High-density adsorbent and method of producing same
First Claim
1. A method of producing a dimensionally stable, high-density adsorbent, comprising the steps of:
- a) mixing high surface area carbon particles with a solution of a binder in a solvent to form a slurry and thereby wet each particle of carbon with the solution of binder, said binder being selected from the group consisting of methylcellulose and a polyvinyl alcohol;
b) removing the solvent from the slurry prepared in step (a) to obtain particles of carbon coated with a film of the binder; and
c) compacting the binder-coated particles of carbon under pressure of about 140 to about 600 MPA to provide a compacted mass of high surface area carbon particles bound together and defining a network of substantially to cause a reduction of about 50 to about 200% in bulk volume of the mass and a corresponding increase of about 50 to about 200% in density, thereby obtaining an adsorbent capable of withstanding powdering when subjected to vibration and exhibiting a gas storage capacity increase of about 20 to about 100% over that of the high surface area carbon particles in loose form.
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Abstract
The invention is concerned with a high-density adsorbent comprising a compacted mass of high surface area carbon particles bound together with a binder and defining a network of substantially unobstructed micropores, the mass of carbon particles having been compacted under a pressure sufficient to cause a reduction of about 50 to about 200% in bulk volume of the mass and a corresponding increase of about 50 to about 200% in density, thereby providing a gas storage capacity increase of about 20 to about 100% over that of the high surface area carbon particles in loose or uncompacted form. The high-density adsorbent according to the invention is particularly useful in adsorption storage systems for low-pressure storage of compressed natural gas.
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Citations
23 Claims
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1. A method of producing a dimensionally stable, high-density adsorbent, comprising the steps of:
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a) mixing high surface area carbon particles with a solution of a binder in a solvent to form a slurry and thereby wet each particle of carbon with the solution of binder, said binder being selected from the group consisting of methylcellulose and a polyvinyl alcohol; b) removing the solvent from the slurry prepared in step (a) to obtain particles of carbon coated with a film of the binder; and c) compacting the binder-coated particles of carbon under pressure of about 140 to about 600 MPA to provide a compacted mass of high surface area carbon particles bound together and defining a network of substantially to cause a reduction of about 50 to about 200% in bulk volume of the mass and a corresponding increase of about 50 to about 200% in density, thereby obtaining an adsorbent capable of withstanding powdering when subjected to vibration and exhibiting a gas storage capacity increase of about 20 to about 100% over that of the high surface area carbon particles in loose form. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23)
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18. A method of producing a dimensionally stable, high-density adsorbent, comprising the steps of:
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a) a mixing high surface area carbon particles in the form of a powder with a solution of a binder comprising a polyvinyl alcohol in a solvent to form a slurry and thereby wet each particle of carbon with the solution of binder; b) removing the solvent from the slurry prepared in step (a) to obtain particles of carbon coated with a film of the binder; and c) forming the binder coated particles of carbon into a shaped product by compacting the particles under a pressure of from about 140 MPa to about 600 MPa to cause binding of the carbon particles together without substantial obstruction of micropores defined in the particles, thereby obtaining an adsorbent capable of withstanding powdering when subjected to vibration and having a density substantially greater than that of the high surface area carbon in particulate form.
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Specification