【摘要】 发酵法生产1,3-丙二醇时产生的有机酸盐会对1,3-丙二醇产品的后续提取造成很大困难,尝试采用电渗析方法解决这一问题,并考察了操作电压、淡室流速、浓室初始浓度等操作条件对脱盐效果的影响.实验研究表明,电渗析技术可以有效脱除1,3-丙二醇发酵液中存在的有机酸盐,较好地解决1,3-丙二醇后提取中存在的问题,同时由扩散引起的1,3-丙二醇产品损失率不高于6.0%.经絮凝处理后采用该方法连续脱盐100h发现,发酵液中残存的菌体会对离子膜造成一定污染.更多还原

【Abstract】 Existence of organic salts in PDO solution by fermentation can cause many problems in the purification of PDO.The technology of electrodialysis is tried to solve these problems in this study.The effects of the operaˉtional voltage,velocity of dilute compartment and the initial concentration of salt in concentrated compartment on desalination of PDO are studied.The experiments show that the salts existing in PDO solution can effectively be removed.Meanwhile,the losing fraction of PDO due to diffusion is not more than6.0%during electrodialyˉsis.100hours’continuous experiment shows that thalli in fermentation liquor which was processed by flocculaˉtion in advance will cause the pollution of ion-exchange membranes.更多还原