# US 2025/0144546 A1 · Integrated optimized horizontal boxed amine carbon capture system for post combustion emissions

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- Number: US 2025/0144546 A1
- Document ID: US20250144546A1
- Status: Published application
- Kind: A1
- Application number: 18/938,657
- Filed: 2024-11-06
- Published: 2025-05-08
- Earliest claimed: 2023-11-06
- Assignees: PETRONAS Energy Canada Ltd.
- Applicants: PETRONAS Energy Canada Ltd.
- Inventors: Ian BUCHANAN; Darius REMESAT; Austin JACKSON
- Web page: https://patentgrep.com/patent/US20250144546A1

## CPC

- B01D 5/0072: {with filtration}
- B01D 53/1431: {Pretreatment by other processes}
- B01D 53/1475: {Removing carbon dioxide}
- B01D 53/1493: {Selection of liquid materials for use as absorbents}
- B01D 53/18: Absorbing units; Liquid distributors therefor (B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32)
- B01D 2257/504: Carbon dioxide
- B01D 2258/01: Engine exhaust gases
- 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

A series of connected vertical contactors arranged horizontally, that are a compact and lower weight boxed arrangement integrated in multiple processing steps to treat engine exhaust to capture carbon dioxide. A direct contact cooler, optional gas scrubber, liquid CO2 absorbent (e.g., amine) absorption and optional water wash are combined in one overall integrated vessel, separated by internal chambers that is organized horizontally to reduce the weight (and cost) of construction through modular, reduced footprint, lower pump heads, with common internal walls and thinner material of constructions.

## Claims

### Claim 1

A process to capture carbon dioxide from post-combustion exhaust, such as from an engine, that only requires thin-walled vessels and reduces the number of vessel walls by sharing walls between process steps comprising:
direct contact cooling and water condensation and removal in a first chamber;
liquid absorption to capture carbon dioxide in one or more chambers; and
water wash to prevent any liquid absorbent from leaving with the exhaust gas;
integrated with water recycle and liquid absorbent regeneration.

### Claim 2 (depends on 1)

The process of claim 1 where the pressure drop across each step is less than 1.5 kPa.

### Claim 3 (depends on 1)

The process of claim 1 where the pressure drop across the process is less than 6 kPa.

### Claim 4 (depends on 1)

The process of claim 1 where the vessel walls are thinner than 2.7 mm.

### Claim 5 (depends on 1)

The process of claim 1 where the vessel height is less than the road transport height limit, 7 m.

### Claim 6 (depends on 1)

The process of claim 1 where the vessel material can be steel, wood, or plastic.

### Claim 7 (depends on 1)

The process of claim 1 where the liquid absorbent can be a combination of one or all of amine, carbonate, propanediol and piperazine.

### Claim 8 (depends on 1)

The process of claim 1 where internal supports also serve as process baffles.

### Claim 9 (depends on 1)

The process of claim 1 where the internal channels contain a demisting device to agglomerate any entrained liquids from the upstream chamber.

### Claim 10

An apparatus to capture carbon dioxide from a post combustion exhaust, such as from an engine, comprising;
feeding hot exhaust through ducting or piping to a rectangular boxed, and horizontally arranged series of vertical contactor vessels;
cooling the engine exhaust with a direct counter current contact water spray using mass and heat transfer arrangement in an internal chamber;
directing the cooled exhaust through an internal channel to a second internal chamber to be contacted by a direct counter current contact chilled lean liquid CO2 absorbent (e.g., amine) spray using mass transfer arrangement to capture carbon dioxide;
directing the carbon dioxide reduced exhaust stream through another internal channel to a third or more internal chamber(s) to be contacted a second or more time(s) by a direct counter current contact chilled lean liquid CO2 absorbent (e.g., amine) to remove additional carbon dioxide; and
directing the carbon dioxide depleted exhaust stream through another internal channel to a subsequent internal chamber to be contacted by a direct counter current contact water spray and mass transfer arrangement to prevent entrained liquid CO2-rich absorbent from leaving the vessel to atmosphere.

### Claim 11 (depends on 10)

The apparatus of claim 10, where the walls of the box contactor are made of a combination of material and thickness only required to support up to 7 m (23′) of structure.

### Claim 12 (depends on 11)

The apparatus of claim 11, where the walls are made of one of or a combination of stainless steel, carbon steel, plastic, or wood.

### Claim 13 (depends on 12)

The apparatus according to claim 12, where the walls of a steel structure are 12 ga (2.7 mm) or thinner.

### Claim 14 (depends on 13)

The apparatus according to claim 13, where the walls of a plastic structure are 3 mm or thinner.

### Claim 15 (depends on 14)

The apparatus according to claim 14, where the plastics can be one of or a combination of acrylic, composites, polycarbonate, polypropylene, polyvinyl chloride and polymethylmethacrylate.

### Claim 16 (depends on 12)

The apparatus according to claim 12, where the walls of a wood structure are 3 mm thinner.

### Claim 17 (depends on 16)

The apparatus according to claim 16, where the walls of wood are covered with an impervious moisture and chemical resistant layer/barrier.

### Claim 18 (depends on 17)

The apparatus according to claim 17, where the internal channels contain a demisting device to agglomerate any entrained liquids from the upstream chamber.

### Claim 19 (depends on 1)

The process of claim 1 where the regeneration of the liquid absorbent is accomplished using a rotating packed bed absorber.

### Claim 20 (depends on 1)

The process of claim 1 where the regeneration of the liquid absorbent is accomplished using a hollow fibre membrane.

### Claim 21

A method to capture carbon dioxide from a post combustion exhaust, such as from an engine, said method comprising the following steps;
feeding hot exhaust through ducting or piping to a rectangular boxed, and horizontally arranged series of vertical contactor vessels;
cooling the engine exhaust with a direct counter current contact water spray using mass and heat transfer arrangement in an internal chamber;
directing the cooled exhaust through an internal channel to a second internal chamber to be contacted by a direct counter current contact chilled lean liquid CO2 absorbent (e.g., amine) spray using mass transfer arrangement to capture carbon dioxide yielding a resulting carbon dioxide reduced exhaust stream; and
providing at least one of the following steps:
directing the resulting carbon dioxide reduced exhaust stream through another internal channel to a third or more internal chamber(s) to be contacted at least one more time by a direct counter current contact chilled lean liquid CO2 absorbent (e.g., amine) to remove additional carbon dioxide resulting in a the carbon dioxide depleted exhaust stream; and
directing the carbon dioxide depleted exhaust stream through another internal channel to a subsequent internal chamber to be contacted by a direct counter current contact water spray and mass transfer arrangement to prevent entrained liquid CO2-rich absorbent from being released as a gas into the atmosphere.