Process for producing gluconic acid by use of bipolar membrane electrodialysis method

一种双极膜电渗析法生产葡萄糖酸的工艺

Abstract

本发明提供了一种双极膜电渗析法生产葡萄糖酸的工艺。其特征在于:葡萄糖酸钠原料先通过袋滤器去除大颗粒的悬浮物,再通过纳滤的方法截留大分子量的污染物,所得的葡萄糖酸钠透过液进入双极膜电渗析膜堆进行循环,回收碱室得到的NaOH和酸室得到的葡萄糖酸;所述葡萄糖酸钠透过液的质量分数为10%-40%,温度为15-50℃,硬度≦30mg/l,悬浮物≦0.5mg/l,电导率为22-30ms/cm,残糖浓度≦0.8%。本发明通过对葡萄糖酸钠原料进行预处理,使预处理后的葡萄糖酸钠指标适用于后续的双极膜电渗析工艺,能达到葡萄糖酸回收率高、能耗低、运行稳定的目的。
The invention provides a process for producing a gluconic acid by use of a bipolar membrane electrodialysis method. The process is characterized in that large-particle suspended solids are firstly removed from the raw material sodium gluconate by use of a bag filter, large molecular weight pollutants are intercepted by use of a nanofiltration method, the obtained sodium gluconate permeate comes into an electrodialysis bipolar-membrane stack to circulate, and finally, NaOH obtained in a base chamber and gluconic acid obtained in an acid chamber are recovered; the sodium gluconate permeate has the mass fraction of 10%-40%, the temperature ranging from 15 DEG C to 50 DEG C, the hardness being less than or equal to 30mg/l, the suspended solid content being less than or equal to 0.5mg/l, the electrical conductivity of 22-30ms/cm and the residual sugar concentration being less than or equal to 0.8%. The raw material sodium gluconate is pretreated so that the indexes of the pretreated raw material sodium gluconate are suitable for the subsequent bipolar membrane electrodialysis process, and the purposes of high recycling rate of the gluconic acid, low energy consumption and steady operation can be reached.

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