126-33-0 | Sulfolane

Chemical type

• Cyclic sulfone physical solvent

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• Cyclic sulfone solvent

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Key properties

• Moderate selectivity for acid gases
• Regeneration energy of 2.3–2.8 GJ/ton CO₂
• Low corrosivity and volatility
• High thermal stability
• Used in water blends to reduce viscosity

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• High dielectric constant
• Wide electrochemical window (>5.5 V vs Li/Li+)
• High flash point (166 °C)
• Nonflammable
• High viscosity
• Strong coordination ability with Li+
• Low LUMO energy level (prone to reduction on Li surface)

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• Acid gas removal (CO₂/H₂S) from natural gas
• Component in hybrid Sulfinol process with amines

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• Solvent in nonflammable electrolytes for lithium-metal batteries
• Facilitates formation of stable SEI layers in dual-salt systems
• Enhances thermal stability in high-voltage battery applications

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Classification by use

• Physical solvent for aromatic and acid gas extraction
• Solvents in hybrid sweetening units for reduced energy

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• Solvents for advanced battery electrolytes
• Nonflammable solvents in energy storage systems

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1. [Cite:1] Hybrid ionic liquid amine solvents for CO₂ capture from natural gas: a systematic review of techno-economic and environmental performance, Carbon Capture Science & Technology, Volume 18, March 2026, 100549
2. [Cite:2] Lithium nitrate/Lithium bis(oxalate)borate dual-salt in sulfolane as nonflammable electrolyte for stable lithium-metal batteries, International Journal of Electrochemical Science, Volume 21, Issue 1, January 2026, 101267