# US 2015/0147253 A1 · Washing solution for the absorption of carbon dioxide with reduced formation of nitrosamines

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- Number: US 2015/0147253 A1
- Document ID: US20150147253A1
- Status: Published application
- Kind: A1
- Application number: 14/414,111
- Filed: 2013-07-08
- Published: 2015-05-28
- Earliest claimed: 2012-07-17
- Assignees: Siemens Aktiengesellschaft
- Applicants: Siemens Aktiengesellschaft
- Inventors: Björn Fischer; Ralph Joh; Markus Kinzl; Diego Andres Kuettel; Rüdiger Schneider; Martin Wiese
- Web page: https://patentgrep.com/patent/US20150147253A1

## CPC

- B01D 53/96: Regeneration, reactivation or recycling of reactants
- B01D 53/1475: {Removing carbon dioxide}
- B01D 53/1493: {Selection of liquid materials for use as absorbents}
- B01D 53/62: Carbon oxides
- B01D 2251/30: Alkali metal compounds
- B01D 2251/302: of lithium
- B01D 2251/304: of sodium
- B01D 2251/306: of potassium
- B01D 2251/602: Oxides
- B01D 2252/204: Amines
- B01D 2252/20484: with one hydroxyl group
- B01D 2252/20494: Amino acids, their salts or derivatives
- B01D 2252/504: Mixtures of two or more absorbents
- B01D 2252/60: Additives
- B01D 2257/504: Carbon dioxide
- Y02A 50/20: Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02C 20/40: of CO2
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

A washing solution for the absorption of carbon dioxide is provided. A method for separating carbon dioxide out of a flue gas of an incineration plant is also provided, wherein at least one alkali metal oxide is added as an oxidation agent for nitrites to a washing solution having an amine-containing absorption agent, the flue gas is brought into contact with the washing solution prepared in this manner and the contained carbon dioxide is absorbed, and wherein the washing solution is then heat-treated and the carbon dioxide is desorbed. A corresponding washing solution having an amine-containing absorption agent and having at least one alkali metal oxide as an oxidation agent for nitrites is also provided.

## Claims

### Claim at position 1

-13. (canceled)

### Claim 14

A scrubbing solution for the absorption of carbon dioxide from a flue gas from a combustion plant, comprising:
at least one amine-containing absorbent, and
at least one alkali metal oxide as an oxidant for nitrites.

### Claim 15 (depends on 14)

The scrubbing solution as claimed in claim 14,
wherein the at least one alkali metal oxide is selected from the group consisting of lithium oxide, sodium oxide and potassium oxide.

### Claim 16 (depends on 14)

The scrubbing solution as claimed in claim 14, comprising
a plurality of alkali metal oxides.

### Claim 17 (depends on 14)

The scrubbing solution as claimed in claim 14,
wherein the total proportion of alkali metal oxides corresponds to the order of magnitude of nitrites formed.

### Claim 18 (depends on 14)

The scrubbing solution as claimed in claim 14,
wherein the scrubbing solution is present as aqueous solution.

### Claim 19 (depends on 14)

The scrubbing solution as claimed in claim 14, comprising
a plurality of amines.

### Claim 20 (depends on 14)

The scrubbing solution as claimed in claim 14,
wherein an alkanolamine and/or an amine which is sterically hindered for the formation of carbamate is present as amine.

### Claim 21 (depends on 14)

The scrubbing solution as claimed in claim 14,
wherein an amino acid salt is present as amine.

### Claim 22 (depends on 21)

The scrubbing solution as claimed in claim 21,
wherein the amino acid salt has a carbon substituent from the group consisting of hydrogen, an alkyl, a hydroxyalkyl and an aminoalkyl.

### Claim 23 (depends on 21)

The scrubbing solution as claimed in claim 21,
wherein the amino acid salt has a nitrogen substituent from the group consisting of hydrogen, an alkyl, a hydroxyalkyl and a haloalkyl.

### Claim 24 (depends on 21)

The scrubbing solution as claimed in claim 21,
wherein the amino acid salt is a salt of a metal.

### Claim 25

A process for separating off carbon dioxide from a flue gas from a combustion plant, comprising:
adding at least one alkali metal oxide as oxidant for nitrites to a scrubbing solution comprising an amine-containing absorbent,
bringing the flue gas into contact with the scrubbing solution resulting in absorption of carbon dioxide present, and
subsequently thermally treating the scrubbing solution with desorption of the carbon dioxide.

### Claim 26 (depends on 25)

The process as claimed in claim 25,
wherein a scrubbing solution comprising at least one amine-containing absorbent, and at least one alkali metal oxide as an oxidant for nitrites is treated.

### Claim 27 (depends on 24)

The scrubbing solution as claimed in claim 24,
wherein the amino acid salt is a salt of an alkali metal.