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Solvent Yellow 2, also known as Methyl Yellow, is a synthetic azo dye primarily used for coloring oils, waxes, plastics, and as a pH indicator in various industrial applications.

Synonyms

  • Methyl Yellow
  • Butter Yellow
  • Oil Yellow GG
  • C.I. Solvent Yellow 2
  • 4-Dimethylaminoazobenzene
  • N, N -Dimethyl-4-phenylazoaniline
  • Dimethyl Yellow
  • p-Dimethylaminoazobenzene
  • C.I. 11020

Chemical Identifiers

  •  IUPAC Name: N,N-Dimethyl-4-(phenylazo)aniline
  • CAS Number: 60-11-7
  • Molecular Formula: C₁₄H₁₅N₃
  • Molecular Weight: 225.29 g/mol

Physical and Chemical Properties

Appearance: Yellow to orange crystalline powder
Melting Point: Approximately 111°C (dec.)
Solubility: Insoluble in water; soluble in ethanol, benzene, ether, chloroform, petroleum ether, mineral acids, and oils
Density: 1.2233 g/cm
pH Indicator Range: Red at pH 2.9; yellow at pH 4.0

Applications

Solvent Yellow 2 is utilized in:
Coloring plastics such as PS, HIPS, RPVC, PMMA, and SAN
Dyeing waxes, oils, lubricants, and fuels
Manufacturing candles, paints, and printing inks
Serving as a pH indicator in laboratory settings
Staining in microbiological and histological applications

Solvent Yellow 2

An organic dye that is a member of the azo dye class is Solvent Yellow 2. Its ability convey vivid yellow colouration makes it frequently employed in a variety of industrial applications. Because of its well-known ability to dissolve in non-polar solvents, this dye can be used for a variety of applications, including fuel identification and polymers.

 

Properties of Chemicals

The formula for the molecule of Solvent yellow 2, also referred to as 1-Methyl-4-(phenylazo)benzene, is C13H12N2. It features a bright yellow crystallised when they granule and evaporates well in solvents made from organic molecules such as benzene and toluene. Long-lasting colouration is ensured by the dye’s stability under various circumstances.

 

Applications:

Solvent Yellow 2 is a useful component in many different sectors due to its adaptability. Among its primary uses are:

 

1. Polymers and Plastics
Polyolefins and synthetic fibres are among the plastics that are commonly coloured using Solvent Yellow 2. Its ability to dissolve in organic materials guarantees consistent colouring, improving the visual attractiveness of plastic goods.


2. Coatings and Inks for Printing
The dye, which gives solvent-based ink formulations their deep yellow hues, is a crucial component of printing inks. Additionally, it is utilised in coatings to improve the aesthetic attractiveness of various surfaces, among which metal & synthetic materials.


3. Identification of Fuel and Lubricant
Fuel labelling is one of the important uses for Solvent Yellow 2. It is employed to identify fuel kinds that are exempt from taxes or to differentiate between various fuel grades. Fuel blends may be easily identified thanks to its vibrant colouring.


4. Dyeing Leather and Textiles
Solvent Yellow 2 is used in the leather and textile industries to add vivid yellow hues. It is a desirable option in several dyeing processes because it adheres well to leather and fabric materials.

 

Regulatory Aspects

Regulations governing the use of colours such as Solvent Yellow 2 in consumer goods vary by area. Adherence to industry norms is necessary to guarantee appropriate use within allowable bounds.

 

In Conclusion

Because of its versatility and efficient colouring capabilities, solvent yellow 2 is still a significant dye in many different sectors. It remains a major asset for industrial applications because to its frequent utilisation among plastics, printing, fuel marking, & textiles.