Process for the Preparation of a Mono-N-Alkypiperazine
申请人:BASF SE
公开号:US20130324732A1
公开(公告)日:2013-12-05
Process for the preparation of a mono-N-alkylpiperazine of the formula I
in which R
1
is C
1
- to C
5
-alkyl or 2-(2-hydroxyethoxy)ethyl,
by reacting diethanolamine (DEOA) of the formula II
with a primary amine of the formula H
2
N—R
1
(III) in the presence of hydrogen and a supported, metal-containing catalyst, where the catalytically active mass of the catalyst, prior to its reduction with hydrogen, comprises oxygen-containing compounds of aluminum, copper, nickel and cobalt and, in the range from 0.2 to 5.0% by weight, oxygen-containing compounds of tin, calculated as SnO, and the reaction is carried out in the liquid phase at an absolute pressure in the range from 95 to 145 bar.