Patent # 4,680,037 containing 26 claims, issued 07/14/1987. The present invention is a cobalt complex having the structural formula: [Figure] wherein each R₁ is independently hydrogen, a phenyl or a C₁ -C₆ alkyl group; each R₂ is independently hydrogen or a C₁ -C₆ alkyl group; R₃ is a C₄ -C₃₀ hydrocarbyl radical connecting the two carbonyl carbons; and Y is o-phenylene, --CH₂)_a wherein "a" is 2 or 3, --CH₂)_b NR₄ --CH₂)_c, wherein "b" and "c" are independently 2 or 3 and R₄ is hydrogen or a C₁ -C₁₂ alkyl group. These complexes have the ability to selectively and reversibly bind oxygen, thus making them useful components of oxygen separation membranes and absorbents.

 

Pillared cobalt complexes for oxygen separation:

Patent # 4,735,634 containing 20 claims, issued 04/05/1988. The present invention is a cobalt complex having the structural formula: [Figure] wherein each R₁ is independently, a phenyl or a C₁ -C₆ alkyl group; each R₂ is independently hydrogen, a phenyl, or a C₁ -C₆ alkyl group; R₃ is either N-succinimido substituted with a C₃ or greater hydrocarbon functionality at the carbon atoms .alpha. to the imido carbonyl carbons, or a carbonyl functionality having a C₁ greater hydrocarbon substituent with the proviso that if said substituent is methyl, R₂ cannot be hydrogen; and Y is o-phenylene, --CH₂ --_a, wherein "a" is 2 or 3, --CH₂ --_b NR₄ --CH₂ --_c, wherein "b" and "c" are independently 2 or 3 and R₄ is hydrogen or a C₁ -C₁₂ alkyl group. These complexes have the ability to selectively and reversibly bind oxygen, thus making them useful components of oxygen separation membranes and absorbents.

 

Process using cyanocobaltate complexes for removing oxygen from a stream:

Patent # 5,141,725 containing 23 claims, issued 08/25/1992. A process is provided for selectively separating oxygen from an oxygen-containing fluid stream by bringing said fluid stream into contact with a high capacity solid state cyanocobaltate complex in a non-aluminosilicate environment represented by the chemical formula: A_x/z^z+ [Co(CN)_n ]^x- .multidot.pS where: A is an alkali, alkaline earth, transition, or Group 12 metal atom; z is 1, 2 or 3; n is any number from 3 to 5; x is n-2; p is any number from greater than zero to 6; and S is a ligand which is capable of coordinating with A^z+, Co or both. These complexes chemically bind oxygen to form novel oxygen adducts, thereby selectively removing oxygen from the fluid stream. The bound oxygen may be recovered by increasing the temperature or by reducing the partial pressure of O₂ above the adduct.

Cyanocobaltate oxygen adducts:

Patent # 5,126,466 containing 11 claims, issued 06/30/1992. A process is provided for selectively separating oxygen from an oxygen-containing fluid stream by bringing said fluid stream into contact with a high capacity solid state cyanocobaltate complex in a non-aluminosilicate environment represented by the chemical formula: A_X/Z^Z+ [Co(CN)_n ]^X- .cndot.pS where: A is an alkali, alkaline earth, transition, or Group 12 metal atom; Z is 1, 2 or 3; n is any number from 3 to 5; X is n-2; p is any number from greater than zero to 6; and S is a ligand which is capable of coordinating with A^Z+, Co or both. These complexes chemically bind oxygen to form novel oxygen adducts, thereby selectively removing oxygen from the fluid stream. The bound oxygen may be recovered by increasing the temperature or by reducing the partial pressure of O₂ above the adduct.

Reversible oxygen sorbent compositions:

Patent # 5,208,335 containing 14 claims, issued 05/04/1993. High Capacity solid state cyanocobaltate complexes represented by the chemical formula: [(A)_a (R₄ N)_b ]^z+_x/z [Co(CN)_n ]^x- .multidot.pS where: A is alkali metal atom, alkaline earth metal atom, Zn, Cd or Hg atom; a is any number from 0 to 2.5 each R is independently C₁ -C_1O substituted or unsubstituted alkyl, aryl or aralkyl; or a long chain hydrocarbon polymer b is any number from greater than zero to 3 z is 1, 2 or 3; n is any number from 3 to 5; x is n-2; p is any number from greater than zero to 6; and S is a ligand which is capable of coordinating with [(A)_a (R₄ N)_b 9 ^z+, Co or both are capable of chemically binding oxygen to form novel oxygen adducts, thereby selectively removing oxygen from an oxygen-containing fluid stream. The bound oxygen may be recovered from the complexes by increasing the temperature or by reducing the partial pressure of O₂ above the adduct.

Process for reversibly binding oxygen:

Patent # 5,294,418 containing 18 claims, issued 03/15/1993. High capacity solid state compositions comprising cyanocobaltate complexes have been developed which are capable of reversibly chemically binding oxygen to selectively remove oxygen from an oxygen-containing fluid stream. The cyanocobaltate complexes which make up the compositions comprise a cobalt (II)-containing anion having from 3 to 5 cyanide ligands wherein at least one cyanide stretching mode, as measured by infrared spectroscopy, is between 2074 cm^-1 and 2140 cm^-1. Additionally, these complexes have a charge-balancing cation having a molecular volume in excess of 40.ANG.³

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