Patent · US Expired

Recovery of N-ethylpiperazine by distillation

US5626724A · kind A · utility

1Cited by

4References

4Claims

0Family size

Assignee

BASF SE

Inventors

Klaus-Dieter Malsch · Schifferstadt, DE
Douglas Hutton · Schifferstadt, DE
Ernst Lang · Gerlingen, DE

Key dates

Filing date	Aug 2, 1995
Grant date	May 6, 1997
Priority date	—
Expiry date	Aug 2, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D295/023
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

In a process for the recovery of N-ethylpiperazine by distillation from mixtures with N,N'-diethylpiperazine, piperazine, ethanol, water and accompanying substances, water is added in a manner such that, at the location of the addition of the water, the piperazine concentration is greater than the N-ethylpiperazine concentration. The water may be added to the reflux to the top of the column.

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