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Solvent Red 24, also known as Sudan IV, is a synthetic azo dye widely used for coloring nonpolar substances such as oils, waxes, plastics, and hydrocarbon-based materials. It is also utilized in biological staining to identify lipids and lipoproteins.

Synonyms

  • Sudan IV
  • Oil Red BB
  • Fat Red B
  • Scarlet Red
  • C.I. 26105
  • Red 3
  • Oil Red 7
  • Oil Red A
  • Oil Red D
  • Oil Red F
  • Solvent Red 2B
  • Solvent Red 380
  • Transparent Red BR
  • Oil Red 2B
  • Oil Red BR
  • Oil Red GBC

Chemical Identifiers

  • IUPAC Name: 1-[(2-Methylphenyl)azo]-2-naphthol
  • CAS Number: 85-83-6
  • Molecular Formula: C₂₄H₂₀N₄O
  • Molecular Weight: 380.44 g/mol

Physical and Chemical Properties Appearance

Red powder
Solubility: Insoluble in water; soluble in organic solvents such as ethanol, acetone, and benzene
Melting Point: 184-185°C
Density: Approximately 1.20 g/cm³
Light Fastness: Rated 5-6 (on a scale where higher values indicate better resistance)
Heat Resistance: Stable up to 200°C
Acid Resistance: Rated 4
Alkali Resistance: Rated 4
Water Resistance: Rated 5

Applications

Solvent Red 24 is extensively used in:
Coloring plastics such as PS, HIPS, ABS, RPVC, PMMA, and SAN
Dyeing waxes, oils, lubricants, and fuels
Manufacturing candles, paints, and shoe polishes
Producing printing inks and pen inks
Staining lipids in biological specimens

Solvent Red 24

A synthetic azo dye with powerful red brightness and solubility in organic solvents, Solvent Red 24 has developed wide use in various industries. Given the presence of one or more azo groups (-N=N-) in their molecular structure, which provides bright hues, it is part of the azo dye family. This dye is particularly significant for applications requiring excellent solubility, stability, and intense coloration in non-polar environments.

Properties to Chemical

The chemical formula of Solvent Red 24 is C18H14N2O, and its chemical name is N-(2,4-Dimethylphenyl)-azo-2-naphthylamine. It is approximately 274.32 g/mol at a molecular level. The dye is proper for demanding applications for its superior chemical and thermal stability. Red crystalline powder is the typical form that it is offered.

The vibrant red color of Solvent Red 24 is attributed to its azo bond, which allows for strong light absorption in the visible spectrum. The chromophore group interacts with the aromatic rings in the structure, creating a resonance effect that enhances its coloration.

Applications

1.Fuel and Lubricants Industry

Solvent Red 24 is extensively used as a fuel dye to distinguish between different grades of fuel or to identify tax-exempt or untaxed fuels. Government’s mandate its use in some cases to color fuels like diesel or kerosene for legal and regulatory purposes. For example, “red-dyed diesel” in some countries signifies off-road or agricultural use, making it easily distinguishable from on-road diesel.

2. Polymers and Plastics

Solvent Red 24 is used in the plastics industry to impart polymer-based things such as polystyrene, polyvinyl chloride (PVC), and polycarbonate the shade of red. It is good for high-temperature processing for its high solubility and heat resistance.

3. Industries: Textile and Ink

The dye finds applications in the textile industry for coloring synthetic fibers and in the production of solvent-based printing inks, where its vivid color enhances the visual appeal of printed materials.

4. Leather company operations

Solvent Red 24 is also used in the leather company to dye leather products, creating clear, long-lasting red hues.

Environmental and Health Certain components

Although Solvent Red 24 is valued for its functional properties, it has potential health and environmental concerns. It can emit aromatic amines, which are related to carcinogenic concerns, when it breaks down, just like other azo dyes. Many nations have laws governing its use in order to safeguard human health and the environment.

To avoid adverse reactions, handling and disposal have to be done properly. Protective gear must be worn by workers handling Solvent Red 24 to prevent skin contact or inhalation. In order to avoid degrading land and water resources, environmental regulations frequently mandate appropriate disposal.

The Regulatory Structure

Several countries have laws regulating the usage of Solvent Red 24. Its use is frequently required in petroleum-based industries to track and manage tax compliance. 

Solvent Red 24 is a common and adaptable dye that finds extensive use in a variety of industries. It is a necessary component of fuels, polymers, inks, and other products due to its vivid red colour, stability, and solubility. To reduce potential dangers, its use requires strict adherence to safety guidelines and environmental laws. Its usefulness and responsible use are balanced, which emphasises how crucial sustainable practices are for industrial applications.