Process for the purification of mixtures of toluenediisocyanate

Details Process for the purification of mixtures of toluenediisocyanate Process for the purification of mixtures of toluenediisocyanate

C - Chemistry, Metallurgy

07

C

C07C 263/18 (2006.01) C07C 7/04 (2006.01) C07C 263/10 (2006.01) C10G 7/00 (2006.01) C07C 265/14 (2006.01)

Patent

CA 2431441

A process for the purification of toluenediisocyanate by fractionating a crude distillation feed containing toluenediisocyante, an organic solvent and less than 2% by weight of phosgene in a heat integrated system having an upstream distillation column, an interchanges and a downstream distillation column which are connected in series. The vapor which is recovered from the upstream distillation column is used to reboil the bottoms product of the downstream distillation column or the feed to the downstream distillation column in the interchanger. The crude distillation feed comprising less than 2% by weight of phosgene is fractionated into three product fractions P1 - P3 and optionally a fourth fraction P4. P1 is a noncondensible gas stream enriched with phosgene and/or low-boilers. P2 is a solvent -enriched product. P3 is a high boiler enriched bottoms product comprising toluenediisocyanate, and P4 is a toluenediisocyanate enriched stream lean in highboilers and reaction residues.

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