Patent ID: 7659320
Filing Date: 2010-02-09
Classification: C08J,Y02W

Abstract:
1. A method for recovering nylon from a waste material comprising nylon, comprising: contacting the waste material comprising nylon with an alkanol-containing solvent at an elevated temperature between 130° C. and 155° C. and at a pressure higher than an equilibrium vapor pressure of the alkanol-containing solvent at the elevated temperature, and between 400 psig to 600 psig, and maintaining the pressure for a dissolution time sufficient to dissolve the nylon, thereby dissolving the nylon in the alkanol-containing solvent, wherein the combination of the pressure, temperature and the dissolution time provide a desired yield of nylon of at least 82%; removing the alkanol-containing solvent containing dissolved nylon from any undissolved solids; decreasing the temperature of the alkanol-containing solvent containing dissolved nylon to between 120° C. and 130° C. to precipitate dissolved nylon to generate precipitated nylon in remaining solution; and separating the precipitated nylon from the remaining solution.