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https://www.aolisenchem.com/

As one of the best pharmaceutical ingredients manufacturers and active pharmaceutical ingredient manufacturers from China, Aolisenchem has continuously improved the core competitiveness of chemical intermediates production technology, which is specifically reflected in the choice of chemical reaction process, process control, the choice of core catalysts and so on, strive to improve the production efficiency and product quality of the enterprise, continue to innovate independently, and expand various unit reaction processes.

1. The Introduction of Dye Intermediates
Dye intermediates, also known as intermediates, generally refer to various aromatic derivatives used in the production of dyes and organic pigments. They are prepared by using aromatic hydrocarbons such as benzene, toluene, naphthalene and anthracene from coal chemical industry and petrochemical industry as basic raw materials through a series of organic synthesis unit processes (see reaction process).

With the development of the chemical industry, the scope of application of dyestuff intermediates has been extended to the pharmaceutical industry, pesticide industry, explosives industry, information recording material industry, as well as auxiliary agents, surfactants, fragrances, plastics, synthetic fibers and other production sectors. There are many varieties of dye intermediates, and there are hundreds of more important ones.

2. Classification of Dye Intermediates
Dye intermediates mainly include benzene series intermediates, toluene series intermediates, naphthalene series intermediates and anthraquinone series intermediates. In addition, there are some heterocyclic intermediates. The reaction processes commonly used by pharmaceutical intermediates manufacturers in the production of intermediates mainly include nitration, sulfonation, halogenation, reduction, amination, hydrolysis, oxidation, condensation, etc.

The synthesis of a dye intermediate with a more complex structure often requires many unit processes, and sometimes different basic raw materials and different synthetic routes can be used.

Agrochemical intermediates used in the manufacture of dyes, pesticides or medicines usually have complex structures and are often produced in conjunction with the final product. The output is small, and the production mostly adopts intermittent operations. Some intermediates with a wide range of uses, such as nitrobenzene, aniline, chlorobenzene, phenol, are usually produced in comprehensive large-scale chemical plants with large output and continuous operation.