The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 06, 2011
Filed:
Mar. 03, 2009
Brian J. Waibel, Kennett Square, PA (US);
Hans Schonemann, Newburyport, MA (US);
Val Krukonis, Lexington, MA (US);
David J. Lawrence, Newark, DE (US);
Joseph N. Caulfield, Aston, PA (US);
Brian J. Waibel, Kennett Square, PA (US);
Hans Schonemann, Newburyport, MA (US);
Val Krukonis, Lexington, MA (US);
David J. Lawrence, Newark, DE (US);
Joseph N. Caulfield, Aston, PA (US);
DynaSep LLC, Newark, DE (US);
Abstract
The present invention provides energetically and economically efficient methods for separating polyamide polymer(s) from commingled materials. The methods generally involve precipitating a polyamide polymer dissolved in a solvent (e.g., formic acid) using dimethyl ether (DME) as an antisolvent. The methods comprise dissolving the polyamide polymer in a solvent that (i) selectively dissolves the polyamide polymer relative to the other materials and (ii) has a higher solubility for DME relative to the polyamide polymer; and then contacting the mixture of the solvent with the dissolved polyamide polymer with DME, thereby precipitating the polyamide polymer.