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cas no 139 07 1

Understanding the Importance of CAS No. 139-07-1

Chemical Abstracts Service (CAS) numbers are unique numerical identifiers assigned to chemical substances. They play a crucial role in scientific communication, research, and regulatory compliance. Among the vast array of substances cataloged by CAS, the number 139-07-1 refers to a compound known as benzenesulfonic acid, specifically p-toluenesulfonic acid (PTSA). This article delves into the significance, applications, and safety considerations surrounding CAS No. 139-07-1.

What is p-Toluenesulfonic Acid?

p-Toluenesulfonic acid is an aromatic sulfonic acid derived from toluene. It is a colorless to pale yellow liquid that is highly soluble in water and organic solvents. The chemical formula for p-toluenesulfonic acid is C7H8O3S, and it features a sulfonic acid group (-SO3H) attached to a toluene ring. The presence of the sulfonic acid makes it a strong acid, with properties that are essential for various industrial applications.

Applications of p-Toluenesulfonic Acid

1. Catalyst in Organic Synthesis One of the primary uses of p-toluenesulfonic acid is as a catalyst in organic reactions. It is particularly effective in promoting esterification and etherification processes, which are fundamental in the production of several chemical compounds.

2. Chemical Intermediate p-Toluenesulfonic acid serves as an important intermediate in the synthesis of dyes, pharmaceuticals, and agrochemicals. Its ability to enhance reactivity makes it a valuable building block in various chemical reactions.

cas no 139 07 1

3. pH Adjuster In laboratory settings, p-toluenesulfonic acid is often used to adjust the pH of solutions. Its strong acidic nature allows scientists to fine-tune the acidity of reaction mixtures, which is critical for achieving desired outcomes in experiments.

4. Surfactants The compound is also utilized in the production of surfactants, which are key ingredients in detergents, pesticides, and personal care products. Its amphiphilic properties help to reduce surface tension, improving the efficacy of these products.

Safety Considerations

While p-toluenesulfonic acid is widely used in various industries, handling it requires caution due to its corrosive nature. Direct contact can cause skin and eye irritation, so appropriate personal protective equipment (PPE), such as gloves and goggles, should be worn during use. It is also essential to work in a well-ventilated area or under a fume hood to minimize inhalation risks.

In terms of environmental safety, p-toluenesulfonic acid is classified as hazardous. Appropriate disposal methods must be followed to avoid contaminating water sources and harming aquatic life. Regulatory compliance with local and international guidelines is critical in managing the risks associated with its use.

Conclusion

In summary, CAS No. 139-07-1, representing p-toluenesulfonic acid, is more than just a number; it symbolizes a vital chemical that contributes significantly to various industrial and laboratory processes. Understanding its properties, applications, and safety measures is essential for anyone involved in chemistry or related fields. As industries continue to seek efficient and effective chemical solutions, the role of p-toluenesulfonic acid remains significant, highlighting the importance of chemistry in our everyday lives.

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