Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Reexamination Certificate
2006-10-10
2006-10-10
Manoharan, Virginia (Department: 1764)
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
C203S071000, C203S100000, C560S347000, C560S352000, C560S359000
Reexamination Certificate
active
07118653
ABSTRACT:
Process for the purification of toluenediisocyanate from a crude distillation feed which includes 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.P1is a phosgene enriched low-boiler product,P2is a solvent-enriched product,P3is a high boiler enriched bottoms andP4is a toluenediisocyanate product stream.
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Brady Bill
Keggenhoff Berthold
Ruffert Gerhard
Steffens Friedhelm
Verkerk Kai
Bayer Aktiengesellschaft
Gil Joseph C.
Manoharan Virginia
Whalen Lyndanne M.
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