Aniline CAS 62-53-3

Aniline is an important raw material for the dye industry. It has played an important role in the development of the artificial dye industry. In 1856, the 18-year-old British chemist Pan Qin extracted aniline from coal tar, added potassium dichromate, and found a black precipitate by accident. This was the first artificial dye, which was called aniline violet at that time, because It turns purple in alcohol. This is an ideal dye that is wash-fast, light-fast, durable and brilliantly coloured. Pan Qin opened the first artificial dye factory after obtaining the British patent, and first sold artificial dyes. Coal tar was a kind of waste before, but Pan Qin’s invention turned coal tar from waste into treasure. Indigo is a blue natural vegetable dye that is processed from the indigo plant. In 1870, the German chemist Bayer first completed the industrial production of indigo, which was also produced by using aniline as the main raw material and co-heating monochloroacetic acid, followed by alkali fusion oxidation and other reactions. Aniline is also used to prepare basic fuchsin dyes that dye wool, silk, and cotton fabrics in purple. It is also used to prepare the oxidation dye nigrosine. The latter is also called Anilin black, or Jingyuan, which is characterized by being washable and light-resistant. Soak fur and cotton fabrics in aniline hydrochloride and oxidize with an oxidizing agent such as sodium chlorate to form aniline black on the surface of the fabric. Excessive oxidation is blue-black and brittle, while under-oxidation is greenish. Aniline is also the basic raw material of sulfonamide drugs. Aniline is first sulfonated to produce p-aminobenzenesulfonic acid, and then derived from it to make various sulfa drugs. Aniline is also an important raw material for some synthetic resins, and is also used as a rubber vulcanization accelerator.

Aniline series intermediates and dyes include: 2,6-diethylaniline N-acetaniline, p-butylaniline, o-phenylenediamine, diphenylamine, diazoaminobenzene, 4,4′-diaminotriphenyl Methane, 4,4’diaminodiphenylcyclohexylmethane, N,N-dimethylaniline, N-ethylaniline, N,N-diethylaniline, N,N-dipropylaniline, p-ethylaniline Aminophenol, p-aminoacetophenone, 4,4′-diethylaminobenzophenone, 4-(p-aminobenzene)butyric acid, p-nitroaniline, N-nitrosodiphenylamine, β-acetanilide , 1,4-diphenylsemicarbazide, 2-phenylindole, p-aniline, N-formanilide, N-benzanilide, N-acetanilide, 2,4,6-trichloroaniline , p-iodoaniline, 1-aniline-3-methyl-5-pyrazolone, hydroquinone, dicyclohexylamine, 2-(N-methylanilino)propionitrile, 3-(N-ethyl Anilino)propionitrile, 2-(N-ethylanilino)ethanol, p-aminoazobenzene, phenylhydrazine, monophenylurea, diphenylurea, p-thiocyanatoaniline, 4,4’diphenyl Methane diisocyanate, polyphenyl polymethyl polyisocyanate, 4-aminoacetanilide, N-methyl-N-(β-hydroxyethyl)aniline, N-methyl-N(β-chloroethyl)aniline, N,N-dimethyl-p-phenylenediamine, N,N,N’,N’-tetramethyl-p-phenylenediamine, N,N-diethyl-p-phenylenediamine, 4,4′-methylenebis (N,N-diethylaniline, phenylthiourea, diphenylthiourea, p-aminobenzenesulfonic acid, 4,4’diaminodiphenylmethanebenzoquinone, N,N-diethanolaniline, acetoacetyl Aniline, p-aminophenol, N-ethylbenzylaniline, N-methylformanilide, N-methylacetanilide, p-bromoacetanilide, bis(p-aminocyclohexyl)methane, phenylhydrazone diphenylcarbazone, Acetophenone phenylhydrazone, aniline-2,4-disulfonic acid, p-aminoazobenzene-4’sulfonic acid, phenylhydrazine-4-sulfonic acid, thioacetanilide, 2-methylindole, 2,3 -Dimethylindole, N-methyl-2-phenylindole.