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time, sodium carbonate (Na2CO3) corresponding to salt
Credits
is produced, and the DAC process must separate carbon
ⓒCarbon
dioxidefromthisbasicsalttocompletetheliquidmethod.
Researcher Oh says: “This separation process consists
of two main steps. First, calcium hydroxide (Ca(OH)2) is
added to the compound sodium carbonate to precipitate
calcium carbonate (CaCO3), and high-temperature heat
of about 900 Celsius to this precipitate separates carbon
▲The core principle of the solid method is to utilize carbon dioxide
dioxide.”Inotherwords,carbondioxidemustberemoved
absorbent and chemical properties that can absorb only carbon
from the absorbent through the process of precipitation
dioxide.
and heating using thermal energy to complete the liquid
the method of separation using pressure is to lower the
DACmethod.ProfessorParkexplains,“Liquidmethodis
pressure in the presence of absorbent and air. As the
theoldestandmoststudiedoneandisnowusedtopurify
pressure of the gas increases, the number of molecules
the air in submarines.” However, since it requires high
of carbon dioxide colliding with the solid surface per
thermalenergyintheprocessofusinganabsorbent,there
hour increases, and the number of adsorptions increases.
is a possibility of discharging pollutants generated from
Conversely, lowering the pressure of the gas reduces the
thermal energy production. In addition, there is a risk of
numberofmoleculesofcarbondioxidecollidingwiththe
corrosion because the method requires water. Therefore,
solid absorbent per hour, resulting in natural desorption.
liquidisthemostwidelyusedtechnique;andatthesame
Finally, there is a way to use temperature change. As the
time,itisamethodthatrequirescountermeasuresagainst
temperature increases, the movement of air molecules
concerns.
becomes more active, and they tend to be desorbed
rather than adsorbed on solids. At low temperatures, the
movement of molecules slows down, and carbon dioxide
*Amine: It is a compound in which the hydrogen atom (H) of ammonia (NH3)
is replaced with a hydrocarbon group, which is all atomic groups formed by
binds to the absorbent. Conversely, as the temperature
combiningcarbon(C)andhydrogen.
*Neutralization: A neutralization reaction is a phenomenon in which acid and
increases, the movement of air molecules becomes
basicitymeettoproducewaterandsalt.Forexample,cleaninganacidicoily
dish with basic baking soda produces sodium fatty acid salt corresponding
active, and there is a tendency of desorption rather than
towaterandsoap,whichremovestheoil.
adsorptiononsolids.Therefore,raisingthetemperatureto
about100Celsiuscausescarbondioxidetoseparatefrom
Solid
The second is solid, and it is a method of collecting
the absorbent. According to the “National Technology
carbon dioxide in the atmosphere using solid adsorbents
Proposal Insight with Explanation: Demonstration
in the form of tiny crystals. According to researcher Oh,
and Utilization of DAC Technology” published by the
thecoreprincipleofthesolidmethodistoutilizecarbon
Korea Presidential Commission on Carbon Neutrality
dioxideabsorbentandchemicalpropertiesthatcanabsorb
and Green Growth in 2022, the solid method has an
only carbon dioxide. First, the absorbent is made into a
advantage over liquid method in terms of energy and
solid carrier with holes to form an environment where
water supply required for the process. However, although
carbon dioxide is easily contacted. When a chemical
it is easy to modularize* solid method facilities, it may
with excellent carbon dioxide capture capacity, such as
be more disadvantageous than the liquid method and
amine,isputintotheholeofthiscarrier,asolidabsorbent
has a limitation in that the unit price of the absorbent is
is ready. Thereafter, carbon dioxide is passed through
relativelyhigh.
the completed absorbent. Then, carbon dioxide adheres
to the amine in the absorbent and the adsorption ends.
*Modularization:Itreferstothedegreetowhichcomponentsofasystemcan
beseparatedandrecombined.
This method also requires separating the carbon dioxide
attached to the absorbent, like the liquid method, and
Membrane
to separate the carbon dioxide bonded to the absorbent,
The third is the membrane method, which uses the
a change in pressure or temperature is required. First,
molecular size and speed difference of the gas passing
22
www.theargus.org
time, sodium carbonate (Na2CO3) corresponding to salt
Credits
is produced, and the DAC process must separate carbon
ⓒCarbon
dioxidefromthisbasicsalttocompletetheliquidmethod.
