<p>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.</p>
申请公布号
EP2403902(A1)
申请公布日期
2012.01.11
申请号
EP20090789598
申请日期
2009.04.16
申请人
DYNASEP LLC
发明人
WAIBEL, BRIAN, J.;SCHONEMANN, HANS;KRUKONIS, VAL;LAWRENCE, DAVID, J.;CAULFIELD, JOSEPH, N.