Patent · US Active

Process for distillatively removing piperazine from an ethylenediamine-piperazine mixture

US7271292B2 · kind B2 · utility

0Cited by

2References

1Claims

0Family size

Assignee

BASF SE

Inventors

Michael Jödecke · Frankenthal (Pfalz), DE
Ortmund Lang · Quirnbach, DE
Gunther van Cauwenberge · Temse, BE
Matthias Frauenkron · Freinsheim, DE

Key dates

Filing date	Jul 28, 2006
Grant date	Sep 18, 2007
Priority date	—
Expiry date	Jul 28, 2026

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D295/00
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.