Chinese name: H acid; 1-amino-8-naphthol-3,6-disulfonic acid
English name: 1-amino-8-naphthol-3,6-disulfonic acid
Relative molecular weight or atomic weight: 319.31
Appearance: Colorless crystal
Dissolution: Slightly soluble in cold water, soluble in alkaline solutions such as soda ash and caustic soda.
Usage: H-acid monosodium salt is mainly used in the production of acid, direct and reactive dyes, such as Acid Fuchsin 6B, Acid Scarlet G, Acid Black 10B, Direct Black, Reactive Brilliant Red K-2BP, Reactive Violet K- There are more than 90 kinds of 3R, reactive blue KR, etc. These dyes are used for dyeing wool and cotton fabrics. It can also be used to produce medicines.
Preparation or source: The disodium salt of Koch acid (1-naphthylamine-3,6,8-trisulfonic acid) and concentrated caustic soda solution are heated and melted in an autoclave at about 180-190 ° C, and then The melt is dissolved in water, and then obtained by acidification and precipitation.
