Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Patent
1992-08-11
1994-05-24
Manoharan, Virginia
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
203 91, 203DIG6, 203DIG16, 521160, 528 44, 560352, B01D 310
Patent
active
053145887
ABSTRACT:
A process for recovering a distillate 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.degree. to 250.degree. C. and simultaneously or subsequently working up by distillation.
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Database WPIL--AN 88-308139 & DD-A-257 827 (Veb Synthesewerk Schwarzheide) Abstract.
Konig Christian
Weintritt Volker
Zarnack Uwe J.
Akorli Godfried R.
Bayer Aktiengesellschaft
Gil Joseph C.
Manoharan Virginia
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