Diethylene glycol, with the chemical formula C4H10O3 and CAS number 111-46-6, is a colorless, odorless, clear, hygroscopic viscous liquid with a sweet, pungent taste. It is non-corrosive and of low toxicity. Diethylene glycol can be used as a gas dehydration agent, aromatic hydrocarbon extraction solvent, and a key raw material in polyurethane synthesis, as well as a solvent and humectant. It can also serve as an intermediate in the synthesis of other organic compounds, fragrances, and pharmaceuticals.