Separation of Benzene/Cyclohexane Mixtures by Pervaporation Using Poly (Ethylene-Co-Vinylalcohol) and Carbon Nanotube-Filled Poly (Vinyl Alcohol-Co-Ethylene) Membranes
| Autor: | Waseem Sharaf Saeed, Saad M. S. Alqahtani, Hala Zahlan, Taieb Aouak |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Vinyl alcohol
Materials science Cyclohexane Filtration and Separation 02 engineering and technology 010402 general chemistry 01 natural sciences Analytical Chemistry lcsh:Chemistry chemistry.chemical_compound Differential scanning calorimetry pervaporation benzene/cyclohexane mixture mass transfer Benzene carbon nanotubes/poly (ethylene-co-vinyl alcohol membrane 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Separation process Thermogravimetry Membrane lcsh:QD1-999 chemistry Chemical engineering Pervaporation 0210 nano-technology lcsh:Physics |
| Zdroj: | Separations Volume 7 Issue 4 Separations, Vol 7, Iss 68, p 68 (2020) |
| ISSN: | 2297-8739 |
| DOI: | 10.3390/separations7040068 |
| Popis: | Poly(ethylene-co-vinylalcohol) (E-VOH) and carbon nanotube-filled poly (vinyl alcohol-co-ethylene) (E-VOH/CNT) were used as membranes to separate benzene/cyclohexane mixtures by pervaporation technique. To reach this goal, E-VOH and E-VOH/CNT membranes were prepared by solvent casting method and characterized by differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM). The swelling tests were used to study the mass transfer of the benzene/cyclohexane mixture and their pure components. The separation by pervaporation process was carried out at 25 ° C in which the effect of CNTs incorporated into E-VOH matrix and the initial concentration of benzene in the feed on the permeate flux, j, and separation factor, &beta performance was investigated. The results obtained were very promising, in which the integration of CNTs through E-VOH chains increased the absorption area and raised the flux to 740 g/m2∙h. The separation factor increased to 9.03 and the pervaporation separation reached an index of 5942.2 g/m2∙h for the azeotropic mixture during 3 h of the separation process. In contrast, for the unfilled E-VOH membrane, it was found that these parameters were a rise of 280 g∙m&minus 2∙h&minus 1, separation factor of 12.90 and pervaporation separation index of 3332.0 g/m2∙h, under the same conditions. Likewise, the calculation of the performance of the E-VOH/CNT membrane with regard to that of the unfilled membrane indicated 2.64 for the total flux and 0.70 for the separation factor. It was also revealed that the best compromise of the filled membrane in terms of total cumulative flux and separation factor is obtained for the feed containing the azeotropic mixture. |
| Databáze: | OpenAIRE |
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