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相对传统工艺制备葡萄糖酸,采用双极膜法在节能减排、降低生产成本等方面有极大的改善。本文的工业化生产设备为BPM2-2500型双极装置,规格为400 mm×800 mm,装有100组、有效膜面积共有25 m2的双极膜工业化生产设备,35%的葡萄糖酸钠的转化能力为5 t.d-1。该装置在电流密度为500 A.m-2(125 A)稳流的条件下,获得以下较好的结果:葡萄糖酸钠的转化率为98%以上,酸转化能耗为310 kWh.t-1,产酸成本为500元.t-1,远低于传统工艺的600～900元.t-1。如果计算转化每t酸所产生氢氧化钠约200 kg的回用经经济价值,则综合产酸成本低于200元.t-1。本文的成果填补国内双极膜法生产葡萄糖酸工业化应用的空白,也为此工艺的推广打下基础。如果膜成本继续降低、计算氢氧化钠回收价值、计算环保节省的费用、继续优化过程,将有可能实现零成本把葡萄糖酸钠转化成本葡萄糖酸的目标。
Relative to the traditional process of preparation of gluconic acid, bipolar membrane method in energy saving and emission reduction, reduce production costs have greatly improved. The industrial production equipment in this paper is a BPM2-2500 bipolar device with a size of 400 mm × 800 mm and equipped with 100 sets of bipolar membrane industrialized production equipment with an effective membrane area of 25 m2. The conversion capacity of 35% sodium gluconate Is 5 td-1. Under the current density of 500 Am-2 (125 A), the device has the following good results: the conversion of sodium gluconate is above 98%, the energy consumption of acid conversion is 310 kWh.t-1, Acid production costs 500. T-1, well below the traditional process of 600 to 900. T-1. If the conversion of about 200 kg of sodium hydroxide produced per ton of acid is calculated at economic value, the combined acid production cost is less than $ 200.t-1. The results of this paper to fill the blank bipolar membrane production of gluconic acid industrial applications, but also laid the foundation for the promotion of this process. If membrane costs continue to decline, calculating the sodium hydroxide recovery value, calculating environmental savings, and continuing with the optimization process will make it possible to achieve the zero-cost goal of converting sodium gluconate to gluconic acid.