Acid Yellow 17 (CAS 6359-98-4) is more than just a colorant; it's a complex chemical compound with specific properties that dictate its performance in various industrial applications. For those looking to purchase this vital dye intermediate, understanding its chemical makeup and the manufacturing nuances is crucial for ensuring optimal results and cost-effectiveness. As a leading manufacturer and supplier, NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing insights into the chemistry of Acid Yellow 17.

Molecular Structure and Chemical Properties

Acid Yellow 17 is an anionic azo dye. Its molecular formula, C16H10Cl2N4Na2O7S2, and molecular weight of 551.29 g/mol reveal a complex structure featuring sulfonate groups (SO3H), which impart water solubility and anionic character, and azo linkages (-N=N-), responsible for its color. These sulfonate groups are key to its classification as an 'acid dye.' In acidic dyebaths, the fibers (like wool, silk, and nylon) develop positive charges on their amino groups (-NH2). The anionic dye then forms strong ionic bonds with these positively charged sites on the fiber. This electrostatic attraction is the primary mechanism by which Acid Yellow 17 fixes to the material.

The specific structure of Acid Yellow 17 contributes to its characteristic bright yellow appearance. Its absorption spectrum, with key peaks around 194 nm, 223 nm, 255 nm, and a significant one at 403 nm, dictates the wavelengths of light it absorbs and reflects, resulting in the observed yellow color. The presence of chlorine atoms and sulfonate groups also influences its fastness properties and reactivity.

Manufacturing and Quality Control

The quality of Acid Yellow 17, whether purchased for textile, leather, or paper applications, is directly tied to its manufacturing process and rigorous quality control. As a chemical manufacturer in China, NINGBO INNO PHARMCHEM CO.,LTD. employs advanced synthesis techniques and stringent quality checks to ensure:

  • Purity: Minimizing impurities, such as residual salts or unreacted precursors, is critical. High purity leads to better solubility, consistent shade, and reduced risk of unwanted side reactions.
  • Strength and Shade Consistency: Precise control over the reaction parameters ensures that each batch of Acid Yellow 17 meets the specified strength (e.g., 120%±＜2%) and shade (e.g., CMC2:1 ≤0.5). This consistency is vital for industrial users who rely on predictable results.
  • Physical Characteristics: Properties like low moisture content (≤8%) and minimal insolubles (≤0.2%) are monitored to ensure the product performs optimally in dyeing processes.

Understanding the chemistry behind Acid Yellow 17 empowers you to make informed purchasing decisions. When you choose to buy from a manufacturer like NINGBO INNO PHARMCHEM CO.,LTD., you are investing in a product engineered for performance, backed by a commitment to quality and consistency.