Interfacial surface structures for carbon dioxide removal systems
In a general aspect, interfacial surface structures for removing carbon dioxide from a gaseous feed are presented. In some cases, a method of removing carbon dioxide gas from a gaseous feed includes wetting surfaces of an interfacial surface structure in a gas-liquid contactor with an alkaline capture solution. The gaseous feed containing the CO 2 gas is passed across the wetted surfaces of the interfacial surface structure to dissolve the CO 2 gas in the alkaline capture solution. A CO 2 -rich alkaline capture solution is collected from the gas-liquid contactor. The CO 2 -rich alkaline capture solution includes dissolved CO 2 gas from the gaseous feed.
1. A method of removing carbon dioxide (CO 2 ) gas from a gaseous feed, the method comprising:
wetting surfaces of an interfacial surface structure in a gas-liquid contactor with an alkaline capture solution, the interfacial surface structure having a specific liquid mass retention at sixty seconds (SLMR t=60 s ) in a range of 10 to 300 kilogram per cubic meter (kg/m 3 );
passing the gaseous feed across the wetted surfaces of the interfacial surface structure to dissolve the CO 2 gas in the alkaline capture solution; and
collecting a CO 2 -rich alkaline capture solution from the gas-liquid contactor, the CO 2 -rich alkaline capture solution containing dissolved CO 2 gas from the gaseous feed.
2. The method of claim 1 , wherein the interfacial surface structure has a specific liquid mass retention at five seconds (SLMR t=5 s ) in a range of 20-500 kg/m 3 .
3. The method of claim 1 , wherein the interfacial surface structure has a specific surface area in a range of 400-5000 square meters per cubic meter (m 2 /m 3 ).
4. The method of claim 1 , wherein a concentration of the CO 2 gas in the gaseous feed is equal to or less than 1000 parts per million.
5. The method of claim 1 , comprising receiving the gaseous feed into the gas-liquid contactor through an inlet of the gas-liquid contactor, wherein the intake absolute pressure of the gaseous feed at the inlet is less than or equal to 110 kPa.
6. The method of claim 1 , wherein the gaseous feed comprises a flue gas, and a concentration of the CO 2 gas in the gaseous feed is in a range of 1 to 20 percent in weight.
7. The method of claim 1 , wherein the interfacial surface structure forms a reticulated structure.
8. The method of claim 7 , wherein the reticulated structure is defined by a plurality of contactor sheets, and at least one of the contactor sheets has at least one of:
an egg crate profile;
a jagged wedge profile;
interlocking fins;
a staggered hemi-ovoid profile;
a pyramid profile; or
a fishbone profile.
9. The method of claim 7 , wherein the reticulated structure is an extruded twisting hexagonal structure.
10. The method of claim 7 , wherein the reticulated structure is a gyroid lattice structure.
11. The method of claim 1 , wherein the interfacial surface structure comprises a set of contactor sheets that are packed with one another and separated by spacers that define spacings between neighboring contactor sheets.
12. The method of claim 11 , wherein one or more of the contactor sheets define at least one through hole.
13. The method of claim 11 , wherein the contactor sheets comprise a first set of contactor sheets and a second set of contactor sheets, wetting the interfacial surface structure comprises wetting the first set of contactor sheets and the second set of contactor sheets, the second set of contactor sheets are configured in tandem with the first set of contactor sheets, and passing the gaseous feed containing the CO 2 gas across the wetted gas-liquid contactor comprises:
passing the gaseous feed across the first set of contactor sheets; and
after passing the gaseous feed across the first set of contactor sheets, passing an output from the first set of contactor sheet across the second set of contactor sheets.
14. The method of claim 1 , wherein the alkaline capture solution comprises:
an aqueous ionic base (M + Y − ),
a phase transfer catalyst, and
a carboxylic acid salt of amino acid.
15. A method of removing carbon dioxide (CO 2 ) gas from a gaseous feed, the method comprising:
wetting surfaces of an interfacial surface structure in a gas-liquid contactor with an alkaline capture solution, the interfacial surface structure having a specific liquid mass retention at five seconds (SLMR t=5 s ) in a range of 20 to 500 kilogram per cubic meter (kg/m 3 );
passing the gaseous feed across the wetted surfaces of the interfacial surface structure to dissolve the CO 2 gas in the alkaline capture solution; and
collecting a CO 2 -rich alkaline capture solution from the gas-liquid contactor, the CO 2 -rich alkaline capture solution containing dissolved CO 2 gas from the gaseous feed.
16. The method of claim 15 , wherein the interfacial surface structure forms a reticulated structure.
17. The method of claim 16 , wherein the reticulated structure is defined by a plurality of contactor sheets, and at least one of the contactor sheets has at least one of:
an egg crate profile;
a jagged wedge profile;
interlocking fins;
a staggered hemi-ovoid profile;
a pyramid profile; or
a fishbone profile.