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Recovery of perfluorinated polyether oils from grease matrices incorporating extraction aids by carbon dioxide extraction
Recovery of perfluorinated polyether oils from grease matrices incorporating extraction aids by carbon dioxide extraction
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机译:通过二氧化碳萃取从含萃取助剂的油脂基质中回收全氟化聚醚油
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摘要
This disclosure relates to a process for extracting a perfluoropolyether. The process involves: (a) contacting a solvent comprising a liquid or supercritical carbon dioxide with a lubricating grease comprising a thickener, an extraction aid material, and the perfluoropolyether in an extraction zone to form an extraction solution comprising an extracted perfluoropolyether; and (b) recovering the extracted perfluoropolyether from the extraction solution; wherein the recovered extracted perfluoropolyether comprises no more than about 2 wt % of the thickener.
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