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The foundations of the dye industry
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100 per cent 50 grams 8-naphthol acetic acid solution addition alcohol alkali amines amino group ammonia aniline anthraquinone apparatus autoclave Azo dyes Azo dyes Azo bath benzene blue boiling cent sulfuric acid chloride chlorobenzene color concentrated hydrochloric acid concentrated sulfuric acid condenser Congo red cooled coupling reaction crystals diazo compound diazotized dilute dissolved distillation dried dyes Azo dyes filtered filtrate flask formed Fral fusion grams grams of pure grams of soda H acid HOAS hydrochloric acid iron isomers laboratory liquid material mixed mole mother liquor naphthalene neutral nitric acid nitro nitrobenzene obtained oleum ortho oxidation phenol precipitate preparation reaction mixture reduction salt solution separated SO3H SOAH soda ash sodium hydroxide sodium nitrite sodium salt sodium sulfide soluble solvent steam stirrer sulfate sulfide sulfo group sulfonic sulfuric acid Technical Observations temperature theoretical amount tion Triphenylmethanes tube vessel washed yellow yield