# US 2013/0153402 A1 · Co2 desorption without stripper

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- Number: US 2013/0153402 A1
- Document ID: US20130153402A1
- Status: Published application
- Kind: A1
- Application number: 13/701,764
- Filed: 2011-06-01
- Published: 2013-06-20
- Earliest claimed: 2010-06-02
- Assignees: Statoil Petroleum AS
- Inventors: John Arild Svendsen
- Web page: https://patentgrep.com/patent/US20130153402A1

## CPC

- B01D 19/0036: {Flash degasification (the other groups take precedence)}
- B01D 5/006: {with evaporation or distillation}
- B01D 53/1425: {Regeneration of liquid absorbents}
- B01D 53/1475: {Removing carbon dioxide}
- B01D 53/62: Carbon oxides
- B01D 53/78: with gas-liquid contact
- F23J 15/04: using washing fluids {(scrubbers for removing solids only F23J15/022)}
- B01D 2257/504: Carbon dioxide
- F23J 2215/50: Carbon dioxide
- F23J 2219/40: Sorption with wet devices, e.g. scrubbers
- Y02C 20/40: of CO2
- Y02E 20/32: Direct CO2 mitigation
- 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)
- F23J: REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES (combustion apparatus for consuming smoke or fumes, e.g. exhaust gases, F23G7/06)
- Y02C: CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A CO2 desorption method and equipment for performing this method is described. More specific, a method for desorbing CO2 from an absorption fluid without involving a traditional stripper but instead using a heat exchanger as a flash-tank is disclosed. Further described is the utilization of cooling heat from a condenser for cooling the lean absorbent fluid.

## Claims

### Claim 1

A method for desorbing carbon dioxide from a CO2 rich absorption fluid comprising a CO2 absorbent, a solvent and absorbed CO2, characterised in that the method comprises
heating the CO2 rich absorption fluid,
expanding the heated CO2 rich absorption fluid in a flash tank,
separating the expanded absorption fluid in a vapour phase comprising desorbed CO2 and vaporised solvent and a main liquid phase comprising CO2 lean absorption fluid,
condensing at least part of the solvent within the vapour phase, and
mixing the condensed solvent with the main liquid phase.

### Claim 2 (depends on 1)

A method according to claim 1, characterised in that the difference in CO2 loading between the rich and lean amine stream is within the range 0.20-0.30 mol CO2/mol absorbent, preferably between 0.23-0.27 mol CO2/mol absorbent.

### Claim 3 (depends on 1)

A method according to claim 1, characterised in that the method further comprises recycling a part of the main liquid phase into the rich absorption fluid prior to the mixing with condensed solvent.

### Claim 4 (depends on 1)

A method according to claim 1, characterised in that the method further comprises heating a part of the main liquid phase and returning it to the flash tank.

### Claim 5

A system for desorbing carbon dioxide from a CO2 rich absorption fluid, characterised in that the system comprises a flash-tank with an inlet, a vapour outlet and liquid outlet, where the vapour outlet is in fluid communication with an inlet to a condenser, where the condenser has a condensed fluid outlet in fluid communication with the liquid outlet from the flash-tank.

### Claim 6 (depends on 5)

A system according to claim 5, characterised in that the system further includes a system for supplying heat to the flash-tank.

### Claim 7 (depends on 5)

A system according to claim 5, characterised in that the flash-tank is a reboiler, a stratified flow pipe or a fired heater combined with a vessel.

### Claim 8 (depends on 5)

A system according to claim 5, characterised in that the system further comprises a recycling pipeline in fluid communication with the liquid outlet and an inlet to the flash tank, arranged up stream the fluid communication between the condensed fluid outlet and the liquid outlet.