Gas separation by networks made from supramolecular complexes of metal phthalocyanines and a cellulose derivative |
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| Institution: | 1. División Académica de Ciencias Básicas, Universidad Juárez Autónoma de Tabasco, Km 1.5 Carr. Cunduacán-Jalpa de Méndez, C.P. 86690 Cunduacán, Tabasco, Mexico;2. Cátedra Conacyt-Universidad Juárez Autónoma de Tabasco, Centro de Investigación de Ciencia y Tecnología Aplicada de Tabasco, C.P. 86690 Cunduacán, Tabasco, Mexico;3. Benemérita Universidad Autónoma de Puebla, Facultad de Ingeniería Química, Ciudad Universitaria, San Manuel, Puebla, C. P. 72570 Puebla, Mexico;4. Benemérita Universidad Autónoma de Puebla, Facultad de Ingeniería, Puebla, C. P. 72570 Puebla, Mexico |
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| Abstract: | Soluble metal phthalocyanines, e.g. PcFe(OCH2CF3)4 form supramolecular complexes with a cyanoethylated hydroxypropylcellulose polymer (AHC) with nitrile groups on flexible spacers. Composite membranes made from these complexes enrich O2 or CO2 from a mixture with N2 or CH4, 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 αO2/N2 and 18 for αCO2/N2. For the feed CH4/CO2 swelling effects were observed. |
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