VERFAHREN ZUR TRENNUNG VON TOLUOLDIISOCYANAT AUS SEINEN HERSTELLUNGSRUECKSTAENDEN.

摘要

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.