Researcher Oh says: “This separation process consists
of two main steps. First, calcium hydroxide (Ca(OH)2) is
added to the compound sodium carbonate to precipitate
calcium carbonate (CaCO3), and high-temperature heat
of about 900 Celsius to this precipitate separates carbon
▲The core principle of the solid method is to utilize carbon dioxide
dioxide.”Inotherwords,carbondioxidemustberemoved
absorbent and chemical properties that can absorb only carbon
from the absorbent through the process of precipitation
dioxide.
and heating using thermal energy to complete the liquid
the method of separation using pressure is to lower the
DACmethod.ProfessorParkexplains,“Liquidmethodis
pressure in the presence of absorbent and air. As the
theoldestandmoststudiedoneandisnowusedtopurify
pressure of the gas increases, the number of molecules
the air in submarines.” However, since it requires high
of carbon dioxide colliding with the solid surface per
thermalenergyintheprocessofusinganabsorbent,there
hour increases, and the number of adsorptions increases.
is a possibility of discharging pollutants generated from
Conversely, lowering the pressure of the gas reduces the
thermal energy production. In addition, there is a risk of
numberofmoleculesofcarbondioxidecollidingwiththe
corrosion because the method requires water. Therefore,
solid absorbent per hour, resulting in natural desorption.
liquidisthemostwidelyusedtechnique;andatthesame
Finally, there is a way to use temperature change. As the
time,itisamethodthatrequirescountermeasuresagainst
temperature increases, the movement of air molecules
concerns.
becomes more active, and they tend to be desorbed
rather than adsorbed on solids. At low temperatures, the
movement of molecules slows down, and carbon dioxide
*Amine: It is a compound in which the hydrogen atom (H) of ammonia (NH3)
is replaced with a hydrocarbon group, which is all atomic groups formed by
binds to the absorbent. Conversely, as the temperature
combiningcarbon(C)andhydrogen.
*Neutralization: A neutralization reaction is a phenomenon in which acid and
increases, the movement of air molecules becomes
basicitymeettoproducewaterandsalt.Forexample,cleaninganacidicoily
dish with basic baking soda produces sodium fatty acid salt corresponding
active, and there is a tendency of desorption rather than
towaterandsoap,whichremovestheoil.
adsorptiononsolids.Therefore,raisingthetemperatureto
about100Celsiuscausescarbondioxidetoseparatefrom
Solid
The second is solid, and it is a method of collecting
the absorbent. According to the “National Technology
carbon dioxide in the atmosphere using solid adsorbents
Proposal Insight with Explanation: Demonstration
in the form of tiny crystals. According to researcher Oh,
and Utilization of DAC Technology” published by the
thecoreprincipleofthesolidmethodistoutilizecarbon
Korea Presidential Commission on Carbon Neutrality
dioxideabsorbentandchemicalpropertiesthatcanabsorb
and Green Growth in 2022, the solid method has an
only carbon dioxide. First, the absorbent is made into a
advantage over liquid method in terms of energy and
solid carrier with holes to form an environment where
water supply required for the process. However, although
carbon dioxide is easily contacted. When a chemical
it is easy to modularize* solid method facilities, it may
with excellent carbon dioxide capture capacity, such as
be more disadvantageous than the liquid method and
amine,isputintotheholeofthiscarrier,asolidabsorbent
has a limitation in that the unit price of the absorbent is
is ready. Thereafter, carbon dioxide is passed through
relativelyhigh.
the completed absorbent. Then, carbon dioxide adheres
to the amine in the absorbent and the adsorption ends.
*Modularization:Itreferstothedegreetowhichcomponentsofasystemcan
beseparatedandrecombined.
This method also requires separating the carbon dioxide
attached to the absorbent, like the liquid method, and
Membrane
to separate the carbon dioxide bonded to the absorbent,
The third is the membrane method, which uses the
a change in pressure or temperature is required. First,
molecular size and speed difference of the gas passing
22
www.theargus.org
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