Adsorbent having utility for CO2 capture from gas mixtures
AssigneeEntegris, Inc.
InventorsJ. Donald Carruthers, Melissa A. Petruska, Shaun M. Wilson, Edward A. Sturm
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Abstract
A carbon pyrolyzate adsorbent is described that is selective for carbon dioxide in contact with gas mixtures including carbon dioxide and methane. The adsorbent has a carbon dioxide adsorbent capacity at 1 bar pressure of greater than 50 cm3 carbon dioxide per gram of adsorbent at 273K, a methane adsorption capacity at 1 bar pressure of less than 35 cm3 methane per gram of adsorbent at 21° C., and a bulk density of greater than 0.55 gram per cubic centimeter of volume. Such adsorbent can be utilized, for example, for biogas upgrading, natural gas purification, coal bed methane purification, and refining operations.
Claims34
A method of removing carbon dioxide from a gas mixture including carbon dioxide and methane, said method comprising contacting said gas mixture with a carbon pyrolyzate adsorbent having a carbon dioxide adsorbent capacity at 1 bar pressure of greater than 50 cm3 carbon dioxide per gram of adsorbent at 273K, a methane adsorption capacity at 1 bar pressure of less than 35 cm3 methane per gram of adsorbent at 21° C., and a bulk density of greater than 0.55 gram per cubic centimeter of volume, wherein said gas mixture comprises gas selected from the group consisting of biogas, natural gas, coal bed methane, refining operations gas, methane fuel gas, and steam-methane reforming gas.
A method of making a carbon pyrolyzate adsorbent that is selective for carbon dioxide in contact with gas mixtures including carbon dioxide and methane, said method comprising pyrolyzing a polymer or copolymer of polyvinylidene fluoride or polyvinylidene chloride to form a pyrolyzate, and activating the pyrolyzate under sufficient conditions of environment, pressure, temperature, and time to yield said carbon pyrolyzate adsorbent, having a carbon dioxide adsorption capacity at 1 bar pressure of greater than 50 cm3 carbon dioxide per gram of adsorbent at 273° K, a methane adsorption capacity at 1 bar pressure of less than 35 cm3 methane per gram of adsorbent at 21° C., and a bulk density of greater than 0.55 gram per cubic centimeter of volume.
A method of enhancing removal of carbon dioxide from a gas mixture including carbon dioxide and methane in a process for such removal, said method comprising supplying for use in said process a carbon pyrolyzate adsorbent having a carbon dioxide adsorbent capacity at 1 bar pressure of greater than 50 cm3 carbon dioxide per gram of adsorbent at 273K, a methane adsorption capacity at 1 bar pressure of less than 35 cm3 methane per gram of adsorbent at 21° C., and a bulk density of greater than 0.55 gram per cubic centimeter of volume, as an adsorbent medium for contacting the gas mixture in said process.
An adsorbent that is selective for carbon dioxide in contact with gas mixtures including carbon dioxide and methane, said adsorbent having a carbon dioxide adsorption capacity at 1 bar pressure of greater than 50 cm3 carbon dioxide per gram of adsorbent at 273K, a methane adsorption capacity at 1 bar pressure of less than 35 cm3 methane per gram of adsorbent at 21° C., a bulk density of greater than 0.55 gram per cubic centimeter of volume, and porosity comprising pores having pore size in a range of from 0.30 nm to 0.40 nm.
An apparatus for removing carbon dioxide from a gas mixture including carbon dioxide and methane, said apparatus comprising at least one adsorbent bed of adsorbent having a carbon dioxide adsorption capacity at 1 bar pressure of greater than 50 cm3 carbon dioxide per gram of adsorbent at 273K, a methane adsorption capacity at 1 bar pressure of less than 35 cm3 methane per gram of adsorbent at 21° C., a bulk density of greater than 0.55 gram per cubic centimeter of volume, and porosity comprising pores having pore size in a range of from 0.30 nm to 0.40 nm, and the at least one adsorbent bed being arranged (i) for contacting with the gas mixture during a first period of time to adsorb carbon dioxide on said carbon pyrolyzate adsorbent in the bed, and discharge from the bed a carbon dioxide-reduced methane gas, and (ii) for desorbing previously adsorbed carbon dioxide from the carbon pyrolyzate adsorbent in the bed during a second period of time.
Dependencies are inferred from the claim text.