For procurement managers and R&D scientists in the chemical industry, sourcing high-quality intermediates is paramount. 1-Naphthylamine-7-sulfonic acid (CAS 119-28-8) stands out as a critical component, particularly within the dyestuffs sector. Understanding its properties, applications, and how to effectively purchase it is key to successful manufacturing operations.

What is 1-Naphthylamine-7-Sulfonic Acid?

This compound, often referred to by its CAS number 119-28-8, is a derivative of naphthalene that features both an amine and a sulfonic acid group. Its chemical structure makes it an indispensable building block for synthesizing a wide array of dyes. Commonly appearing as a light gray crystal, it exhibits a high melting point, typically exceeding 300°C, indicating its thermal stability during chemical reactions.

Key Applications in the Dyestuff Industry

The primary utility of 1-Naphthylamine-7-sulfonic acid lies in its role as a dye intermediate. It is essential for the production of several important dye classes:

  • Direct Dyes: It's a key component in creating direct dyes like Direct Light Fast Blue B2RL and Direct Light Fast Red Brown RTL. These dyes are widely used for coloring cellulosic fibers such as cotton and viscose, offering good lightfastness and easy application.
  • Sulfur Dyes: The synthesis of Sulfur Blue CV relies on 1-Naphthylamine-7-sulfonic acid. Sulfur dyes are known for their affordability, good wash fastness, and deep shades, making them popular for dyeing cotton workwear and denim.
  • Other Dye Types: Its versatility extends to other dye classifications, contributing to the development of dyes with specific fastness properties and color characteristics.

Why Choose a Reliable Supplier?

When looking to buy 1-Naphthylamine-7-sulfonic acid, partnering with a dependable manufacturer or supplier is crucial. A reputable supplier ensures:

  • High Purity: Products with an assay of 98% or higher are essential for consistent reaction yields and the desired quality of the final dye product.
  • Consistent Supply: Reliable manufacturers maintain stable production capacities, ensuring that your procurement needs are met without disruption.
  • Competitive Pricing: Sourcing from manufacturers in China, for example, can offer cost efficiencies, allowing you to manage your production costs effectively.
  • Technical Support: Experienced suppliers can offer valuable technical data and support, aiding your formulation and synthesis processes.

Navigating Your Purchase

For procurement managers seeking to buy 1-Naphthylamine-7-sulfonic acid, focusing on suppliers that clearly list CAS 119-28-8 and provide detailed specifications is vital. When requesting quotes, ensure you specify the required purity and quantity. Understanding the synthesis routes, such as those involving naphthalene sulfonation and subsequent nitration and reduction, highlights the chemical complexity and the need for expert manufacturing.

In conclusion, 1-Naphthylamine-7-sulfonic acid is an indispensable intermediate for the global dyestuff market. By engaging with knowledgeable suppliers and understanding the product's critical role, businesses can secure a vital raw material that drives color innovation and product quality.