直接接触式膜蒸馏活化能的研究

The activation energy of direct contact membrane distillation

利用聚偏氟乙烯(PVDF)、聚四氟乙烯(PTFE)、聚丙烯(PP)3种疏水性平板膜,各取3种孔径,进行直接接触式膜蒸馏(DCMD)纯水实验,考察了进料流量、膜结构、膜材料等因素对DCMD表观活化能和指前因子的影响。实验结果表明:随着进料流量的增加,表观活化能和指前因子降低。综合考虑膜材料、膜孔结构等因素的影响,较大孔径的PTFE膜具有最好的膜蒸馏性能。

Three kinds of pore size of hydrophobic fiat membranes （PVDF, PTFE and PP） have been used for the direct contact membrane distillation （DCMD） of pure water. The effects of varying the feed flow, membrane struc- ture, and membrane material on the apparent activation energy and pre-exponential factor of DCMD were investigated. The experimental results showed that the apparent activation energy and the pre-exponential factor decreased with increasing feed flow rates, and they were also affected by the membrane structure and membrane material. Based on the activation energy data, the PTFE film with a large pore size showed the best performance in membrane distillation.