| abstract |
A method for purifying 2-aminonaphthalene-1-sulfonic acidnacid containing more than 0.1 wt.n2-naphthylamine characterized in that it isn2-aminonaphthalene-1-sulfonic acid solutionnadding a diazonium salt solution in portionsnaromatic amine formulanFROMnwherein X, Y, Z is hydrogen, alkyl of 1 to 4 atomsncarbon, phenyl, halogen, nitro, hydroxy, sulfoamido,nacetylamido-, -OR, wherein R is alkylnwith 1 to 4 carbon atoms in molar ration1: 1 to 1: 10, insolublenthe dye is mechanically separated and after acidificationnof the filtrate to pH 2, 2-aminonaphthalene-1-sulfoacid was precipitatednfiltered and dried. |