| 摘要 |
<p>Process for the separation of toluene diisocyanate (TDI) from the residues from its manufacture, with a view to its recovery. …<??>The process is characterised in that the said residues are pretreated with an inert gas in a liquid or supercritical state, if appropriate in the presence of a coextractant chosen from esters, optionally chlorinated aromatic hydrocarbons and chlorinated aliphatic hydrocarbons. …<??>The process is suitable in particular for the treatment of residues which are in the form of tars.</p> |
