Process for the preparation of toluenediamine

Details Process for the preparation of toluenediamine Process for the preparation of toluenediamine

2007-12-11

2007-12-11

Barts, Samuel (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C560S360000

Reexamination Certificate

active

11482404

ABSTRACT:
Toluenediamine is produced and separated from by-products of the reaction by:a) hydrogenating dinitrotoluene in the presence of a catalyst,b) separating the catalyst, water and optionally solvent from the hydrogenation reaction mixture to give crude toluenediamine, andc) separating by distillation the crude toluenediamine in a separating wall column into at least four product streams P1, P2, P3and P4. The product stream P1is a stream containing low boilers. The product stream P2is a stream containing o-toluenediamine. The product stream P3is a stream containing m-toluenediamine. The product stream P4is a stream containing high boilers and m-toluenediamine.

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Ing. Eng. Chem. Res. 37, (month unavailable) 1998, pp. 3444-3454, Rakesh Agrawal and Zbigniew T. Fidkowski, “Are Thermally Coupled Distillation Columns Always Thermodynamically More Efficient for Ternary Distillations.”

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