The Sulfolane is an organic compound with the formula C₄H₈O₂S. The IUPAC name of this chemical is thiolane 1,1-dioxide. With the CAS registry number 126-33-0, it is also named as 2,3,4,5-Tetrahydrothiophene-1,1-dioxide. The product's category is Organics. Besides, it is a colourless crystal.

Physical properties about Sulfolane are: (1)ACD/BCF (pH 5.5): 1; (2)ACD/BCF (pH 7.4): 1; (3)ACD/KOC (pH 5.5): 13.961; (4)ACD/KOC (pH 7.4): 13.961; (5)#H bond acceptors: 2; (6)Polar Surface Area: 42.52 Å²; (7)Index of Refraction: 1.486; (8)Molar Refractivity: 27.337 cm³; (9)Molar Volume: 95.289 cm³; (10)Polarizability: 10.837×10^-24cm³; (11)Surface Tension: 35.61 dyne/cm; (12)Density: 1.261 g/cm³; (13)Flash Point: 170.678 °C; (14)Enthalpy of Vaporization: 50.357 kJ/mol; (15)Boiling Point: 285.568 °C at 760 mmHg; (16)Vapour Pressure: 0.005 mmHg at 25°C.

Preparation: the original method was to first allow butadiene to react with sulfur dioxide. This yields sulfolene, which was then hydrogenated using Raney nickel as a catalyst to give sulfolane.

Uses of Sulfolane: it is widely used as an industrial solvent, especially in the extraction of aromatic hydrocarbons from hydrocarbon mixtures and to purify natural gas. Sulfolane was found to be highly effective in separating high purity aromatic compounds from hydrocarbon mixtures using liquid-liquid extraction. This process is still widely used today in refineries and the petrochemical industry. Because sulfolane is one of the most efficient industrial solvents for purifying aromatics, the process operates at a relatively low solvent-to-feed ratio, making sulfolane relatively cost effective compared to similar-purpose solvents. In addition, it is selective in a range that complements distillation; where sulfolane can't separate two compounds, distillation easily can and vice versa, keeping sulfolane units useful for a wide range of compounds with minimal additional cost.

When you are using this chemical, please be cautious about it as the following:
It is harmful if swallowed. When you are using it, do not breathe gas/fumes/vapour/spray (appropriate wording to be specified by the manufacturer) and avoid contact with eyes.

You can still convert the following datas into molecular structure:
(1)SMILES: C1CCS(=O)(=O)C1
(2)InChI: InChI=1/C4H8O2S/c5-7(6)3-1-2-4-7/h1-4H2
(3)InChIKey: HXJUTPCZVOIRIF-UHFFFAOYAA
(4)Std. InChI: InChI=1S/C4H8O2S/c5-7(6)3-1-2-4-7/h1-4H2
(5)Std. InChIKey: HXJUTPCZVOIRIF-UHFFFAOYSA-N

The toxicity data is as follows: