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- 저자 : Tongwen Xu (검색결과 2 건)
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Removal of heat stable salts (HSS) from spent alkanolamine wastewater using electrodialysis
Yaoming Wang,Wei Li,Haiyang Yan,Tongwen Xu 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.57 No.-
The formation of heat stable salts (HSS) is a tough problem for aqueous alkanolamines solution in gasprocessing industry. In this study, a self-made electrodialysis stack was assembled to remove the HSSfrom spent amine wastewater. Results indicated that the optimum current density is 15 mA/cm2. Anincrease in pH is beneficial for amine recovery but is harmful to the lifespan of membranes. The EDprocess cost is estimated to be 14.6 $/t with the energy consumption of 39.4 kWh/T. Comparison with theconventional neutralization or replacement methods, ED is not only energy-saving but alsoenvironmentally friendly for the removal of HSS from the spent amine wastewater.
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Seo, Seok-Jun,Woo, Jung-Je,Yun, Sung-Hyun,Lee, Hong-Joo,Park, Jin-Soo,Xu, Tongwen,Yang, Tae-Hyun,Lee, Jaeyoung,Moon, Seung-Hyeon Royal Society of Chemistry 2010 Physical chemistry chemical physics Vol.12 No.46
<P>Interfacial resistances between the polymer electrolyte membrane (PEM) and catalyst layer (CL) in membrane-electrode assemblies (MEAs) have yet to be systematically examined in spite of its great importance on the fuel cell performance. In order to investigate ionic transport through the PEM/CL interface, the symmetrical impedance mode (SIM) was employed in which the same type of gas was injected (H<SUB>2</SUB>/H<SUB>2</SUB>). In this study, the ionic transport resistance at the interface was controlled by the additionally sprayed outer ionomer on the surface of each CL. Effectiveness of the outer ionomer on ionic transport at the interface was quantitatively explained by the reduced contact, proton hydration, and charge transport resistances in the SIM. To characterize the ionic transport resistance, the concept of total resistance (<I>R</I><SUB>tot</SUB>) in the SIM was introduced, representing the overall ohmic loss due to proton transport in an MEA. This concept was successfully supported <I>via</I> an agreement of the interpretation and the linear correlation that was obtained between the admittance (1/<I>R</I><SUB>tot</SUB>) and the performance of a fuel cell in the ohmic loss region. This correlation will enable researchers to predict the performance of a fuel cell under the influence of proton transport by examining the <I>R</I><SUB>tot</SUB> in the SIM.</P> <P>Graphic Abstract</P><P>The ionic transport at PEM/CL interface was examined using hydrogen-SIM. The proposed concept was successfully supported by the novel correlation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0cp00662a'> </P>
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