Process for recovering polyisocyanates from the distillation...

Details Process for recovering polyisocyanates from the distillation... Process for recovering polyisocyanates from the distillation...

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2076246

Mo3771 LeA 28,493 A PROCESS FOR RECOVERING POLYISOCYANATES FROM THE DISTILLATION RESIDUES OBTAINED IN THE PRODUCTION OF TOLYLENE DIISOCYANATE ABSTRACT OF THE DISCLOSURE The invention relates to a process for recovering a distillate consisting essentially of tolylene diisocyanate and an isocyanate-group-containing sump product containing less than 200 ppm (by weight) tolylene diisocyanate from A) distillation residues obtained in the production of tolylene diisocyanate by mixing of the distillation residues A) with B) optionally urethane- and/or allophanate-modified polyisocyanates or polyisocyanate mixtures of the diphenyl methane series, heating of the mixture to 190 to 250°C and simultaneously or subsequently working up by distillation. Mo3771

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