Abstract

This article provides a comprehensive guide to Acid Red 122, a widely used azo dye with the CAS number 12234-98-9. It delves into the properties, applications, safety considerations, and regulatory aspects of this dye, offering insights into its role in various industries. The guide aims to unlock the secrets behind Acid Red 122, providing a detailed understanding of its characteristics and uses.

Introduction to Acid Red 122

Acid Red 122, also known as C.I. Acid Red 122, is a synthetic azo dye that is extensively used in the textile, pharmaceutical, and food industries. It is characterized by its vibrant red color and is known for its excellent colorfastness and stability. This guide aims to explore the various aspects of Acid Red 122, including its chemical structure, synthesis, and applications.

Chemical Structure and Synthesis

Acid Red 122 is a triarylmethane dye with a chemical formula of C_18H_14N_3Na. It is synthesized through the condensation reaction of 4-amino-2-naphthalenecarboxaldehyde with 2,4-dinitrobenzene in the presence of sodium nitrite and sodium hydroxide. The resulting compound is then reduced to yield the final product. The synthesis process requires careful control of reaction conditions to ensure the desired purity and color intensity of the dye.

Properties of Acid Red 122

Acid Red 122 exhibits several distinct properties that make it suitable for various applications. Its vibrant red color is one of its most notable features, providing a strong contrast against white or light-colored backgrounds. Additionally, the dye is known for its excellent fastness to light, heat, and washing, which ensures that the color remains stable over time. The dye also has good solubility in water, making it easy to apply to textiles and other materials.

Applications of Acid Red 122

The versatility of Acid Red 122 makes it a valuable dye in multiple industries. In the textile industry, it is used to dye cotton, silk, and wool, providing vibrant red shades to fabrics. It is also employed in the pharmaceutical industry for the coloring of tablets and capsules. Furthermore, Acid Red 122 finds applications in the food industry, where it is used as a food coloring agent, adding a rich red color to various products.

Safety Considerations

While Acid Red 122 is widely used, it is important to consider its safety profile. The dye is classified as a potential allergen, and prolonged exposure to it can cause skin irritation or allergic reactions. Therefore, proper handling and safety measures are essential when working with this dye. It is also important to note that the dye is not suitable for use in all applications, particularly those involving direct contact with the skin or ingestion.

Regulatory Aspects

The use of Acid Red 122 is regulated by various agencies around the world. In the European Union, the dye is listed under the EU Inventory of Existing Chemical Substances (EINECS), and its use is subject to authorization. Similarly, in the United States, the dye is regulated by the Food and Drug Administration (FDA) and is approved for use in certain food applications. Compliance with these regulations is crucial for manufacturers and users of Acid Red 122.

Conclusion

Unlocking the secrets of Acid Red 122 CAS 12234-98-9: A Comprehensive Guide provides a thorough examination of this versatile azo dye. From its chemical structure and synthesis to its properties, applications, safety considerations, and regulatory aspects, this guide offers a comprehensive understanding of Acid Red 122. By exploring these various facets, readers can gain insights into the role of this dye in different industries and make informed decisions regarding its use.

Keywords: Acid Red 122, CAS 12234-98-9, azo dye, textile industry, pharmaceutical industry, food coloring, safety considerations, regulatory aspects.