Method of separating gaseous mixture
First Claim
1. A method of separating at least a first gas from a gaseous mixture, which comprises contacting a gaseous mixture containing a first and a second gas having different chemical compositions in an amount of at least 50% by volume based on the entire mixture with a molecular sieving carbonaceous porous body, said porous body having (1) a carbon content of at least 85% by weight, (2) an apparent density of 0.1 to 0.8 g/cm3, (3) a porosity of 50 to 95%, (4) a maximum value of the pore diameter distribution at a pore diameter of not more than 10 Å
- and a pore volume at a pore diameter in the range of 15 to 200 Å
of not more than 0.1 cm3 /g and containing (5) open cells in a three-dimensional network structure so that the open cells of the porous body form substantial flow passages for the gaseous mixture, thereby to adsorb at least the second gas physically on the porous body, said open cells having an average diameter of 1 to 500 micrometers.
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Abstract
A method of separating at least a first gas from a gaseous mixture, in which a gaseous mixture containing a first and a second gas having different chemical compositions in an amount of at least 50% by volume based on the entire mixture is contacted with a carbonaceous porous body having a carbon content of at least 85% by weight and containing open cells in a three-dimensional network structure so that the open cells of the porous body form substantial flow passages for the gaseous mixture, thereby to adsorb at least the second gas physically on the porous body.
34 Citations
15 Claims
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1. A method of separating at least a first gas from a gaseous mixture, which comprises contacting a gaseous mixture containing a first and a second gas having different chemical compositions in an amount of at least 50% by volume based on the entire mixture with a molecular sieving carbonaceous porous body, said porous body having (1) a carbon content of at least 85% by weight, (2) an apparent density of 0.1 to 0.8 g/cm3, (3) a porosity of 50 to 95%, (4) a maximum value of the pore diameter distribution at a pore diameter of not more than 10 Å
- and a pore volume at a pore diameter in the range of 15 to 200 Å
of not more than 0.1 cm3 /g and containing (5) open cells in a three-dimensional network structure so that the open cells of the porous body form substantial flow passages for the gaseous mixture, thereby to adsorb at least the second gas physically on the porous body, said open cells having an average diameter of 1 to 500 micrometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- and a pore volume at a pore diameter in the range of 15 to 200 Å
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12. A method of separating a first gas from a second gas, which comprises the steps of flowing a gaseous mixture containing said first and second gases, the sum of the amounts of said first and second gases being at least 50% by volume, based on the entire amount of said gaseous mixture, through a bed consisting of a carbonaceous porous body having a carbon content of at least 85% by weight, said porous body having macropores providing open, intercommunicating cells distributed in a three-dimensional network structure and defining gas flow passages through said porous body, said cells having an average pore diameter of 1 to 500 micrometers, the walls of said cells having micropores therein for adsorbing said second gas, said porous body having (1) an apparent density of from 0.1 to 0.8 g/cm2, (2) a porosity of 50 to 95%, (3) a maximum value of the pore diameter distribution at a pore diameter of not more than 10 Å
- and (4) a pore volume at a pore diameter in the range of 15 to 200 Å
of not more than 0.1 cm3 /g, said carbonaceous porous body having been prepared by forming a synthetic resin porous body consisting essentially of 10 to 50% by weight of polyvinyl alcohol, 10 to 40% by weight of melamine resin and the balance is essentially phenolic resin, and then carbonizing said synthetic resin porous body in a nonoxidizing atmosphere at a temperature of 500°
to 700°
C. - View Dependent Claims (13, 14, 15)
- and (4) a pore volume at a pore diameter in the range of 15 to 200 Å
Specification