Production of N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid by BMED process using porous P84 co-polyimide membranes

摘要: Abstract Anion exchange membranes are prepared by phase inversion of P84 co-polyimide to obtain porous structure, and then chemically modified branched polyethylenimine. The compared with a dense membrane. membrane is hydrophobic large area resistance (>85 Ω cm2), while the hydrophilic low (2.4–3.5 Ω cm2), lower than that commercial CJMA-3 (6.0 Ω cm2). ion capacities in range 0.83–0.86 mmol/g water uptake values 90–130%, both which higher those (0.5–0.6 mmol/g; 15–20%). utilized bipolar electrodialysis (BMED) process produce N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid (HEPES). can decrease transport HEPES− ions yield high recovery ratio current efficiency, unsuitable for BMED. output HEPES increased significantly if have finger- or tear-like pores, as well capacity. ratios 52.3–61.6% after running 6 h under 40 V, (46.5%). efficiency reach up 86.1% energy consumption only 3.92 kWh/kg using optimal M-1, better (65.5%, 5.15 kWh/kg). Hence, potential producing organic molecular weight.