摘要
以乙醇、乙酸的水溶液为渗透汽化分离对象,将CTAB柱撑蒙脱石作为填充剂,制备了填充型PDMS(聚二甲基硅氧烷)膜,研究填充膜对乙醇/水及乙酸/水体系的渗透汽化分离.结果表明,蒙脱石的吸附特性及其层间柱撑通道可以明显改善PDMS膜的选择性和通量.填充膜分离乙醇或乙酸的分离效果明显不同,对可能存在的渗透汽化分离机理进行了探讨.
In this study, a modified PDMS membrane was prepared by using cetyltrimethylammonium bromide ( CTAB) pillared montmorillonite as a filling material. The primary experimental results indicated that the hybrid membrane gave much better pervaporation performances on the permeate selectivity and flux on the separation of acetic acid and alcohol from their water-rich mixture, respectively. Although the hybrid membrane showed the similar PV characteristics on separation of alcohol over water as the plain PDMS membrane, a big different pervaporation phenomena on separation of acetic acid over water using the hybrid PDMS membrane was observed. A possible pervaporation mechanism on the acetic acid separation was suggested according to the experimental data and the membrane structure.
出处
《环境化学》
CAS
CSCD
北大核心
2005年第4期397-400,共4页
Environmental Chemistry
基金
国家自然科学基金(No.50244021
No.50474045)教育部留学回国人员启动基金资助项目.
