For professionals in the chemical industry, a thorough understanding of chemical intermediates' specifications and manufacturing processes is crucial for successful procurement and application. 1,3-Dicyanobenzene (CAS 626-17-5), also known as isophthalonitrile, is a prime example of such a critical compound, valued for its purity and role in synthesizing vital end products. This article delves into the key specifications of 1,3-Dicyanobenzene and provides insights into its industrial production methods.

Key Chemical and Physical Specifications

Manufacturers and suppliers of 1,3-Dicyanobenzene typically provide a range of specifications to assure quality and suitability for various industrial applications. These often include:

  • Appearance: Typically described as an off-white crystal or powder.
  • Assay (Purity): A minimum purity level is crucial. Commonly, an assay of ≥99% (GC) is guaranteed, indicating a high degree of chemical purity.
  • Melting Point: The specified melting range, often 163-165°C, is a key indicator of product quality and identity.
  • Moisture Content: Low moisture content, typically ≤0.5%, is essential for product stability and preventing undesirable reactions during storage and processing.
  • Impurities: Specifications may also detail limits for specific impurities, such as mononitrile or amide content, to ensure consistent performance in downstream synthesis.

For buyers looking to purchase 1,3-Dicyanobenzene, requesting a Certificate of Analysis (COA) from the supplier is standard practice to verify these specifications. Working with a reputable manufacturer in China ensures that these quality benchmarks are met.

Industrial Synthesis of 1,3-Dicyanobenzene

The industrial production of 1,3-Dicyanobenzene typically involves the ammoxidation of meta-xylene. This process uses m-xylene, ammonia, and oxygen (from air) in the presence of a heterogeneous catalyst at elevated temperatures. The reaction selectively converts the methyl groups of m-xylene into nitrile groups, yielding 1,3-Dicyanobenzene.

The overall reaction can be simplified as:

C6H4(CH3)2 + 2 NH3 + 3 O2 → C6H4(CN)2 + 6 H2O

This catalytic process is favored for its efficiency in producing high-purity 1,3-Dicyanobenzene on a large scale. Process optimization, including catalyst selection, reaction temperature, pressure, and reactant ratios, is critical for maximizing yield and minimizing byproduct formation. Post-reaction purification steps, such as crystallization, are employed to achieve the required product quality.

Understanding these specifications and manufacturing insights empowers procurement managers and R&D professionals to make informed decisions when sourcing 1,3-Dicyanobenzene. Partnering with experienced Chinese manufacturers provides access to this essential intermediate at competitive prices, supporting the production of critical agrochemicals and advanced materials.