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4-amino-5-hydroxynaphthalene-1,3-disulphonic acid

4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Structure
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
  • CAS No.82-47-3
  • Chemical Name:4-amino-5-hydroxynaphthalene-1,3-disulphonic acid
  • CBNumber:CB7925021
  • Molecular Formula:C10H9NO7S2
  • Formula Weight:319.31
  • MOL File:82-47-3.mol
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Property
Hazard and Precautionary Statements (GHS)
  • Symbol(GHS)
  • Signal wordDanger
  • 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,Usage,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
4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Suppliers
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4-amino-5-hydroxynaphthalene-1,3-disulphonic acid Spectrum
82-47-3, 4-amino-5-hydroxynaphthalene-1,3-disulphonic acidRelated Search:
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  • 82-47-3
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  • 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid ISO 9001：2015 REACH
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  • 4-amino-5-hydroxynaphthalene-1,3-disulphonic acid

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