Sulfolane

Description

Tetramethylene sulfone · CAS 126-33-0 · C4H8O2S. UNII Y5L06AH4G5. Boiling Point: 545 °F at 760 mmHg (USCG, 1999); Boiling Point: 285 °C; Boiling Point: 285 °C @760 [mm Hg].

Identification

CAS Registry Number	126-33-0
PubChem CID	31347
Molecular formula	C4H8O2S
IUPAC name	thiolane 1,1-dioxide
UNII (FDA)	Y5L06AH4G5

Computed Descriptors

Molecular Weight	120.17
XLogP3	-0.8
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	0
Exact Mass	120.02450067
Monoisotopic Mass	120.02450067
Topological Polar Surface Area	42.5
Heavy Atom Count	7
Formal Charge	0

Physical & Chemical Properties

Boiling Point	545 °F at 760 mmHg (USCG, 1999)
Boiling Point	285 °C
Boiling Point	285 °C @760 [mm Hg]
Melting Point	79 °F (USCG, 1999)
Melting Point	27.4-27.8 °C
Flash Point	330 °F (USCG, 1999)
Flash Point	177 °C (350 °F) (OPEN CUP)
Density	1.2606 at 30 °C/4 °C
Density	1.261 @25 °C
Vapor Pressure	0.0062 [mmHg]

Physical description & handling notes

• Sulfolane is a colorless oily liquid with a weak oily odor. Solidifies (freezing point is 79 °F) and sinks on first contact with water, then mixes with water. (USCG, 1999)
• Liquid; Other Solid
• Liquid; mp = 27.4-27.8 deg C; [Merck Index] White solid; [HSDB] Colorless liquid; mp = 26 deg C; [CAMEO] Colorless solid; mp = 27 deg C; [SIDS UNEP] Colorless crystalline solid; mp = 25-28 deg C; [Alfa Aesar MSDS]
• White or creamy white, crystalline powder
• Odorless
• Slightly bitter taste

GHS Hazard Classification

Reported hazard statements	H302, H360 (22.7%), H320, H361

Documented Uses

• Used as a solvent (aromatics extraction and polymerization), plasticizer, curing agent (epoxy resins) and therapeutic (antibacterial, convulsant, and radiation-protective agent); Also used for acid gas purification, fractionation (wood tars, tall oil, and other fatty acids), and textile finishing; [HSDB] Used in electronic applications, pharmaceutical manufacturing (solvent), jet printing inks (solvent), and medicines (believed to exist only in patent literature); [SIDS UNEP]
• Semiconductor Manufacturing [Category: Industry]
• Textiles (Printing, Dyeing, or Finishing) [Category: Industry]
• Selective solvent for liquid-vapor extractions.
• Solvent for aromatics extraction; for acid gas purification.
• Extraction of aromatic hydrocarbons from oil refinery streams; polymerization solvent; plasticizer.

Synonyms

SULFOLANE; 126-33-0; Tetrahydrothiophene 1,1-dioxide; Tetramethylene sulfone; Sulfolan; 1,1-Dioxothiolan; Sulpholane; Thiophene, tetrahydro-, 1,1-dioxide; thiolane 1,1-dioxide; Sulfalone; Sulphoxaline; Dioxothiolan; Thiophan sulfone; Bondelane A; Bondolane A; Thiophane dioxide

Frequently Asked Questions

What are the CAS number and molecular formula of Tetramethylene sulfone?

CAS 126-33-0; molecular formula C4H8O2S; molecular weight — g/mol.

What other names is Tetramethylene sulfone known by?

SULFOLANE, 126-33-0, Tetrahydrothiophene 1,1-dioxide, Tetramethylene sulfone, Sulfolan, 1,1-Dioxothiolan.

Is Tetramethylene sulfone classified as hazardous?

Hazard statements reported: H302, H360, H320, H361.

What are the key physical properties of Tetramethylene sulfone?

Boiling Point: 545 °F at 760 mmHg (USCG, 1999); Boiling Point: 285 °C; Boiling Point: 285 °C @760 [mm Hg]; Melting Point: 79 °F (USCG, 1999).

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.