Method for producing mixtures consisting of diphenylmethane...

C - Chemistry – Metallurgy – 07 – C

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C07C 263/10 (2006.01) C07C 263/20 (2006.01) C07C 265/14 (2006.01)

Patent

CA 2329655

The invention relates to a method for producing mixtures consisting of diphenylmethane diisocyanates and polyphenylene-polymethylene-polyisocyanates containing a reduced amount of chlorinated secondary products and with a reduced iodine colour index. According to said method, a two-stage reaction of the corresponding mixtures of diphenylmethane-diamines and polyphenylene- polymethylene polyamines with phosgene is carried out in the presence of at least one inert organic solvent at a high temperature. When the phosgenation is complete, the excess phosgene and solvent are separated off and the product of the reaction is treated with heat. The method is characterised in that the mass ratios of phosgene to hydrogen chloride in the detention apparatus in the second stage of phosgenation are simultaneously 10-30:1 in the liquid phase and 1-10:1 in the gas phase.

L'invention concerne un procédé pour la préparation de mélanges de diphénylméthane-diisocyanates et de polyisocyanates de polyphénylène-polyméthylène à teneur réduite en sous-produits chlorés et à indice colorimétrique d'iode réduit, par réaction en deux phases des mélanges correspondants de diamines, de diphénylméthane et de polyamines de polyphénylène-polyméthylène avec du phosgène en présence d'au moins un solvant organique inerte, à température élevée, et une fois la phosgénation achevée, extraction du phosgène et du solvant excédentaires et traitement thermique du produit de réaction. Ce procédé est caractérisé en ce que les rapports pondéraux du phosgène à l'hydrochlorure, dans l'appareil où ils séjournent lors de la deuxième phase de la phosgénation, atteignent dans la phase liquide 10-30:1 et dans la phase gazeuse 1-10:1.

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