公开(公告)号：DE2452805A1

公开(公告)日：1976-05-20

申请号：DE2452805

申请日：1974-11-07

Applicant: BASF AG

Inventor： HETZEL ECKHARD DIPL ING ,  KOEHLER WALDEMAR DIPL CHEM DR ,  VOCK GEORG FRIEDRICH DIPL ING ,  BITTLER ROLF DIPL CHEM DR

IPC: B01D1/00 ,  C07C20060101 ,  C07C263/10 ,  C07C265/12 ,  C07C119/048

Abstract: A process for the separation of residues of toluenediisocyanate production from mixtures containing high boiling residues, toluenediisocyanate and solvent by evaporation in said residue at a minimum of 5 DEG C above the boiling point of the higher boiling of the components consisting of toluenediisocyanate and solvent. The mixture is fed into the central portion of an evaporator equipped with a helical agitator operative to provide a material flow moving centrally downwards and peripherally upwards.