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US 8,506,914 B2Granted
N-functionalized imidazole-containing systems and methods of use
AssigneeThe Board of Trustees of The University of Alabama
InventorJason E. Bara
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Abstract
Systems containing imidazoles or blends of imidazoles and amines are described herein. Methods of their preparation and use are also described herein. The methods of using the systems include the reduction of volatile compounds from gas streams and liquid streams.
Claims43
A method for removing carbon dioxide from a stream, comprising:
- contacting the stream with a solvent system comprising an N-functionalized imidazole and an amine to capture the carbon dioxide,
- wherein the N-functionalized imidazole is non-ionic under neutral conditions and the N-functionalized imidazole and amine comprises more than 97% by weight of the solvent system.
A method for removing carbon dioxide, sulfur dioxide, or hydrogen sulfide from a stream, comprising:
- contacting the stream with a solvent system comprising an N-functionalized imidazole,
- wherein the N-functionalized imidazole is non-ionic under neutral conditions, and the N-functionalized imidazole comprises at least 50% by weight of the solvent system.
A method for sweetening a natural gas feed stream, comprising:
- contacting the natural gas feed stream with a solvent system comprising an N-functionalized imidazole, wherein the N-functionalized imidazole is non-ionic under neutral conditions and comprises at least 50% by weight of the solvent system, to form a purified natural gas feed stream and a gas-rich system;
- and
- separating the purified natural gas feed stream from the gas-rich system.
A solvent system for capturing volatile compounds, comprising:
- at least 50% by weight of an N-functionalized imidazole, wherein the N-functionalized imidazole is non-ionic under neutral conditions;
- and
- the volatile compound is selected from the group consisting of carbon dioxide, hydrogen sulfide, sulfur dioxide, nitrogen oxide, nitrogen dioxide, carbonyl sulfide, carbon disulfide, and mixtures thereof.
Dependencies are inferred from the claim text.