SBS双极膜在成对电解制备葡萄糖酸和山梨醇中的应用

Electro-Generation of Gluconic Acid and Sorbitol in Pairs by SSBS-g-AA/SBS-g-DMAEMA Bipolar Membrane

以SBS(苯乙烯-丁二烯-苯乙烯三嵌段共聚物)作为基膜材料,将SBS磺化后与丙烯酸(AA)自由基接枝聚合,作为阳膜(SSBS-g-AA);在SBS主链上接枝N,N-二甲胺基丙烯酸乙酯(DMAEMA)作为阴膜(SBS-g-DMAEMA);流延法制备了SSBS-g-AA/SBS-g-DMAEMA双极膜(SBSBPM)。用红外光谱、热重分析对膜的成分和热性能进行表征;测定了膜的离子交换容量、I-V曲线和膜阻抗。结果表明,SBSBPM具较低的工作电压和膜阻抗。将SBSBPM作为电解槽隔膜,应用于成对电解制备葡萄糖酸和山梨醇,结果显示,在10mA/cm2的电流密度下电解90min,阴极生成山梨醇的平均产率为86.85%,平均电流效率为91.50%;阳极生成葡萄糖酸的平均产率为84.42%,平均电流效率为88.91%。

Using SBS as a matrix. SBS was sulfonated by 98% H2SO4,then doped acrylic acid （AA） through free radical grafting reaction as the anode membrane （SSBS-g-AA）,and SBS reacted with dimethyl amino ethyl methacrylate （DMAEMA） as the cathode membrane （SBS-g-DMAEMA）,respectively. SSBS-g-AA /SBS-g-DMAEMA bipolar membrane （SBS BPM） was prepared by tape casting. The component and thermal stability of SBS BPM were characterized by infrared spectrum （IR） and thermogravimetric analysis （TGA）. The water contenting rate,ion exchange capacity,I-V curves and impedance of membrane were investigated. It is found that the SBS BPM exhibits lower working voltage and membrane impedance. The SBS BPM is used as a separator in electrolysis cell to produce gluconic acid and sorbitol by paired electrolysis. The experiment results show that with the current density of 10 mA/cm2 for 90 min,the average current efficiency of 91.50% in the anode room and 88.91% in the cathode room are obtained,and the average yield of anode and cathode is 86.85% and 84.42%,respectively.