Patent ID: 7319113
Filing Date: 2008-01-15
Classification: B29B,B29K,C08G,C08J,Y02W

Abstract:
1. A process for recovering polyamide material having an initial average molecular weight from post-industrial and post-consumer products containing -polyamide material and insoluble materials, said process comprising the steps of: (a) contacting said the post-industrial and said post-consumer products with a suitable solvent in a reactor; (b) dissolving and partially depolymerizing said polyamide material in the said suitable solvent to form a solution by operating said the reactor at a predetermined temperature and pressure and for a time sufficient to decrease the average molecular weight of the partially depolymerized polyamide to between about 25% to about 90% of the initial average molecular weight of said polyamide material; (c) separating said insoluble material from said solution using filtration to produce a filtrate solution; (d) recovering the partially depolymerized polyamide from the filtrate solution of step (c) by adding an additive to the filtrate solution to precipitate the partially depolymerized polyamide material; (e) separating the precipitated partially depolymerized polyamide from the filtrate solution; and (f) repolymerizing the precipitated, partially depolymerized polyamide.