Membranes, Volume 11, Issue 12
2021 December - 92 articles
Cover Story: Water-based solutions of sodium salts of naphthenic acids usually include an excessive alkali, resulting in a high pH value. Bipolar electrodialysis can convert sodium naphthenates into naphthenic acids, but up to a pH of 6.5, the decrease in pH is due to the removal of alkali, which implies that some part of electricity is wasted. Additionally, naphthenate anions strongly bind with anion-exchange membranes, reducing their conductivity to zero. This work proposes bilayer membranes with better electrical conductivity, a higher current efficiency for hydroxyl ions, and a lower tendency to be poisoned than commercial membranes. Modified membranes enable the removal of excess alkali in conventional electrodialysis modules, thus reducing the operational and capital costs of processing the sodium naphthenate solution.View this paper - Issues are regarded as officially published after their release is announced to the table of contents alert mailing list .
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