Nylon extraction from commingled materials

Details Nylon extraction from commingled materials Nylon extraction from commingled materials

2009-03-03

2011-12-06

Seidleck, James J (Department: 1765)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

C521S040000, C521S049000, C521S049500, C528S494000, C528S495000, C528S50200C, C528S310000, C528S328000, C528S338000, C528S350000, C528S367000, C523S332000, C523S343000

Reexamination Certificate

active

08071656

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.

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