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US 6,136,222 AGranted
Liquid absorbent solutions for separating nitrogen from natural gas
AssigneeBend Research, Inc.
InventorsDwayne T. Friesen, Walter C. Babcock, David J. Edlund, David K. Lyon, Warren K. Miller
Life of this patent
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Abstract
Nitrogen-absorbing and -desorbing compositions, novel ligands and transition metal complexes, and methods of using the same, which are useful for the selective separation of nitrogen from other gases, especially natural gas.
Claims14
A nitrogen-absorbing and -desorbing composition consisting essentially of a solvent with a solubility parameter of .gtoreq.20 MPa.sup.1/2 and a transition metal complex, said complex comprising
- (a) a metal selected from Cr, W, Mn, Fe, Co and Ni;
- (b) at least one reversibly bound molecular nitrogen ligand;
- and
- (c) at least one other monodentate or multidentate ligand that, together with said at least one molecular nitrogen ligand provides four, five or six coordinating atoms to the metal
- wherein said transition metal complex is present in a concentration of .gtoreq.0.1 M in said solvent and said complex enhances the nitrogen solubility therein relative to the nitrogen solubility in said solvent alone.
2 more elements
Dependencies are inferred from the claim text.