کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
624705 | 1455406 | 2012 | 7 صفحه PDF | دانلود رایگان |
We investigated nano silica/PVA composite membranes to propose an improved caprolactam pervaporation (PV) dehydration process. The membranes were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray diffraction, and contact angle measurement. Compared with the pure PVA membranes, the nano silica/PVA composite membranes showed different surface morphologies with enhanced hydrophilicity because of their unique formation. To evaluate PV performance and mechanism, we assessed the permeation flux, separation factor, diffusivity/sorptivity selectivity, and activation energy of the composite membranes. The evaluated results indicate that the nano silica/PVA composite membranes induced a breakthrough in the dehydration of a caprolactam-water mixture with a maximum flux of 3.8 kg m− 2 h− 1 and an acceptable separation factor of 150.
► We used nano silica/PVA composite membranes in caprolactam PV dehydration process.
► We achieved maximum flux on the industrial applications level (3.8 kg/m2h).
► Diffusivity /sorptivity selectivity were evaluated.
► We clarified the contribution of intrinsic membrane properties on PV performance.
Journal: Desalination - Volume 285, 31 January 2012, Pages 39–45