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 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.
申请公布号
WO2015105686(A1)
申请公布日期
2015.07.16
申请号
WO2014US72195
申请日期
2014.12.23
申请人
E. I. DU PONT DE NEMOURS AND COMPANY
发明人
HUTCHENSON, KEITH, W.;LIBERT, SHARON ANN;HOWELL, JON LEE;LIANG, XIAN