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Sulfolane CAS 126-33-0 REACH Certificate
Sulfolane is supplied as a stabilized, low-melting-point (~9°C) liquid for ease of handling. It is an excellent selective solvent for gas purification and extraction.
● Dry point: 286.1℃ (559.1 K)
● Isopropyl sulfolane aether: < 0.05%
● Freezing point: 27℃ (300 K)
● Ash content: 0.001% m/m
● Colour - Hazen: 50
● Flash point (Cleveland open cup): 177℃ (450 K)
Typical Properties of High Purity Sulfolane
| CAS registry number | 126-33-0 | COLOUR - Klett | 40 |
| Molecular formula | C4H8O2S | pH | 4.9 |
| Molecular weight | 120 | Refractive index n30D | 1.4812 |
| Appearance | Very pale straw solid | Water content | 0.09% m/m |
| Density at 30℃ | 1.260 g/ml | Sulphur dioxide content | 115 ppm |
| Initial boiling point | 281.1℃ (554.1 K) | Sulfolene-2 content | < 0.05% |
| Dry point | 286.1℃ (559.1 K) | Isopropyl sulfolane aether | < 0.05% |
| Freezing point | 27℃ (300 K) | Ash content | 0.001% m/m |
| Colour - Hazen | 50 | Flash point (Cleveland open cup) | 177℃ (450 K) |
Typical properties of Aqueous Sulfolane
For ease of handling, SULFOLANE is normally supplied containing ~3% water, as this mixture is fluid at 10°C (see graph opposite). The typical properties of this product are listed below
| Water content | ~ 3% | Melting point | ~ 9℃ (282 K) |
| Monoethanolamine content | 200-250 ppm | pH | 8 |
Other properties
| Vapour pressure | @ 150℃ | 14.53 mmHg |
| @ 200℃ | 85.23 mmHg | |
| @ 250℃ | 333.7 mmHg | |
| Critical temperature | 528℃ (801 K) | |
| Critical pressure | 52.2 Atmospheres | |
| Dipole moment (benzene) | 4.69 Debyes | |
| Dielectric constant (30℃) | 44 | |
Sulfolane has exceptional chemical and thermal stability. It only decomposes at temperatures above 220°C, and then only to give off sulphur dioxide. Sulfolane, therefore, has to be distilled under reduced pressure. The following dissociation rates have been observed for Sulfolane in glass with inert gas or air bubbling (decomposition was measured by the generation of sulphur dioxide).
| Bubbled Gas | Temperature (℃) | Rate of Decomposition (% per hour) |
| Nitrogen | 200 | 0.002 |
| Nitrogen | 220 | 0.010 |
| Nitrogen | 23 | 0.02 |
| Carbon Dioxide | 200 | 0.002 |
| Air | 200 | 0.009 |
Melting point determinations on Sulfolane samples after prolonged exposures (150- 500 hours) under the above conditions showed that very little reduction in purity occurred, although considerable discolouration was observed. Tests on Sulfolane (with and without small amounts of water and hydrocarbon) and carbon steel at 200°C showed that negligible corrosion occurred.
Packaging and storage
✦ 200L/250kg new galvanized drum with nitrogen blanket
✦ ISO tank with nitrogen blanket
✦ IBC packing with nitrogen blanket
✦ Tank truck with nitrogen blanket
✦ Small size plastic drums for special requests
✦ As required
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