Sulfolane (sulfolane) CAS 126-33-0, chemical formula C ₄ H ₈ O ₂ S, is a highly stable polar non proton solvent widely used in aromatic hydrocarbon extraction and gas purification.

Core identification and physicochemical properties
-Chinese name: sulfolane (alias: tetrahydrothiophene-1,1-dioxide, tetramethylene sulfone)
-English name: Sulfolane (Tetramethylene sulfone)
-Molecular structure: Five membered cyclic sulfone compounds (2,3,4,5-Tetrahydrophenophene-1,1-dioxade)
-Molecular weight: 120.17 g/mol
-Appearance: Colorless and transparent liquid at room temperature (melting point about 27-28 ℃), almost odorless or with a slight characteristic odor
-Key parameters: Boiling point of 285-287 ℃, density of 1.261 g/mL (25 ℃), flash point of approximately 177 ℃, miscible with water and various organic solvents
-Stability: Excellent thermal and chemical stability, low solubility in paraffin hydrocarbons, high selectivity for aromatic hydrocarbons

Main Preparation and Application
1. Synthesis route: In industry, it is mainly produced by Diels Alder reaction between butadiene and sulfur dioxide to produce sulfolane, which is then reduced by hydrogenation.
2. Core applications:
-Petrochemical industry: solvent for liquid-liquid extraction and separation of aromatic hydrocarbons (benzene, toluene, xylene).
-Gas purification: Removing acidic components such as hydrogen sulfide and mercaptan from natural gas and refinery gas.
-Polymer industry: spinning of polymers (such as polyacrylonitrile), casting solvents, and rubber dissolution.
-Other fields: textile printing and dyeing auxiliaries, electrochemical electrolytes, and organic synthesis reaction media.

Safety and Storage
-Toxicity characteristics: low toxicity, high acute oral LD50, but may cause irritation upon contact with skin or eyes; Long term inhalation of high concentration vapors can cause discomfort in the central nervous system.
-Operation protection: Wear protective goggles and gloves to avoid contact with strong oxidants and strong acids.
-Storage conditions: Seal and store in a cool, dry, and well ventilated place (recommended<30 ℃) to prevent moisture absorption and high temperature decomposition that may produce sulfur dioxide.

Products :

CAS 126-33-0 | Sulfolane 99.5% C4H8O2S (Sulpholane)
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