Distillation: processes – separatory – With chemical reaction – Including step of adding catalyst or reacting material
Patent
1996-06-10
1999-05-11
Manoharan, Virginia
Distillation: processes, separatory
With chemical reaction
Including step of adding catalyst or reacting material
203 98, 521160, 560358, 560360, B01D3/34
Patent
active
059024593
ABSTRACT:
There is now provided a method of recycling toluenediisocyanate residue resulting from the production of toluenediisocyanate by the reaction of toluenediamine by phosgenation in the presence of a solvent. In accordance with the teachings of the present invention, the toluenediisocyanate residue is treated at reflux with an alkanolamine to obtain an intermediary product which is distilled thereby giving rise to various products including but not limited to at least one component selected from toluenediamine, oxazolidone and hydroxyethylimidiazolidone. Preferably the alkanolamine employed is a monoethanolamine.
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Bananto Sandy A.
Gagnon Steven D.
BASF Corporation
Borrego Fernando A.
Manoharan Virginia
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