Case Number 101020 - Novel Sorbents for Separation of CO2 at a Wide Temperature Range

Contact: Geoffrey Pinski
Phone: 513-558-5696

Description:  1. Gases that occur in nature or that are produced in industrial processes often contain carbon dioxide (CO2). Because of process requirements, or because of the end result desired, it is sometimes desirable to remove carbon dioxide from a mixture of CO2 and other gases.
2. Traditional techniques for separation of CO2 in gas mixtures through absorption rely on high-aluminum zeolites, which have the disadvantage of significant mass transfer resistances, with consequent slower pressurization/depressurization steps; and competitive absorption of water and CO2, with corresponding reduced efficiency. More recent approaches involve the use of lithium salts and lithium-containing preparations which are unacceptable for use at high temperatures due to the sublimation of Lithium.
1. This invention presents a new class of sorbent preparations for the absorption of CO2 in gaseous mixtures. The materials developed are able to remove CO2 from mixtures of gases which are both more polar and less polar than CO2 over a wide range of temperatures. The strength of the sorbent action of these materials may also be chemically adjusted, allowing a user a tailor-design a particular sorbent for a particular application.
2. The sorbent action of these materials is highly reproducible and the materials can be produced at a low cost. The new sorbents are poison-tolerant and mechanically strong. They have been tested and found to be effective in applications from 50 degrees to 650 degrees Celsius; and they have excellent reversibility.
3. These sorbents exhibit high selectivity/capability in rejecting water.
Areas of Application
The new materials may have application in many processes in which CO2 is to be removed from mixtures of other gases, such as coal combustion and gasification; removal of CO2 (and enrichment of hydrogen) in water gas shift reactions; and fuel-cell-related applications.