Sulfolane W, also referred to as tetramethylene sulfone, is a distinctive grade of sulfolane characterized by its 3% water content by weight. This small addition of water significantly lowers the solvent's freezing point, facilitating more manageable transport and storage, especially for those industrial applications where the utmost purity is not a critical requirement. As a highly dipolar, low-viscosity, aprotic organosulfur solvent, sulfolane effectively dissolves a wide range of polar compounds. Additionally, its low toxicity and minimal skin penetration risks enhance its safety profile in various chemical processes. Notably, sulfolane remains thermally stable at elevated temperatures, ensuring consistent performance in demanding conditions. Sulfolane W is extensively utilized in the BTX extraction process, effectively separating aromatic hydrocarbons, such as benzene, toluene, and xylene, from refinery reformate. It also serves as an efficient foam inhibitor within the process of removing mercaptans and other organic sulfur compounds.