化工学报 ›› 2007, Vol. 58 ›› Issue (6): 1466-1472.

• 分离工程 • 上一篇    下一篇

模拟的发酵液组分对聚二甲基硅氧烷/陶瓷复合膜渗透汽化性能的影响

徐玲芳;相里粉娟;陈祎玮;金万勤;徐南平   

  1. 南京工业大学
  • 出版日期:2007-06-05 发布日期:2007-06-05

Influence of simulated ethanol fermentation components on pervaporation performance of PDMS/ceramic composite membranes

XU Lingfang;XIANGLI Fenjuan;CHEN Yiwei;JIN Wanqin;XU Nanping   

  • Online:2007-06-05 Published:2007-06-05

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

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