Metanilic Acid, identified by CAS number 121-47-1, is a chemical compound of significant industrial value, primarily recognized for its role as a key intermediate in the synthesis of dyes and its growing importance in the pharmaceutical sector. This detailed examination will explore its fundamental properties, diverse applications, and practical guidance for sourcing this essential chemical.

Chemical Properties and Characteristics:
Metanilic acid (C6H7NO3S) is typically presented as a white powder. It exhibits moderate solubility in water, readily dissolving in alkaline solutions and concentrated hydrochloric acid, while showing limited solubility in organic solvents like ethanol and ether. Its purity is often specified with an assay of 98% or higher, ensuring its efficacy in downstream chemical processes. Common packaging involves 25 kg drums, facilitating safe handling and storage.

Key Applications:
The primary industrial application of metanilic acid is its function as a dye intermediate. It is instrumental in the creation of a wide array of dyestuffs, including:

  • Acid Dyes: Used for dyeing wool, silk, and nylon, providing bright and wash-fast colors.
  • Reactive Dyes: Known for forming covalent bonds with fibers, offering excellent colorfastness, particularly on cotton.
  • Azo Dyes: A vast class of dyes synthesized via diazotization and coupling reactions, where metanilic acid plays a crucial role as a diazo component.
  • Sulfur Dyes: Employed for dyeing cotton and other cellulosic fibers, typically producing darker shades with good wash fastness.
Beyond its extensive use in colorants, metanilic acid also serves as a vital intermediate in the pharmaceutical industry. It acts as a precursor in the synthesis of various active pharmaceutical ingredients (APIs) and other chemical entities crucial for drug development. This dual applicability makes it a highly sought-after compound across multiple industries.

Sourcing Metanilic Acid:
For businesses looking to buy metanilic acid, identifying reliable suppliers and manufacturers is paramount. Key sourcing considerations include:

  • Supplier Reputation: Look for established manufacturers and suppliers with a proven track record in chemical production and export, particularly those based in regions like China, which are major global producers.
  • Product Quality: Ensure suppliers provide detailed specifications, including assay (98%+), appearance, and solubility data. Requesting Certificates of Analysis (COA) and Material Safety Data Sheets (MSDS) is standard practice.
  • Pricing and Terms: Compare pricing based on quantity and negotiate favorable terms, considering minimum order quantities (typically 25kg).
  • Technical Support: Engage with suppliers who offer technical assistance and readily provide necessary product documentation.

In conclusion, Metanilic Acid (CAS 121-47-1) is a cornerstone chemical intermediate whose properties enable a spectrum of vibrant colors and contribute to vital pharmaceutical applications. Strategic sourcing from reputable metanilic acid manufacturers and suppliers ensures the quality and consistency required for success in today's competitive industrial landscape.