Process for distillatively removing piperazine from an...

Details Process for distillatively removing piperazine from an... Process for distillatively removing piperazine from an...

2007-09-18

2007-09-18

Davis, Brian (Department: 1621)

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

Organic compounds

Amino nitrogen containing

C564S497000, C564S498000, C544S358000

Reexamination Certificate

active

11494733

ABSTRACT:
The invention relates to a process for continuously, distillatively removing piperazine from an ethylenediamine-piperazine mixture under pressure at elevated temperature, by discharging the ethylenediamine at the top and the piperazine at the bottom of a distillation column. For the purpose of improving the quality of the piperazine, especially its color and color stability, the piperazine is subjected directly to circulation conveying it through an evaporator unit operated at a temperature of from about 160° C. to about 170° C. and returning it into the distillation column. After a residence time of from about 30 min to about 60 min in the circulation system, the piperazine is discharged in vapor form from a side draw in the lower section of the distillation column.

REFERENCES:
patent: 3105019 (1963-09-01), Murray, Jr. et al.
patent: 3331756 (1967-07-01), Currier et al.
patent: 2007/0043217 (2007-02-01), Siegert et al.
patent: 1 263 588 (1972-02-01), None

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