Abstract:

Hydrophobic polydimethylsiloxane（PDMS）/ceramic composite membrane was prepared and used in the pervaporation of simulated fermentation components.The effects of the common components in ethanol fermentation;such as glucose（polyhydric aldehyde）;glycerol（organic polyol）;succinic acid（organic acid）and KCl（inorganic salts）;on the pervaporation performance of the composite membrane were investigated in detail.The results show that the addition of organic components to the 65 g·L-1 ethanol-water solution has little effect on the pervaporation performance while the addition of inorganic salts（KCl）made a little improvement of separation factor.The PDMS/ceramic membranes exhibited stable performance in these ternary systems with a high flux of 4.5—4.7 kg·m-2·h-1 and an acceptable ethanol/water separation factor of 8.3—10.3 at 333 K.

Key words:

渗透汽化, 聚二甲基硅氧烷, 陶瓷支撑体, 复合膜, 乙醇

摘要：

对所制备的聚二甲基硅氧烷（PDMS）/陶瓷复合膜进行了渗透汽化性能表征。通过在乙醇-水混合体系中添加不同的模拟发酵液组分;如葡萄糖（多羟基醛）、甘油（多元醇）、丁二酸（有机酸）、KCl（无机盐）;考察了各组分对复合膜渗透汽化性能的影响。研究发现：在333 K下;在乙醇浓度为65 g·L-1的混合物中添加不同浓度的第三组分;有机添加物对膜的渗透汽化性能没有明显影响;而无机盐的加入使膜的分离因子稍有提高。所制备的PDMS/陶瓷复合膜;在上述渗透汽化过程中表现出良好的稳定性和对乙醇的优先选择性;渗透通量和分离因子（醇/水）分别在4.5～4.7 kg·m^-2·h^-1、8.3～10.3之间。

关键词:

渗透汽化, 聚二甲基硅氧烷, 陶瓷支撑体, 复合膜, 乙醇