高安定性酵素キャリヤ-錯体含有高分子複合膜
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概要
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Composite oxygen separating membrane containing stable oxygen carrier in high concentration was developed.<BR>The "picket fence" porphyrin (Co P), was selected as the oxygen carrier because its steric hindrance group is expected to protect the vacant site for oxygen binding, and also is expected to act as the barrier against the inactivation by dimerization.<BR>The coordination properties of Co P complexed with various polymeric ligand was studied, to prove that, in the solid membrane, only active five-coordinate complex was exclusively formed.<BR>We also found that the highly purified Co P shows the high stability against oxygen for several months in the solid membrane of the polymeric ligand.<BR>In order to obtain the high selectivity of oxygen even at the high upstream oxygen pressure, the high concentration of the carrier in the membrane is required.<BR>However, the membrane with the high carrier concentration is too brittle for the practical use. The strength of the membrane might be improved by forming the composite on the porous support. But every attempt to form the composite of the thin active layer on the organic porous membranes result in the formation of composite membrane with low oxygen selectivities.<BR>Our investigation revealed that if active layer with the high carrier concentration was formed on the surface of the specific porous glass membrane, the composite membrane can afford the high oxygen selectivity (α<SUP>O<SUB>2</SUB></SUP><SUB>N<SUB>2</SUB></SUB>=16), even at the high upstream pressure of the oxygen (76 cmHg).
- 日本膜学会の論文