Abstract
This work presents the results concerning the preparation of polymeric membranes from polyethersulfone (PES), and characterization of their behavior in dense CO 2 medium at 23 and 40 °C. The membranes were prepared by coagulation of polymeric solutions at 35 wt.% in a nonsolvent bath, and the effect of temperature of the coagulation bath on membrane characteristics was studied. Each membrane was characterized in terms of permeability to dense CO 2 and retention of poly(ethylene glycol) of average molecular weight 1000 g/mol (PEG 1000). The decrease in the coagulation water bath temperature from 40 to 5 °C resulted in denser membranes, able to retain up to 90% of PEG 1000, but also with smaller permeability to dense carbon dioxide.
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