Poly(urethane-urea) composite membranes with Ag NP/activator and AgBF4/BMImBF4 systems for light olefins/paraffins separations
Membranas compósitas de poli(uretano-ureia) com sistemas de Ag NP/ativador e AgBF4/BMImBF4 para separaçao de olefinas/parafinas leves
Membranas compuestas de poli(uretano-urea) con Ag NP/activador y AgBF4/BMImBF4 para la separación de olefinas/parafinas ligeras
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ABSTRACT: This thesis describe the preparation of Ag NP/activator/WPUU and AgBF4/BMImBF4/WPUU membranes for the separation of olefin/paraffin gas mixtures. In this work, two activator compounds were used for Ag NP, pbenzoquinone (p-Bq) and BMImBF4. The discussion of paraffin and olefin mass transport trough membranes is carried out in the same chapter. The facilitated transport of olefin was not achieved in Ag NP/activator/WPUU membranes, probably caused by the low electron acceptor feature of BMImBF4 and by the poor stability of p-Bq. On the other hand, the facilitated transport of olefins was reached in AgBF4/BMImBF4/WPUU membranes. However, the membrane evidenced a humidification dependence to be stable in long-term permeation experiments. Finally, the overall conclusions of the Thesis and challenges for future researches are presented.