Nylon extraction from commingled materials
US8071656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 2009 |
| Grant date | Dec 6, 2011 |
| Priority date | — |
| Expiry date | Mar 20, 2030 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.