Process for the separation of high-boiling materials from the re

Details Process for the separation of high-boiling materials from the re Process for the separation of high-boiling materials from the re

1997-02-25

1998-03-17

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

564420, 564421, 564422, 564423, 564424, 203 71, 203 80, C07C20984, C07C20986

Patent

active

057288801

ABSTRACT:
Amine mixtures generated during the production of diaminotoluene by hydrogenating dinitrated aromatic compounds are treated to separate high boiling materials from the desired amine products. In this process, any water of reaction and any solvent are first removed from the diaminotoluene isomer mixture (TDA mixture). The low-boiling TDA isomers are then separated using a TDA isomer distillation column. In the process of the present invention, the bottom phase remaining after the initial distillation contains a mixture of m-TDA and high-boiling materials. This bottom phase is separated and concentrated until the high-boiling material content is from approximately 25 to 60 wt. %. This concentrated bottom phase is then mixed with o-TDA in a ratio of 1:1 to 1:5 and a m-/o-TDA mixture is removed by distillation. The m-/o-TDA mixture thus recovered is then returned to the TDA isomer distillation column.

REFERENCES:
patent: 3428531 (1969-02-01), Dietz
patent: 3546296 (1970-12-01), Gobron et al.
patent: 3781373 (1973-12-01), Gorbon et al.

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