Effect of Number of Bipolar Membranes and Temperature on the Performance of Bipolar Membrane Electroacidification

Abstract

The purpose of this study was to evaluate the effects of stacking bipolar membranes (1−4 BPMs) on the energy and electroacidification parameters, as well as the temperature (10, 20, and 35 °C) on the efficiency of bipolar membrane electroacidification (BMEA) of soybean protein for the production of isolate. BMEA is based on the production of protons by dissociation of water molecules at the interface of bipolar membranes. Increasing the surface of bipolar membranes accelerates the electrochemical precipitation in a quasilinear fashion, while also increasing the electrical efficiency. The stacking has no effect on the final protein precipitation rate. The main effect of increasing the temperature from 10 to 35 °C appears to be a decrease in the duration of the procedure (30.42 vs 26.79 min) as well as increasing the energy efficiency. Increasing temperature slows the precipitation of proteins by decreasing hydrophobic interactions. Keywords: Temperature; bipolar membrane; stacking; electroacidification; soya protein

Effect of Temperature on the Separation of Soybean 11 S and 7 S Protein Fractions during Bipolar Membrane Electroacidification

“…By expressing the energy requirement consumed relative to the production of 1 kg of protein isolate, it is obvious that this process is a low energy process with relative energy consumption of 0.53 and 0.86 kW‚h/kg isolate at 27 and 10°C. These results agree with those obtained by Bazinet et al (1997b), with relative energy consumptions of 0.73, 0.45, and 0.37 kW‚h/kg isolate at 10, 20, and 35°C.…”

“…The module used was an MP-type cell (100 cm 2 of effective electrode surface) purchased from Electrosynthesis Co. Inc. (Lancaster, PA). The cell has the same configuration as that used by Bazinet et al (1997b).…”

Recovery of magnesium and protein from soy tofu whey by electrodialytic configurations

“…These results are in accordance with those in the literature. 4,5 The recovery of Mg from STW was 60.5% during the ED phase in 60 min (Fig 6), con®rming the result obtained by conductivity: the demineralization was performed in a linear fashion during this period (Table 1). During the BMEA step an additional 5% recovery of Mg was achieved.…”

Electrodialysis of calcium and carbonate high concentration solutions and impact on composition in cations of membrane fouling

“…The presence of carbonate influenced the buffering capacity of the solution and then a larger quantity of H + was required from the dissociation of water molecules to lower the pH of the salt solution. This larger number of H + to be electrogenerated to reach the final pH increased the treatment duration [11].…”