Phthalic anhydride (PA) plays a vital role in the production of key materials such as plasticizers, pigments, dyes, and resins. Its importance is particularly evident in the manufacturing of unsaturated polyester resins (UPR), commonly used in fiberglass-reinforced plastics. There is a significant demand for PA in the pigments and dyes sector, driven by the world’s substantial production of organic pigments like phthalocyanine blue, green, and high-performance pigments. Moreover, PA finds application in the production of herbicides, insecticides, insect repellents, fire retardants, polyester polyols, and rubber scorch inhibitors. With over forty years of experience, TCL has emerged as a leading PA manufacturer, contributing to the progress of various industries that rely on this essential compound.