The dye intermediate refers to various aromatics derivatives used to produce dyes and organic pigments. They are based on aromatics such as benzene, and toluene, from coal chemicals and petrochemical as the basic raw materials, and are made through a series of organic synthesis processes. With the development of the chemical industry, the application scope of the dye intermediate has expanded to the pharmaceutical industry, pesticide industry, fire-explosive industry, and information recording material industry, as well as production departments such as assistants, surfactants, spices, plastics, and synthetic fibers.
TMain Varieties of Dye Intermediates
There are many varieties of dye intermediates, and there are hundreds of important ones. In the early days, the most important dye intermediates, such as nitro, aniline, phenols, chlorobenzene, phthalate, etc., due to wide use and large dosage, it has developed into an important basic organic intermediate. The most important dyes in the middle of the dye are tangentophyllobene, nitro chlorobenzene, tunnel nitrogen benzene, nitrate nitrogen, 2-pyrodhenols, pyrodia, 1-amino cymbal, etc. Starting from the above-mentioned intermediates, and then through a series of organic synthetic units, various intermediates with complex structures can be obtained.
The dye intermediates mainly include benzene-based intermediates, toluene intermediates, cymbal intermediates, and anthraquinone intermediates. In addition, there are some miscellaneous intermediates. The main reactions commonly used in the production of intermediates are nitrification, sulfide, halide, reduction, anodization, hydrolysis, oxidation, contraction, etc.
Applications of Dye Intermediates
Synthesizing an intermediate with a complicated structure, often through many unit processes, can sometimes use different basic raw materials and different synthetic routes. The dedicated intermediate used for manufacturing dyes, pesticides, or medicines is usually complicated in structure. It is often matched with final products. The output is small. Most of the production is used for intermittent operations. Some dye intermediates with extensive uses, such as nitrobenzene, aniline, chloroprene, phenol, etc., are usually produced in comprehensive large-scale chemical plants, with large outputs and continuous operations.
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