A theoretical analysis is presented on the unsteady-state measurement of polymer membrane permeability to dissolved oxygen by means of an analyzer fitted with an oxygen electrode. The main conclusions of this analysis are as follows: (i) the oxygen mass balance must take into account the rate of oxygen consumption at the electrode; (ii) the apparent permeability coefficient Q can be derived by the unsteady-state technique provided that the quasi-steady-state condition is fulfilled for the gas transport in the membrane phase; (iii) the true permeability coefficient P can be evaluated by a set of experiments performed on a single polymeric film using the apparent permeability Q obtained at various rates of stirring. © 1989.
The unsteady-state measurement of polymer membrane permeability to dissolved oxygen / L., Nicodemo; Bellucci, Francesco; R. L., Rose; Carfagna, Cosimo. - In: JOURNAL OF MEMBRANE SCIENCE. - ISSN 0376-7388. - STAMPA. - 43:(1989), pp. 177-186.
The unsteady-state measurement of polymer membrane permeability to dissolved oxygen
BELLUCCI, FRANCESCO;CARFAGNA, COSIMO
1989
Abstract
A theoretical analysis is presented on the unsteady-state measurement of polymer membrane permeability to dissolved oxygen by means of an analyzer fitted with an oxygen electrode. The main conclusions of this analysis are as follows: (i) the oxygen mass balance must take into account the rate of oxygen consumption at the electrode; (ii) the apparent permeability coefficient Q can be derived by the unsteady-state technique provided that the quasi-steady-state condition is fulfilled for the gas transport in the membrane phase; (iii) the true permeability coefficient P can be evaluated by a set of experiments performed on a single polymeric film using the apparent permeability Q obtained at various rates of stirring. © 1989.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.