1. US20150125373 - Method for absorbing CO₂ from a gas mixture

In a method of absorbing CO₂ from a gas mixture the use of an absorption medium comprising water and at least one amine of formula (I)

• where
• R¹ is a —(CH₂)_n—(XCH₂CH₂)_m—Y—R³ radical where
• R³=hydrogen or an alkyl radical having from 1 to 6 carbon atoms,
• X and Y are each, independently of one another, NR³, oxygen, SO or SO₂, where in the case of Y═SO and in the case of Y═SO₂, R³ is not hydrogen, and Y—R³ can be an N-morpholinyl radical or an N-piperazyl radical,
• n=2 to 4,
• m=0 to 4 and
• R² is hydrogen, an alkyl radical having from 1 to 6 carbon atoms or a radical R¹,
• where m is not 0 when R² is not a radical R¹, Y═NR³ and Y—R³ 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 CO₂ and a separation into two liquid phases during the regeneration of the absorption medium.