130-23-4

Name	4-amino-5-hydroxynaphthalene-1,7-disulfonic acid
Synonyms	K ACID AI3-50014 EUROPEAN K-ACID 1-amino-8-naphtho-4,6-Disulfonic acid 1-Amino-8-Naphthol-4,6-Disulfonic Acid 1-AMINO-8-NAPHTHOL-4,6-DISULFONIC ACID 4-amino-5-hydroxynaphthalene-1,7-disulfonic acid 4-Amino-5-hydroxynaphthalene-1,7-disulphonic acid 4-amino-5-hydroxynaphthalene-1,7-disulphonic acid l,7-Naphthalenedisulfonic acid, 4-amino-5-hydroxy-
CAS	130-23-4
EINECS	204-982-3
InChI	InChI=1/C10H9NO7S2/c11-7-1-2-9(20(16,17)18)6-3-5(19(13,14)15)4-8(12)10(6)7/h1-4,12H,11H2,(H,13,14,15)(H,16,17,18)

Molecular Formula	C10H9NO7S2
Molar Mass	319.31
Density	1.880±0.06 g/cm3(Predicted)
Water Solubility	20g/L at 26.4℃
pKa	-0.83±0.40(Predicted)
Refractive Index	1.764
Physical and Chemical Properties	Light brown powder. Slightly soluble in cold water, soluble in hot water, soluble in soda ash or caustic soda solution, and ferric chloride yellow green role.

LogP	-2.33
Application	used as an intermediate of azo dyes, reactive dyes and organic pigments, mainly used in the production of cationic dyes, reactive brilliant red K-2G, etc.
production method	is derived from 1-Naphthylamine -4,6, 8-trisulfonic acid by neutralization, alkali fusion and acidification. The 1-Naphthylamine -4,6, 8-trisulfonic acid is neutralized with soda ash solution to obtain the sodium naphthylamine trisulfonate, and then alkali-fused with sodium hydroxide solution at 178-184 ℃; it was then acidified with sulfuric acid for 4H at 0.7-0.78MPa. The resulting product was a rice-brown powder with a K-acid content of 80%.

Last Update：2024-04-09 21:01:54