Overview
Sulfolane is a cyclic sulfone compound first commercialized in the 1960s by Shell under the trade name Sulfolane. Its unique combination of chemical stability and solvent power has made it a workhorse in industrial applications. As a dipolar aprotic solvent, sulfolane demonstrates exceptional performance in processes requiring selective solubility. The compound's rigid ring structure contributes to its thermal stability, allowing use in high-temperature applications where other solvents would degrade.
Physical and Chemical Properties
With a dielectric constant of 43, sulfolane exhibits strong polarity that enables it to dissolve both polar and non-polar compounds. This bifunctional solvation capability stems from its sulfone group (polar) and hydrocarbon moiety (non-polar). The chemical shows remarkable thermal stability, maintaining integrity up to 220°C without decomposition. Its low vapor pressure (0.006 mmHg at 20°C) reduces evaporative losses during industrial processes. The compound forms azeotropes with water and some hydrocarbons, a property utilized in separation processes.
Main Applications
In natural gas processing, sulfolane is the solvent of choice in the Sulfinol process for removing acidic gases (H2S and CO2) due to its selective absorption characteristics. The electronics industry uses high-purity grades for photoresist stripping and wafer cleaning. Pharmaceutical manufacturers employ sulfolane as a reaction medium for polar reactions, particularly where traditional solvents like DMF are problematic. Emerging applications include lithium battery electrolytes and polymer processing where its thermal stability is advantageous.
Safety and Storage
While sulfolane has low acute toxicity (LD50 oral rat = 1,500-2,000 mg/kg), prolonged skin contact can cause irritation and dermatitis. Proper ventilation and nitrile gloves are recommended when handling. Storage requires corrosion-resistant containers (stainless steel or polyethylene) with nitrogen padding recommended for long-term storage to prevent moisture absorption. The solvent is not flammable (flash point >160°C) but may decompose at temperatures above 220°C, releasing sulfur oxides.
B2B Procurement Guide
Industrial buyers should specify purity requirements (typically 99-99.9%) and water content (often <0.1% for critical applications). Bulk shipments commonly use 200kg drums or isotanks for quantities above 5 metric tons. Technical specifications should include tests for refractive index (1.481-1.483 at 20°C) and acid value (<0.01 mg KOH/g). For gas treatment applications, verify the supplier's experience with Sulfinol-grade formulations containing amine co-solvents.
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