For professionals in chemical research and procurement, a thorough understanding of chemical properties and synthesis pathways is fundamental to successful project execution. Sodium p-toluenesulfonate (CAS 657-84-1), a white crystalline powder, is a chemical compound with a well-defined set of properties that make it valuable across various industrial sectors. This article explores its key characteristics and common synthesis routes, providing essential knowledge for those looking to buy or utilize this compound.

Chemical and Physical Properties

Sodium p-toluenesulfonate, with the molecular formula C7H7NaO3S, is characterized by its white crystalline appearance. Its most significant physical property is its high water solubility, a trait that makes it highly useful in aqueous formulations and reactions. Chemically, it is the sodium salt of p-toluenesulfonic acid, a strong organic acid. This sulfonate salt structure imparts it with ionic characteristics and makes it a stable compound under standard conditions.

Key properties often listed by suppliers include:

  • Appearance: White crystal or crystalline powder.
  • Solubility: Highly soluble in water, and typically soluble in polar organic solvents.
  • Purity: Available in various grades, commonly with assays ranging from 85% to over 98%, depending on the manufacturer and intended application.
  • Melting Point: Generally reported as greater than 300°C, indicating high thermal stability.
  • pH of a 1% solution: Typically neutral to slightly alkaline, around 7-8.

These properties are crucial for R&D scientists to consider when designing experiments or developing new products. Understanding these characteristics helps in selecting the appropriate grade and handling procedures.

Synthesis of Sodium p-Toluenesulfonate

The production of Sodium p-toluenesulfonate typically involves a straightforward neutralization reaction. The primary method is the reaction of p-toluenesulfonic acid with a sodium base, such as sodium hydroxide or sodium carbonate. The general reaction is as follows:

CH3C6H4SO3H (p-Toluenesulfonic acid) + NaOH (Sodium Hydroxide) → CH3C6H4SO3Na (Sodium p-toluenesulfonate) + H2O

This process is relatively simple and can be carried out efficiently in industrial settings. The resulting product is then purified, dried, and packaged according to industry standards. For procurement managers, knowing the synthesis route can provide insights into the potential impurities and quality variations that might exist between different suppliers. When you plan to buy Sodium p-toluenesulfonate, it's beneficial to inquire about the synthesis method and quality control measures employed by the manufacturer.

By understanding these fundamental aspects of Sodium p-toluenesulfonate, professionals can make informed decisions regarding its procurement and application, ensuring optimal performance in their respective fields.