| abstract |
The invention relates to a process for the partial or complete separation of a mixture of substances consisting of hydrogen chloride and phosgene, optionally solvents and possibly low boilers and inerts, as are usually obtained in the production of isocyanates by reacting amines with phosgene, characterized in that initially partial or complete condensation of phosgene, then distillation or stripping in a column to remove the hydrogen chloride from the bottom product phosgene and then washing the top product hydrogen chloride with the process solvent to absorb the phosgene in the process solvent. To remove solvent residues, subsequent cleaning can then be carried out by adsorption on activated carbon or other suitable methods. |