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Sulfonation:

Chloro-Sulfonation:

Nitration:

Nitrosation:

Acetylation:

Reduction:

Hydrogenation (Catalyst:Ni,Pd/C,Pd/Al2O3,Rh/C):

High Technology/Cost Reduction:

Halogenation:

The chemical reactions that are most commonly used in industrial intermediates for the processing of raw materials are as follows:

(1) sulfonation reaction
(2) nitration reaction
(3) halogenation reaction
(4) reduction reaction to prepare an amino group
(5) diazotization reaction (often accompanied by coupling reaction)
(6) The sulfonic acid group is substituted into a hydroxyl group by an alkali melting reaction
(7) acylation reaction
(8) oxidation reaction
(9) condensation and carbonation reaction
(10) Aromatization reaction (mainly amino)
(11) mutual exchange reaction of hydroxyl groups with amino groups
(12) hydroxylation or amino group

According to the fine chemical intermediates main body aromatic ring structure, intermediates can be divided into fat, benzene, naphthalene, anthraquinone, heterocyclic and fused ring system. China can produce benzene, naphthalene, anthraquinone, heterocyclic and other dyeing, pigment intermediates more than 400 varieties, basically able to meet the dye, pigment industry development needs.