Aniline is a crucial intermediate from which more than 300 important products can be derived. Globally, there are about 80 aniline manufacturers, with a total annual production capacity exceeding 2.7 million tons, and an actual output of around 2.3 million tons. The largest consumption area is MDI (methylene diphenyl diisocyanate), which accounted for about 84% of total aniline consumption in 2000.
Aniline Oil is one of the most important intermediates in the dye industry. It is also a key raw material for pharmaceuticals, rubber accelerators, and antioxidants. In addition, Aniline C6H5NH2 can be used to manufacture fragrances, varnishes, and explosives. As a widely used aniline chemical, it plays a central role in the production of dyes, medicines, resins, varnishes, perfumes, vulcanized rubber, and even solvents.
Industrial aniline is also an important raw material for pesticide production. From aniline, derivatives such as alkylaniline, N-alkylaniline, o-nitroaniline, o-phenylenediamine, phenylhydrazine, and cyclohexylamine can be synthesized. These intermediates are used in the preparation of fungicides (e.g., carboxin, mefenoxam, thiophanate, carbendazim, benomyl), insecticides (e.g., triazophos, phosalone, quinalphos), and herbicides (e.g., alachlor, acetochlor, butachlor, prometryn, imazapyr).
Aniline is also used as an analytical reagent, as well as in the synthesis of dyes, resins, varnishes, and fragrances.
As a weak base, Aniline Oil can precipitate easily hydrolyzed salts of trivalent and tetravalent elements (such as Fe³⁺, Al³⁺, Cr³⁺) in the form of hydroxides, thereby separating them from divalent elements (such as Mn²⁺) that are difficult to hydrolyze. In microcrystal analysis, industrial aniline can be applied to detect elements (Cu, Mg, Ni, Co, Zn, Cd, Mo, W, V) capable of forming thiocyanate complexes or other precipitable anions. It is also used in tests for halogens, chromates, vanadates, nitrites, and carboxylic acids. Beyond analytical chemistry, aniline chemical is widely employed in solvents, organic synthesis, and large-scale dye manufacturing.
Aniline intermediates and derivatives include: 2,6-diethylaniline, N-acetanilide, p-butylaniline, o-phenylenediamine, diphenylamine, diazoaminobenzene, 4,4'-diaminotriphenylmethane, 4,4'-diaminodiphenylcyclohexylmethane, N,N-dimethylaniline, N,N-diethylaniline, p-acetamidophenol, p-aminoacetophenone, 4,4'-diethylaminobenzophenone, 4-(p-aminophenyl)butyric acid, p-nitroaniline, N-nitrodianiline, β-acetanilide, 1,4-diphenylurea, 2-phenylindole, p-benzanilide, N-formylaniline, N-benzoylaniline, 2,4,6-trichloroaniline, p-iodoaniline, 1-aniline-3-methyl-5-pyrazole ketone, hydroquinone, dicyclohexylamine, 2-(N-methylaniline)acrylonitrile, 3-(N-diethylaniline)acrylonitrile, 2-(N-diethylaniline)ethanol, p-aminoazobenzene, phenylhydrazine, thiourea derivatives, 4,4'-methylenedianiline, phenyl isocyanates, N-methyl-N-(β-hydroxyethyl)aniline, N-methyl-N-(β-chloroethyl)aniline, N,N-dimethyl-p-phenylenediamine, N,N,N',N'-tetramethyl-p-phenylenediamine, and many others.
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