C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 263/20 (2006.01) C07C 7/04 (2006.01) C07C 263/10 (2006.01) C10G 7/00 (2006.01) C07C 265/14 (2006.01)
Patent
CA 2431439
Process for the purification of toluenediisocyanate from a crude distillation feed comprising toluenediisocyanate, an organic solvent and less than 2% by weight phosgene by separating the crude distillation feed in a dividing-wall distillation column into at least four product fractions P1 - P4. P1 is a phosgene enriched low-boiler product, P2 is a solvent-enriched product, P3 is a high boiler enriched bottoms and P4 is a toluenediisocyanate product stream.
Brady Bill
Keggenhoff Berthold
Ruffert Gerhard
Steffens Friedhelm
Verkerk Kai
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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