| 摘要 |
The invention relates to a process for extracting polyester from packaging. In particular, the invention relates to packaging comprising one or more dyes such as black packaging. The claimed process uses a two stage extraction process to convert waste polyester in clean, reusable polyester. The process comprises (a) contacting the fabric with a first solvent system to form a mixture, (b) maintaining the mixture at a first temperature for a first period of time until substantially all of the dye has been dissolved, (c) removing the first solvent system containing the dissolved dye, (d) contacting the remaining mixture with a second solvent system in order to dissolve the polyester, (e) maintaining the remaining mixture at the second temperature for a second period of time until substantially all of the polyester has been dissolved, (f) removing the second solvent system containing the dissolved polyester, and (g) recovering the polyester from the second solvent system. The second temperature is greater than the first temperature when the two solvent systems are the same. The solvents are food grade solvents such as ethyl benzoate. |
