蒸汽渗透

Abstract(#br)The sorption, diffusion, and permeation properties of toluene and nitrogen from binary gaseous mixtures were studied using polydimethylsiloxane (PDMS) membranes with various cross-linker levels. The prepared PDMS membranes were characterized using X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR), and positron annihilation lifetime spectroscopy (PALS). The PDMS made with 10:1 pre-polymer/cross-linker ratio contained a negligible amount of unreacted cross-linker.

Abstract(#br)Vapor permeation (VP) is applied to be integrated with ethanol fermentation as an in situ product recovery technique which could avoid the ethanol inhibition in this study. The polydimethylsiloxane o(PDMS) membrane is used in separating ethanol from model ethanol/water mixture and fermentation integrated processes. And the performance of VP-fermentation process is investigated and compared to that of Pervaporation (PV)-Fermentation and batch fermentation processes. Experimental results show that the ethanol removal is successfully achieved, while it still suffers low flux.