1,3-丙二醇发酵液离子交换耦联电渗析脱盐的中试研究

Studies on the Ion Exchange Coupling with Electrodialytical Desalination of 1,3-Propanediol Fermentation Broth at Pilot-Plant Level

对1,3-丙二醇发酵液离子交换耦联电渗析脱盐工艺进行了初步研究,在发酵液小试脱盐研究的基础上,主要研究了电渗析脱盐实验、离子交换树脂的选型和离子交换耦联电渗析工艺。结果表明,单独采用电渗析脱盐1,3-丙二醇损失率为11.41%;通过比较多种阴阳离子交换树脂的pH、电导率以及处理能力,确定耦联中试实验采用树脂LSI296和LSI010;采用离子交换耦联电渗析两步脱盐,效率提高到96.2%,损失率降低到5.88%。

The desalination of fermented broth containing 1,3-propanediol by ion exchange coupling with electrodialysis was studied. Based on the laboratory-scale desalination experiment, the electrodialytical desalination,ion exchange resin, and the coupling process were also investigated. It is shown that the 1,3-PDO loss was 11.41% by electrodialysis. Among the various cationic and anionic resins,LSI296 and LSI010 were chosen to be used at pilot level by comparing pH, conductivity and exchange volume. The efficiency of desalination was improved to 96. 2% , and the loss of 1,3-PDO was decreased to 5.88% by ion exchange coupling with electrodialysis.