Abstract
PDMS membranes were prepared by cross-linking with vinyltriethoxysilane (VTOS) on polyacrylonitrile (PAN) substrate to increase hydrophobicity and improve pervaporation (PV) performance. It was shown that the membranes had high ethanol permselectivity and flux. The effects of cross-linking temperature, the content of cross-linking agent, and feed temperature on PV performance of VTOS cross-linked PDMS membranes were investigated. For 6 wt% ethanol aqueous solution, the PDMS membrane had the high separation factor of 15.5 and total flux 573.3 g·m−2·h−1, respectively, when the feed temperature was 40°C, H-PDMS : VTOS : DBTDL = 1 : 0.2 : 0.02 and cross-linking temperature was 80°C.
Highlights
The production of ethanol as an alternative fossil fuel energy resource has been a subject of great interest so far, because of the uncertainty of petroleum supplies and the finite nature of fossil fuels
The peaks that occur at about 3100 cm−1 and 3744 cm−1 are assigned to the stretching vibrations of unsaturated carbonhydrogen bond and Si–OH
The intensity of the peak from 80∘C PDMS is larger than that from 20∘C PDMS. These results may confirm that H-PDMS cross-linked with VTOS at 80∘C becomes more hydrophobic
Summary
The production of ethanol as an alternative fossil fuel energy resource has been a subject of great interest so far, because of the uncertainty of petroleum supplies and the finite nature of fossil fuels. Pervaporation is a promising separation technique and is becoming recognized as an energy-efficient alternative to distillation and other separating methods for liquid mixtures, especially in cases that the traditional separation techniques are not efficient, such as separating of azeotropic mixtures [5, 6], isomeric components [7], and close-boiling point systems [8]. It can offer advantages in energy savings. PDMS membranes were prepared using the cross-linking agent vinyltriethoxysilane (VTOS) and used for separation of International Journal of Polymer Science
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