-naphthol | | CAS: | 82-47-3 | | MF: | C10H9NO7S2 | | MW: | 319.31 | | EINECS: | 201-425-6 | | Product Categories: | Intermediates of Dyes and Pigments | | Mol File: | 82-47-3.mol |  |
| | 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Chemical Properties |
| | 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Usage And Synthesis |
| 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 | Hydrochloric acid-->Potassium hydroxide | | Preparation Products | Evans Blue-->C.I. Direct green 21-->CHICAGO SKY BLUE 6B-->4-Amino-5-hydroxy-6-[[4'-[(1-hydroxy-6-phenylamino-3-sodiosulfo-2-naphthalenyl)azo]-1,1'-biphenyl-4-yl]azo]naphthalene-1,3-disulfonic acid disodium salt-->C.I. Direct Blue, heptasodium salt-->Direct blue 126 (C.I. 34010)-->Direct blue 215 (C.I. 24415)-->DIRECT BLUE 76-->CHLORAZOL BLUE RW-->1,3-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-6-[[3-[6-hydroxy-7-[(2-methoxyphenyl)azo]-8-sulfo-1H-naphth[1,2-d]imidazol-2-yl]phenyl]azo]-, trisodium salt-->4-Amino-5-hydroxy-6-[(2,3,5-trichloro-6-hydroxyphenyl)azo]-1,3-naphthalenedisulfonic acid disodium salt-->Cuprate(2-), [4-amino-5-(hydroxy-κO)-6-[[2-(hydroxy-κO)-5-nitrophenyl]azo-κN1]-1,3-naphthalenedisulfonato(4-)]-, disodium-->Direct Green 21:1 |
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