Method for the distillative recovery of toluylenediamine

Details Method for the distillative recovery of toluylenediamine Method for the distillative recovery of toluylenediamine

2005-01-07

2008-03-11

Barts, Samuel A (Department: 1621)

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

Organic compounds

Amino nitrogen containing

Reexamination Certificate

active

07342134

ABSTRACT:
The invention relates to a process for distillatively preparing TDA from a reactant stream comprising TDA, high boilers and low boilers in a dividing wall column in which a dividing wall is disposed in the longitudinal direction of the column to form an upper combined column region (2), a lower combined column region (3), a feed section (4) having a rectifying section (5) and stripping section (6), and also a withdrawal section (7) having a rectifying section (9) and stripping section (8), which comprises the following steps:a. feeding the reactant stream (13) into the feed section (4) of the dividing wall column (1);b. drawing off a low boiler fraction via the top of the column (11);c. drawing off TDA via a side draw (14) in the withdrawal section (7) of the dividing wall column (1);d. drawing off a low boiler fraction via the bottom of the column (12).

REFERENCES:
patent: 101 00 552 (2002-07-01), None
patent: 1 303 562 (1973-01-01), None
patent: 94/06752 (1994-03-01), None
“SRI—Report 1A”, pp. 55 to 65, 1968.

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