Iron-based Catalyst MethodThere are few reports on the research on the preparation mechanism of hydroxypropyl acrylate at home and abroad.Scholars have explored the reaction mechanism of acrylic acid with propylene oxide in the presence of ferric ions using ultraviolet spectroscopy, infrared spectroscopy, and nuclear magnetic resonance. During the reaction, acrylic acid, ferric ions, and propylene oxide will form a complex, which is very unstable and has catalytic activity itself, ultimately generating hydroxypropyl acrylate. Iron-based catalysts mainly include ferric chloride, ferric sulfate, and ferric hydroxide.The synthesis of hydroxypropyl acrylate using iron-based catalysts produces many by-products with high contents and deep colors, affecting the color of the product. However, they are solid and easy to separate from the reaction solution, which is beneficial for further purification of the reaction solution. In practical applications, they will be considered for compounding with other catalysts to improve their catalytic performance.

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