Diethylaluminum chloride is widely used as a catalyst in the polymerization of olefins, such as ethylene and propylene, to produce polyethylene and polypropylene. It is also employed as a co-catalyst in Ziegler-Natta polymerization processes, which are essential for manufacturing plastics and synthetic rubbers. Additionally, it serves as an alkylating agent in organic synthesis, facilitating the introduction of ethyl groups into various organic compounds. In the production of specialty chemicals, it is utilized for the synthesis of organoaluminum compounds. Its role in the chemical industry is crucial for developing high-performance materials and advanced chemical products.