Process for purifying a gas by adsorption of the impurities on several active carbons
AssigneeL'Air Liquide, Societe Anonyme a Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude
InventorsChristian Monereau, Serge Moreau
Life of this patent
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Abstract
The gas stream containing one or more gaseous impurities from the group formed by carbon dioxide, water vapor, H2S, alcohols, SO2 and C1-C8 saturated or unsaturated, linear, branched or cyclic hydrocarbons is brought into contact with several different porous carbon adsorbents, that is to say active carbons having different properties and characteristics. The gas is air, nitrogen, hydrogen produced by the reforming or cracking of ammonia or the combustion gas or fermentation gas.
Claims15
A process for the purification of a gas stream containing at least one gaseous impurity selected from the group consisting of CO2, saturated and unsaturated, linear, branched and cyclic hydrocarbons containing at least one carbon atom in their hydrocarbon structure, mercaptans, H2S, SO2, chlorine, ammonia, alcohols, amines and volatile organic compounds, the process comprising:
- bringing the gas stream to be purified successively into contact with particles of a first porous carbon adsorbent, and then with particles of a second porous carbon adsorbent, the particles of the first and second porous carbon adsorbents forming separate and successive layers to remove at least one gaseous impurity on the separate and successive layers of porous carbon adsorbents, and
- wherein the particles of the first porous carbon adsorbent are defined by a first density (D1) and a first specific surface area (SSA1) and the particles of the second porous carbon adsorbent are defined by a second density (D2) and a second specific surface area (SSA2) such that:
- D1<D2 (1)
- and
- SSA1>SSA2 (2)
- and wherein the particles of the first porous carbon adsorbent are further defined by at least one of a first mean pore size (MPS1) and a first pore volume (PV1), and the particles of the second porous carbon adsorbent are defined by at least one of a second mean pore size (MPS2) and a second pore volume (PV2), such that:
- MPS1>MPS2 (3)
- and/or
- PV1>PV2 (4).
A process for the purification of a gas stream containing water vapor as a gaseous impurity and at least one other gaseous impurity selected from the group consisting of CO2, saturated and unsaturated, linear, branched and cyclic hydrocarbons containing at least one carbon atom in their hydrocarbon structure, mercaptans, H2S, SO2, chlorine, ammonia, alcohols amines and volatile organic compounds, the process comprising:
- bringing the gas stream to be purified successively into contact with particles of a first porous carbon adsorbent and then with particles of a second porous carbon adsorbent, the particles of the first and second porous carbon adsorbents forming separate and successive layers for removing at least one gaseous impurity on the separate and successive layers of porous carbon adsorbents, and
- wherein the praticles of the first porous carbon adsorbent are defined by a first density (D1)and a first specific surface area (SSA1) and the particles of the second porous carbon adsorbent are defined by a second density (D2) and a second specific surface area (SSA2) such that:
- D1<D2 (1)
- and
- SSA1>SSA2 (2)
- and wherein the particles of the first porous carbon adsorbent are further defined by at least one of a first mean pore size (MPS1) and a first pore volume (PV1), and the particles of the second porous carbon adsorbent are defined by at least one of a second mean pore size (MPS2) and a second pore volume (PV2), such that:
- MPS1<MPS2 (3)
- and/or
- PV1>PV2 (4).
Dependencies are inferred from the claim text.