Process for the preparation of aromatic diisocyanates
AssigneeBayer Aktiengesellschaft
InventorsKlaus Biskup, Christian Konig, Eckart Waldau
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Abstract
A continuous process for the preparation of aromatic diisocyanates by phosgenation of the corresponding diamines, in which the reaction is carried out in the gas phase. The mean contact time for the gaseous reactants is from 0.5 to 5 seconds with a mean deviation of no more than 6%. The product diisocyanate is obtained in yields of over 95%.
Claims9
A process for the production of an aromatic diisocyanate comprising reacting a diamine and phosgene at a temperature above the boiling point of the diamine within a mean contact time of from 0.5 to 5 seconds with a mean deviation in the contact time of no more than 6%.
Dependencies are inferred from the claim text.