Abstract

Soluble metal phthalocyanines, e.g. PcFe(OCH 2CF 3) 4 form supramolecular complexes with a cyanoethylated hydroxypropylcellulose polymer (AHC) with nitrile groups on flexible spacers. Composite membranes made from these complexes enrich O 2 or CO 2 from a mixture with N 2 or CH 4, respectively. The complexation is concluded from spectroscopic observations and from differences in membrane properties. The surface structure of the membranes was investigated by AFM. Optimal selectivity and permeability were found with membranes containing phthalocyanines with bulky substituents on the macrocycle and metal ions, which are able to coordinate with the nitrile groups of the polymer. Some fluorinated substituents gave high permeate fluxes. Optimal selectivity values found were 3.5 for α O 2/N 2 and 18 for α CO 2/N 2 . For the feed CH 4/CO 2 swelling effects were observed.

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