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| | 2-Amino-4,8-naphthalenedisulfonic acid Basic information |
| | 2-Amino-4,8-naphthalenedisulfonic acid Chemical Properties |
| Risk Statements | 36/37/38 | | Safety Statements | 26-36/37/39 | | Toxicity | rat,LD50,oral,11400mg/kg (11400mg/kg),"Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1058, 1986. |
| | 2-Amino-4,8-naphthalenedisulfonic acid Usage And Synthesis |
| Chemical Properties | 2-Aminonaphthalene-4,8-disulfonic acid [131-27-1]. (3-aminonaphthalene-1,5-disulfonic acid), Cassella acid, C acid, C10H9NO6S2, Mr 303.32, and its salts are readily soluble in water. Reduction with sodium amalgam desulfonates 2-Aminonaphthalene-4,8-disulfonic acid to give 2-aminonaphthalene-8-sulfonic acid, whereas boiling with dilute sulfuric acid results in desulfonation and hydrolysis to give 2- hydroxynaphthalene-4-sulfonic acid. Alkali fusion (KOH, 215℃) produces 2-amino-4-hydroxynaphthalene-8-sulfonic acid. | | Uses | 2-Amino-4,8-naphthalenedisulfonic Acid is used in green preparation method of direct blended blue D 3GL. | | Uses | Cassella acid is an important diazo component for yellow direct and reactive dyes. | | Production Methods | The iron(II) salt of 3-nitronaphthalene-1,5-disulfonic acid (nitro-Armstrong acid) is reduced with iron in dilute acid. A claimed improvement involves isolation of nitro-Armstrong acid from the nitration products of naphthalene-1,5-disulfonic acid as the crystalline magnesium salt prior to catalytic reduction to C acid. |
| | 2-Amino-4,8-naphthalenedisulfonic acid Preparation Products And Raw materials |
| Raw materials | Nitric acid-->FUMING SULFURIC ACID-->Naphthalene-->Magnesium carbonate | | Preparation Products | Direct Blue 71-->Pigment Red 53:1-->Direct Black 103-->Direct Blending Yellow D-3RNL-->Direct Blend Blue-->Reactive Blue 222-->Reactive Yellow 3-->2-NAPHTHYLAMINE-4,6,8-TRISULFONIC ACID-->Reactive Yeiiow M-3RE-->Reactive Yellow KE-4RN-->Direct Yellow 86-->PROCION BLUE H-5R-->Durazol Brown 4RNS-->Direct black 75 (C.I. 35870)-->1,5-Naphthalenedisulfonic acid, 3-[[4-[[4-[(4-amino-2,5-dimethylphenyl)azo]-6(or 7)-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-, trisodium salt-->1,5-Naphthalenedisulfonicacid,3-[[4-[[4-[(4-amino-5-methoxy-2-methylphenyl)azo]-6(or7)-sulfo-1-naphthalenyl]azo]-1-naphthalenyl]azo]-,trisodiumsalt-->tetrasodium 3,3'-[carbonylbis[imino(5-methoxy-2-methyl-4,1-phenylene)azo]]bis(naphthalene-1,5-disulphonate)-->Direct Yellow 86-->Direct Black 103-->DIRECT YELLOW 50 |
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