Abstract: 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.
Type:
Grant
Filed:
December 23, 2014
Date of Patent:
October 9, 2018
Assignee:
THE CHEMOURS COMPANY FC, LLC
Inventors:
Keith W. Hutchenson, Sharon Ann Libert, Jon Lee Howell, Xian Liang
Abstract: 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.
Type:
Grant
Filed:
December 23, 2014
Date of Patent:
October 2, 2018
Assignee:
THE CHEMOURS COMPANY FC, LLC
Inventors:
Keith W Hutchenson, Sharon Ann Libert, Jon Lee Howell, Xian Liang, Val Krukonis, Hans Schonemann
Abstract: A method for producing, in a few simple steps, a specific optically active aldehyde represented by the general formula (1), in which * is an asymmetric carbon atom, includes asymmetrically isomerizing a specific allyl alcohol represented by the general formula (2) in the presence of a ruthenium complex and a base.