Triethanolamine → Aniline

Participants

Reaction Steps

The 1:1-chrome complex containing 43.4 parts of the dye formed from diazotised 4-nitro-2-aminophenol-6-sulfonic acid and 1-(4'-methylphenyl)-3-methyl-5-pyrazolone as well as 5.2 parts of chromium is introduced into 250 parts of water and 250 parts of triethanolamine, and 15.4 parts of 4-nitro-2-aminophenol and 22.6 parts of the monoazo dye formed from diazotised aniline and salicylaldehyde are added. The reaction mixture is held, with stirring, at pH 7.5-8 and at 80° C. until the formation of the 1:2-complex dye is complete. The reaction mixture is then neutralised with hydrochloric acid; it is subsequently filtered, and the dye is rinsed with 750 parts of 25% sodium chloride solution and dried. It dyes wool, polyamide and leather in an orange shade having good fastness properties.

Provenance & Evidence