硅橡胶膜用于工业化乙醇连续发酵的实验研究

Experimental Study on a Silicone Rubber Membrane When Used in Ethanol Continuous Fermentation

对本实验室自制硅橡胶膜的分离性能进行了一系列实验研究,探讨其用于工业化乙醇连续发酵的可行性。研究表明,在分离4％～8％的乙醇-水溶液(35℃)时,该膜的平均渗透通量为1100g·(m^2·h)^(-1),最高通量可达1300g·(m^2·h)^(-1),分离因子为6.2～6.8;在连续发酵过程中,该膜表现出良好的性能稳定性,经连续运转300多个小时后,仍无堵塞、无破损,具有很高的机械性能和抗污染能力。连续发酵过程中,发酵工艺条件和膜组件结构对膜的分离性能有一定影响,应注意在这两方面加以改进。

To testing the separation performance of a silicone rubber membrane when used in ethanol continuous fermentation, which made by ourselves in laboratory, a series of experiments were done. The result showed: When separating the 5% - 8% ethanol - water solution (35℃ ), the membrane had a average flux of 1100 g · (m2 ·h) -1 and a maximal flux of 1300 g · (m2 · h) -1, the selectivity fluctuated from 6. 2 to 6. 8. The membrane behaved well during the over 300 hours' ethanol continuous fermentation experiment, and displayed good mechanical performance and strong anti - fouling property. The unsuitable fermentation conditions and membrane module structure forms would debase the membrane' s separation performance to a certain extent and should be improved.