METHOD FOR SEPARATION OF TOLUENE DIISOCYANATE PRESENT IN RESIDUE FROM PROCESS OF MANUFACTURING TOLUENE DIISOCYANATE

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.