不同类型离子交换树脂对填充床电渗析中L-Lac^-和L-Glu^-分离的影响

Effect of Different Ion Exchange Resins on the Separation of L-Lac^- and L-Glu^- in Packed-bed Electrodialysis

通过树脂静态吸附、常规电渗析及填充床电渗析的对比实验,考察了带有不同离子交换基团的树脂对发酵废液中L-Lac-和L-Glu-分离的影响.结果表明,碱性树脂201×7和WA30对2种组分的静态吸附量、L-Lac-/L-Glu-选择吸附比例均比酸性树脂001×1.1和WK10大.与常规电渗析相比,填充001×1.1(强酸型)、WK10(弱酸型)的填充床电渗析体系中L-Lac-和L-Glu-的跨膜迁移量及分离比例均有明显增加,填充001×1.1时分离比例最大可达22.22.填充201×7(强碱型)时两组分跨膜迁移量及分离比例均比常规电渗析小,最大分离比例分别为5.74和8.28.填充不同离子交换树脂体系的能耗对比表明,填充床淡室中填充树脂001×1.1和WK10时可促进L-Lac-和L-Glu-的迁移传递、提高二者的分离比例.

The effect of ion exchange resins with different ionic groups on the separation of L-Lac- and L-Glu- from fermentation wastewater was investigated by resin static adsorption, conventional electrodialysis and packed-bed electrodialysis. The results of static adsorption showed that the selective adsorption ratio of L-Lac- and L-Glu- adsorbed by basic resins （201×7 and WA30） was higher than that adsorbed by acid resins （001 x 1.1 and WK10）. Compared with conventional electrodialysis, the migration quantity and separation ratio of L-Lac- and L-Glu- in the dilute compartments filled with 001xl.1 （strong acid resin） and WK10 （weak acid resin） were obviously higher, the maximal separation ratio could reach 22.22 when the 001×1.1 resin was filled in the dilute compartment of electrodialysis. However, when the basic resins （201×7 and WA30） were filled in the dilute compartment, both migration quantity and separation ratio were lower than those of conventional electrodialysis, the maximal separation ratios of L-Lac- and L-Glu- in the concentrated compartments were 5.74 and 8.28 separately. The migration quantities and separation ratio of L-Lac- and L-Glu- and energy consumption in different electrodialysis systems showed that 001×1.1 and WK10 resins filled in the dilute compartments were beneficial to the separation of L-Lac- and L-Glu- in packed-bed electrodialysis.