| 摘要 |
<p>A process and apparatus for separating and recovering polystyrene from polystyrene containing material wherein the polystyrene containing material is contacted with liquid sulfur dioxide wherein the polystyrene is dissolved and the system polystyrene-sulfur dioxide forms two phases, an upper phase which contains the polystyrene and a lower phase which contains the sulfur dioxide solvent which is practically free from polystyrene and which can be reused in the process, the polystyrene is recovered from the upper polystyrene containing phase by boiling off the sulfur dioxide, which if desired is returned to the process, optionally after removing low molecular portions of polystyrenes.</p> |
