Adsorbent having utility for CO₂capture from gas mixtures

摘要

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.

主权项

1. 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.