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Synthesis of reactive black 5 dye
Accepted Answer
Reactive Black 5 is an azo dye used for dyeing cellulosic fibers such as cotton and viscose. Synthesis of Reactive Black 5 involves the following steps:
1. Diazotization of 4-nitroaniline
2. Coupling of the diazonium salt with 1-naphthol-4-sulfonic acid
3. Reduction of the azo group
The overall reaction can be represented as follows:
4-nitroaniline + 1-naphthol-4-sulfonic acid + NaNO2 + HCl → Reactive Black 5 + NaCl + H2O
Reactive Black 5 is a water-soluble dye that is applied to the fiber in an alkaline bath. The dye then reacts with the hydroxyl groups on the fiber to form covalent bonds, resulting in a permanent dye. Reactive Black 5 is a versatile dye that can be used to produce a wide range of shades, from black to brown to gray.
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