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首页> 外文期刊>Separation and Purification Technology >Separation and concentration of lactic acid by electro-electrodialysis
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Separation and concentration of lactic acid by electro-electrodialysis

机译：电渗析法分离和浓缩乳酸

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Reactive extraction combined with a modified two-phase electro-electrodialysis (MTPEED) process shows a strong potential in the recovery and concentration of lactic acid without generating a salt waste. In this paper, an electro-electrodialysis (EED) process was designed with mixed lactic acid and sodium lactate aqueous solution as catholyte to simulate this MTPEED process. The immediate factors affecting the current efficiency, cell voltage and energy consumption were investigated. The optimization of operating conditions was also discussed. The lowest cell voltage was reached when the sodium lactate concentration was about 1.7 mol L~(-1). The current efficiency was kept near 100% before lactic acid in the catholyte was exhausted. When the current density was 160.7 A m~(-2), a representative specific energy consumption of the MTPEED process was 1.404 kWh/kg lactic acid, far lower than 2.961 kWh/kg lactic acid of a comparable EED process with sodium lactate aqueous solution as catholyte. The cell voltage of the MTPEED process was also affected by the phase ratio of the organic phase to the water phase. The lower phase ratio is preferred.
机译：反应萃取与改进的两相电渗析（MTPEED）工艺相结合，在乳酸的回收和浓缩方面显示出强大的潜力，而不会产生盐分浪费。在本文中，设计了一种电渗析（EED）工艺，以乳酸和乳酸钠混合水溶液为阴极电解液，以模拟该MTPEED工艺。研究了影响电流效率，电池电压和能耗的直接因素。还讨论了运行条件的优化。当乳酸钠浓度约为1.7 mol L〜（-1）时，电池电压达到最低。在阴极电解液中的乳酸耗尽之前，电流效率保持在100％附近。当电流密度为160.7 A m〜（-2）时，MTPEED工艺的典型比能耗为1.404 kWh / kg乳酸，远低于具有乳酸钠水溶液的EED工艺的2.961 kWh / kg乳酸。作为阴极电解液。 MTPEED工艺的电池电压还受到有机相与水相的相比的影响。较低的相比是优选的。

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