| 摘要 |
<p>Organic sulfur is removed from coal by extraction with a water/methanol/carbon dioxide mixture under supercritical conditions of temperature and pressure. The preferred solvent used for extraction has the following composition (expressed as a mole fraction): carbon dioxide: 0 - 0.30; methanol: 0.20 - 0.70; water: 0.20 - 0.70. Operations may be carried out in a single stage using a solvent of the above composition, or in plural stages using solvents having successively higher critical temperatures, wherein the overall molar quantities are in accordance with the mole fractions given above. This method results in more efficient organic sulfur removal than prior methods, making use of high sulfur fuels possible.</p> |
