CuTsPc-SA/CuTAPc-CS双极膜在成对电合成L-半胱氨酸和L-磺基丙氨酸中的应用

Application of CuTsPc-SA/CuTAPc-CS Bipolar Membrane in Paired Electro-generation of L-Cysteine and L-Cysteic Acid

用四磺酸基铜酞菁(CuTsPc)和四氨基铜酞菁(CuTAPc)改性海藻酸钠(SA)阳膜层和壳聚糖(CS)阴膜层,制备了CuTsPc-SA/CuTAPc-CS双极膜(BPM),并以CuTsPc-SA/CuTAPc-CSBPM作为电解槽隔膜,成对电合成L-磺基丙氨酸和L-半胱氨酸。研究结果表明,四磺酸基铜酞菁和四氨基铜酞菁可以促进双极膜中间层水的解离,大大降低膜阻抗和膜电阻压降(即IR降),当电流密度为45mA/cm2时,在1mol/LNa2SO4溶液中,CuTsPc-SA/CuTAPc-CS双极膜的IR降仅为0.3V。综合考虑电流效率和产量两个因素,电合成时电槽的电流密度以35mA/cm2为宜。

The sodium alginate（SA）cation layer and the chitosan（CS）anion layer were modified by copper phthalocyanine tetrasulfonic acid（CuTsPc）and copper tetraaminophthalocyanine（CuTAPc）to prepare the CuTsPc-SA/CuTAPc-CS bipolar membrane（BPM）,which was used as a separator in an electrolysis cell for the paired electro-generation of L-cysteine and L-cysteic acid.Experimental results showed that CuTsPc and CuTAPc promoted water spilitting in the interlayer and greatly decreased the membrane impedance and the IR drop of the modified BPM.The IR drop of CuTsPc-SA/CuTAPc-CS BPM was only 0.3 V in 1 mol/L Na2SO4 solution at 45 mA/cm^2.Based on an overall consideration of current efficiency and yield,the optimum current density during the process of electrolysis was 35 mA/cm^2.