distinguish between adsorption and absorption?
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Absorption is the process in which a fluid is dissolved by a liquid or a solid (absorbent). Adsorption is the process in which atoms, ions or molecules from a substance (it could be gas, liquid or dissolved solid) adhere to a surface of the adsorbent. Adsorption is a surface-based process where a film of adsorbate is created on the surface while absorption involves the entire volume of the absorbing substance.
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Hi there!
!! ABSORPTION !!
Absorption is used to remove one or more gaseous components from a gas flow using a solvent. Absorp- tion can have different aims :
♦ The gaseous component to be removed is a product that is wanted.
♦ The gaseous component to be removed is unwanted. This could be the case when removing contaminantes from an exhaust gas flow.
♦ Production of a liquid; one example would be obtaining hydrochloric acid by absorption of HCl gas in water.
♦ At least three substances are involved in the absorption: the gaseous component to be removed (absorbate), the carrier gas and the solvent (absorbent).
!! ADSORPTION !!
Adsorption is used to remove individual components from a gas or liquid mixture. The component to be removed is physi- cally or chemically bonded to a solid surface.
♦ The component removed from a gas or liquid mixture by adsorption can either be a product that is wanted or an impurity. In the latter case, the aim could be to clean exhaust gases.
♦ The solid is referred to as the adsorbent and the adsorbed component as the adsorbate. Where possible, the adsorbent should only bond the adsorbate and not the other compo- nents in the mixture to be separated. Other important require- ments for the adsorbent are a large specific surface (high porosity) and good regeneration properties.
♦ Activated carbon is a frequently used adsorbent. As adsorption is enhanced by low temperature and high pressure, high temperature and low pressure are used to promote regeneration, i.e. desorption. This means that water vapour or hot inert gas can be used to regenerate the adsorbent.
[ Thank you! for asking the question. ]
Hope it helps!
!! ABSORPTION !!
Absorption is used to remove one or more gaseous components from a gas flow using a solvent. Absorp- tion can have different aims :
♦ The gaseous component to be removed is a product that is wanted.
♦ The gaseous component to be removed is unwanted. This could be the case when removing contaminantes from an exhaust gas flow.
♦ Production of a liquid; one example would be obtaining hydrochloric acid by absorption of HCl gas in water.
♦ At least three substances are involved in the absorption: the gaseous component to be removed (absorbate), the carrier gas and the solvent (absorbent).
!! ADSORPTION !!
Adsorption is used to remove individual components from a gas or liquid mixture. The component to be removed is physi- cally or chemically bonded to a solid surface.
♦ The component removed from a gas or liquid mixture by adsorption can either be a product that is wanted or an impurity. In the latter case, the aim could be to clean exhaust gases.
♦ The solid is referred to as the adsorbent and the adsorbed component as the adsorbate. Where possible, the adsorbent should only bond the adsorbate and not the other compo- nents in the mixture to be separated. Other important require- ments for the adsorbent are a large specific surface (high porosity) and good regeneration properties.
♦ Activated carbon is a frequently used adsorbent. As adsorption is enhanced by low temperature and high pressure, high temperature and low pressure are used to promote regeneration, i.e. desorption. This means that water vapour or hot inert gas can be used to regenerate the adsorbent.
[ Thank you! for asking the question. ]
Hope it helps!
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