# US 8,540,954 B2 · CO2—capture in molten salts

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- Number: US 8,540,954 B2
- Document ID: US8540954B2
- Status: Granted
- Kind: B2
- Application number: 13/322,259
- Filed: 2010-05-28
- Published: 2012-05-24
- Granted: 2013-09-24
- Earliest claimed: 2009-05-28
- Assignees: Universitetet for Miljo-og Biovitenskap Institutt for Matematiske Realfag og Teknologi
- Applicants: Espen Olsen
- Inventors: Espen Olsen
- Web page: https://patentgrep.com/patent/US8540954B2

## CPC

- B01D 53/62: Carbon oxides
- B01D 53/78: with gas-liquid contact
- B01D 2251/30: Alkali metal compounds
- B01D 2251/40: Alkaline earth metal or magnesium compounds
- B01D 2251/404: of calcium
- B01D 2251/602: Oxides
- B01D 2257/504: Carbon dioxide
- 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)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]

## Abstract

The present invention concerns carbon dioxide capture from waste gas, where metal oxides dissolved in salt melts are used as absorbents.

## Claims

### Claim 1

A method for the removal of carbon dioxide from a gas stream, comprising:
a first step of contacting the gas stream with an absorption medium, wherein the absorption medium comprises molten salts containing at least one halide of an alkali or alkali earth metal that have a content of dissolved metal oxide which react with the carbon dioxide and create a metal carbonate, and
a second step of heating the molten salts containing metal carbonate and releasing metal oxide and carbon dioxide,
wherein the method is carried out at a temperature of 600 to 1600° C.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the molten salts comprise chlorides.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the molten salts comprise fluorides.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the metal oxide is selected from the group consisting of MgO, CaO, SrO, BaO, Li2O, Na2O, K2O, Rb2O and Cs2O.

### Claim 5 (depends on 1)

The method according to claim 1, further comprising, in the first step, controlling the temperature of the molten salts so that the carbon dioxide is substantially converted to carbonate, and, in the second step, raising the temperature so that metal oxide and carbon dioxide are released.

### Claim 6 (depends on 2)

The method according to claim 2, further comprising, in the first step, controlling the temperature of the molten salts so that the carbon dioxide is substantially converted to carbonate, and, in the second step, raising the temperature so that metal oxide and carbon dioxide are released.

### Claim 7 (depends on 3)

The method according to claim 3, further comprising, in the first step, controlling the temperature of the molten salts so that the carbon dioxide is substantially converted to carbonate, and, in the second step, raising the temperature so that metal oxide and carbon dioxide are released.

### Claim 8 (depends on 4)

The method according to claim 4, further comprising, in the first step, controlling the temperature of the molten salts so that the carbon dioxide is substantially converted to carbonate, and, in the second step, raising the temperature so that metal oxide and carbon dioxide are released.