1,3 丙二醇发酵液电渗析法脱盐

对1,3 丙二醇发酵液电渗析法脱盐的工艺进行了初步研究，主要就发酵液电导率与温度的关系、膜对电压、发酵液过滤与絮凝预处理、发酵液初始pH对脱盐效果的影响及膜的重复使用性进行了研究. 结果表明，发酵液电导率与温度呈线性关系，电导率温度校正系数为0.0217；膜对电压1.3~1.5 V为较适操作电压；脱盐过程耗时越长，1,3 丙二醇的损失越大；发酵液通过壳聚糖絮凝预处理后可以明显改善脱盐效果；发酵液pH对脱盐有明显影响，pH越低脱盐速率越快，膜连续重复使用15批次后性能下降明显，需要用NaOH和NaCl溶液进行清洗.

Desalination of Fermented Broth Containing 1,3-Propanediol by Electrodialysis

The desalination of fermented broth containing 1,3-propanediol by electrodialysis was studied. The relationship between fermentation broth conductance and temperature, effects of membrane pair voltage, pretreatment with flocculation or filtration, initial pH of fermented broth on desalination, and reuse time of membrane were also investigated. It is found that the conductance of fermented broth is linearly related to temperature, the correct coefficient of temperature is 0.0217; the optimal operation voltage over membrane pair is 1.3~1.5 V, the longer the time taken for desalination, the more loss of 1,3-propanediol, flocculation with chitin will decrease the concentration of protein in broth, then alleviate the fouling process of membrane, and improve the efficiency of desalination. Initial broth pH has a noticeable affection on desalination in the pH range of 5~8, and the lower the pH of broth, the lower the resistance of membrane pair. So adjusting broth pH to an acidic condition will accelerate the rate of desalination. After using 15 times, membranes should be cleaned with NaOH and NaCl solution for the reason of fouling.