Heterogeneous bipolar membranes and their application in electrodialysis

A review: Desorption of CO 2 from rich solutions in chemical absorption processes

“…Bipolar membrane has the ability to produce acid and alkali from corresponding salt (Zabolotskii et al, 2014). Nagasawa (2007) proposed CO 2 recovery from carbonate solutions using an electrodialysis method with a combination of bipolar membrane and ion exchange membrane.…”

Prospects of practical application of hybrid membranes

“…At the same time, it was shown that the preparation of hybrid heterogeneous membranes provides a significant increase in the selectivity and efficiency of some electrically driven membrane processes [56]. Thus, it was shown that the introduction of some oxides into membranes makes it possible to enhance the electrocatalytic dissociation of water and thereby intensify the electrodialysis processes [57]. The authors of [58,59] deposited a thin layer of homogeneous MF-4SC membranes on the surface of heterogeneous membranes used in water treatment and thus prepared materials with improved transport properties.…”

Recovery of H2SO4 and NaOH from Na2SO4 by electrodialysis with heterogeneous bipolar membrane

“…Heterogeneous ion-exchange membranes generally have a higher electrical resistance due to the longer pathway of the mobile ion in the heterogeneous membrane structure and higher probability of leakage of co-ions through water filled gaps in the membrane matrix which results in lower permselectivity. On the other hand, the cost of heterogeneous membrane structures is substantially lower (2-4 times) in comparison with homogeneous BPMs [10]. This allows them to be used in electro membrane processes where the purity of the acids and bases does not play a significant role and the use of homogeneous BPMs is limited due to their high cost.…”

“…However, large-scale industrial plants remain relatively rare [10]. The main reasons for the inadequate use of EDBM relate to shortcomings in the BPMs, which can result in a short useful membrane life, lower output product concentrations, and higher product contamination.…”