VERFAHREN ZUR HERSTELLUNG VON ISOCYANATEN DURCH THERMISCHE SPALTUNG VON URETHANEN

摘要

A process for the pyrolysis of mono-, di-, and polyurethanes to the corresponding mono-, di-, and polyisocyanates wherein the urethane to be cleaved is heated under pressure and sprayed through a nozzle into a pyrolysis chamber maintained at reduced pressure. The isocyanate and alcohol cleavage products are separated by fractional condensation.