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Dye Intermediates, also known as intermediates, generally refer to various aromatic derivatives used in the production of dyes and organic pigments. They are prepared using aromatic hydrocarbons such as benzene, toluene, naphthalene and anthracene from coal chemical and petrochemical industries as basic raw materials through a series of organic synthesis unit processes. With the development of the chemical industry, the scope of application of dye 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. In the early days, the most important dye intermediates, such as nitrobenzene, aniline, phenol, chlorobenzene, and phthalic anhydride, have developed into important basic organic intermediates due to their wide use and large usage. More than 10,000 tons. The most important dye intermediates are o-nitrochlorobenzene, p-nitrochlorobenzene, o-nitrotoluene, p-nitrotoluene, 2-naphthol, anthraquinone, 1-aminoanthraquinone and so on. Starting from the above intermediates, and then going through a series of organic synthesis unit processes, various intermediates with complex structures can be prepared.

Dye Intermediate introduction

Dye Intermediate 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 dye 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. In the early days, the most important dye intermediates, such as nitrobenzene, aniline, phenol, chlorobenzene, and phthalic anhydride, have developed into important basic organic intermediates due to their wide use and large usage. More than 10,000 tons. The most important dye intermediates are o-nitrochlorobenzene, p-nitrochlorobenzene, o-nitrotoluene, p-nitrotoluene, 2-naphthol, anthraquinone, 1-aminoanthraquinone and so on. Starting from the above-mentioned intermediates, and then going through a series of organic synthesis unit processes, various intermediates with complex structures can be prepared.

Dye Intermediate
Dye Intermediate

Chemical Substances of Dye Intermediate

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 in the production of dye intermediates mainly include nitration, sulfonation, halogenation, reduction, amination, hydrolysis, oxidation, condensation, etc. The synthesis of an intermediate with a more complex structure often requires many unit processes, and sometimes different basic raw materials and different synthetic routes can be used. For example, in the production of p-nitroaniline, benzene is initially nitrated and reduced to obtain aniline, followed by acetylation, nitration, and hydrolysis. This method has a long production process and high cost. The synthetic route of benzene chlorination, nitration, separation to obtain p-nitrochlorobenzene, and then high-pressure ammonolysis has been changed. Special 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, etc., are usually produced in comprehensive large-scale chemical plants with large output and continuous operation.

Application of Dye Intermediate

  • O-chlorobenzoic acid
    Anti-mold agent, it can prevent the clothes from becoming moldy and rotting. The main raw material to make it is an intermediate-o-chlorobenzoic acid. Ortho-chlorobenzoic acid is an important intermediate in pesticide, pharmaceutical and dye industries with a wide range of uses. It is mainly used in the synthesis of pesticides (Su Urea No. 1) and antifungal agents in pesticides, and is mainly used in the synthesis of pesticides. The antipsychotic drugs perphenazine, the adrenal gland drugs Zengrubensin and Chuantong, the antifungal drugs clotrimazole, chlorpromazine, ketamine and diclofenac, are standard reagents for alkalimetry and iodometry, used as adhesives And paint preservatives. In addition, it also plays a major role in dyes. We cannot do without taking photos every day. Everyone has their own photos. The main body of the photo is film, and the main body of the film can be made of o-chlorobenzoic acid. In chemistry, isomers often have similar chemical properties, so p-chlorobenzoic acid also has similar functions to o-chlorobenzoic acid, and is also an intermediate of pesticides and pharmaceutical dyes. Because of them, life has more colorful beauty and memories that can last forever. Promote the progress of life and improve the quality of life.
  • Biscinol
    In contemporary life, mobile phones, TVs, refrigerators, and cars have become an important part of our lives. These products have brought many conveniences and excitements to our lives. Using mobile phones, you can chat and talk with friends and relatives in different places through a thin layer of display screen. With TV, you can watch the customs and beautiful scenery all over the world, and you can learn and entertain. The use of refrigerators prolongs the freshness time of food, and the use of cars makes us walking faster and more comfortable. An important part of these products is biphenyl diphenol. Biphenyldiol is an important organic intermediate, used as rubber antioxidant and plastic antioxidant, and can also be used in colorless vulcanized rubber products, food packaging rubber products and medical latex products. The tires on the vehicles we ride, the plastic bags we use for shopping, the table tennis bats for entertainment, the rubber seals on the food packaging mouths, and the medical gloves in the hospital can all be made of dihydroxybenzene. In terms of synthetic polymers, due to its excellent heat resistance, it can be used as a modified monomer of polyester, polyurethane, polycarbonate, polysulfone and epoxy resin to produce excellent engineering plastics and composite materials. Wait. In automobiles, engineering plastics are mainly used as bumpers, fuel tanks, dashboards, body panels, doors, lamp covers, fuel pipes, radiators, and engine-related parts; in machinery, engineering plastics can be used for bearings, gears, Screw nuts, seals and other mechanical parts and housing, cover plates, handwheels, handles, fasteners and pipe joints and other mechanical structural parts; in electronic appliances, engineering plastics can be used for wire and cable coating, printed circuit boards , Insulating film and other insulating materials and structural parts of electrical equipment; in household appliances, engineering plastics can be used in refrigerators, washing machines, air conditioners, TV sets, electric fans, vacuum cleaners, electric irons, microwave ovens, rice cookers, radios, and sound systems. Equipment and lighting appliances; in the chemical industry, engineering plastics can be used in chemical equipment such as heat exchangers, chemical equipment linings, and pipes and pipe fittings, valves, pumps and other chemical pipelines. In addition to these, its high-purity products are mainly used to synthesize liquid crystal polymers. Mainly used to make LCD screens for mobile phones, TVs and other electronic products.