Carbon dioxide adsorbent, method for manufacturing the same, and carbon dioxide processing system
A method for manufacturing a carbon dioxide adsorbent includes preparing an amine aqueous solution having an amine compound concentration ranging from 5% to 70% inclusive and a temperature ranging from 10° C. to 100° C. inclusive, impregnating silica gel with the amine aqueous solution, and aeration-drying the silica gel carrying the amine compound. The silica gel has a particle size ranging from 1 mm to 5 mm inclusive, an average pore diameter ranging from 10 nm to 100 nm inclusive, and a pore volume ranging from 0.1 cm 3 /g to 1.3 cm 3 /g inclusive.
1. A method for manufacturing a carbon dioxide adsorbent comprising:
preparing an amine aqueous solution having an amine compound at a concentration that is in a range of from 5 wt % to 70 wt % inclusive and a temperature that is in a range of from 10° C. to 100° C. inclusive;
impregnating silica gel with the amine aqueous solution; and
aeration-drying the silica gel carrying the amine compound,
wherein the silica gel has: (i) spherical shape, (ii) a particle size that is in a range of from 1 mm to 5 mm inclusive, (iii) an average pore diameter that is in a range of from 30 nm to 100 nm inclusive, (iv) a pore volume that is in a range of from 0.1 cm 3 /g to 1.3 cm 3 /g inclusive, and (v) a waterproof property N that is defined by an expression (1) and that is not lower than 45%,
N =( W/W 0 )×100 (1)
where
N is the waterproof property in percentage (%) of the silica gel, W 0 is a total number of particles of the silica gel immersed in water, and W is a number of particles of the silica gel not subjected to breakage out of W 0 .
2. The method for manufacturing a carbon dioxide adsorbent according to claim 1 , wherein the amine compound is at least one compound selected from a group of amines having at least one hydroxyl group and polyamines.
3. The method for manufacturing a carbon dioxide adsorbent according to claim 1 , wherein the average pore diameter is in a range of from 70 nm to 100 nm inclusive.