申请人:Evonik Degussa GmbH
公开号:US20150125373A1
公开(公告)日:2015-05-07
In a method of absorbing CO
2
from a gas mixture the use of an absorption medium comprising water and at least one amine of formula (I)
where
R
1
is a —(CH
2
)
n
—(XCH
2
CH
2
)
m
—Y—R
3
radical where
R
3
=hydrogen or an alkyl radical having from 1 to 6 carbon atoms,
X and Y are each, independently of one another, NR
3
, oxygen, SO or SO
2
, where in the case of Y═SO and in the case of Y═SO
2
, R
3
is not hydrogen, and Y—R
3
can be an N-morpholinyl radical or an N-piperazyl radical,
n=2 to 4,
m=0 to 4 and
R
2
is hydrogen, an alkyl radical having from 1 to 6 carbon atoms or a radical R
1
,
where m is not 0 when R
2
is not a radical R
1
, Y═NR
3
and Y—R
3
is not an N-morpholinyl radical and not an N-piperazyl radical,
makes it possible to avoid precipitation of a solid during the absorption of CO
2
and a separation into two liquid phases during the regeneration of the absorption medium.