C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 263/10 (2006.01) C07C 263/20 (2006.01) C07C 265/14 (2006.01)
Patent
CA 2445209
The invention is directed to a process for the purification of toluenediisocyanate from a crude distillation feed comprising less than 2% by weight of phosgene by a) fractionating the crude distillation feed comprising less than 2% by weight of phosgene to remove the solvent and optionally the reaction residues to produce a crude toluylenediisocyanate feed comprising less than 20% by weight of solvent and b) separating the crude toluylenediisocyanat feed comprising less than 20% by weight of solvent in a dividing-wall distillation column into four product fractions P1 - P4, whereby P1 is a vapor phase low-boiler and solvent-enriched gas stream, P2 is a low-boiler and solvent-enriched product, P3 is a high boiler enriched bottoms product comprising toluenediisocyanat and P4 is a toluenediisocyanate product stream lean in low-boilers, high-boilers and reaction residues.
Brady Bill Jr.
Gruen Marcus Paul
Keggenhoff Berthold
Schal Hans-Peter
Verkerk Kai
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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