WASHING SOLUTION FOR THE ABSORPTION OF CARBON DIOXIDE WITH REDUCED FORMATION OF NITROSAMINES

• US 20150147253A1
• Filed: 07/08/2013
• Published: 05/28/2015
• Est. Priority Date: 07/17/2012
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Fischer, Bjrn, Joh, Ralph, Kinzl, Markus, Kuettel, Diego Andres, Schneider, Rdiger, Wiese, Martin
• Application Number:
  US14/414,111
• Publication Number:
  US 20150147253A1
• Time in Patent Office: Days
• US Class Current: 423/228
• CPC Class Codes: B01D 2251/30 Alkali metal compounds
• CPC Class Codes: B01D 2251/302 of lithium
• CPC Class Codes: B01D 2251/304 of sodium
• CPC Class Codes: B01D 2251/306 of potassium
• CPC Class Codes: B01D 2251/602 Oxides
• CPC Class Codes: B01D 2252/204 Amines
• CPC Class Codes: B01D 2252/20484 with one hydroxyl group
• CPC Class Codes: B01D 2252/20494 Amino acids, their salts or derivatives
• CPC Class Codes: B01D 2252/504 Mixtures of two or more absorbents
• CPC Class Codes: B01D 2252/60 Additives
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/1493 Selection of liquid materials for use as absorbents
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01D 53/96 Regeneration, reactivation or recycling of reactants
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02C 20/40 of CO2

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

1-13. -13. (canceled)

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.

15. 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.

16. The scrubbing solution as claimed in claim 14, comprising

a plurality of alkali metal oxides.

17. 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.

18. The scrubbing solution as claimed in claim 14,

wherein the scrubbing solution is present as aqueous solution.

19. The scrubbing solution as claimed in claim 14, comprising

a plurality of amines.

20. 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.

21. The scrubbing solution as claimed in claim 14,

wherein an amino acid salt is present as amine.

22. 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.

23. 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.

24. The scrubbing solution as claimed in claim 21,

wherein the amino acid salt is a salt of a metal.

27. The scrubbing solution as claimed in claim 24,

wherein the amino acid salt is a salt of an alkali metal.

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.

26. 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.