http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Catalytic activity and characterization of V2O5/γ-Al2O3 for ammoxidation of m-xylene system
설용건,Yukwon Jeon,Sung wook Row,Altansukh Dorjgotov,Sang Duek Lee,Kyeongseok Oh 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.8
An ammoxidation of m-xylene was evaluated in a fixed-bed reactor using V2O5 on various oxides. Catalysts were prepared by wet impregnation method. At first, the loading of V2O5 was varied from 5 wt% to 20 wt% on γ-Al2O3support to estimate the most effective amount of V2O5. Second, the effect of catalyst supports was examined at 10 wt%loading of V2O5. V2O5/TiO2 and V2O5/SiO2 catalysts were employed to compare the ammoxidation reaction with V2O5/γ-Al2O3. Most catalytic activity was observed when γ-Al2O3 was used as a support. Careful characterization was followed by physicochemical techniques, such as BET measurement, X-ray diffraction (XRD), Raman spectroscopy and temperature-programmed reduction (TPR). The results provided the clue that monolayer V2O5 was favorably dispersed on the surface of γ-Al2O3 up to 10 wt%, which led to the highest yield of isophthalonitrile (IPN).
Solvent screening for the separation of ethylbenzene and p-xylene by extractive distillation
주영환,설용건,전유권,Sung wook Row,이기천,Sang-Sun Park,Young-Jong Seo 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
Extractive distillation is one of the most effective processes for the separation of ethylbenzene and p-xylene. The goal was to find single solvents or combinations of multi-solvents with good properties while minimizing the ratioof solvent to feed. The distillations were performed at equilibrium to determine the relative volatility of ethylbenzeneto p-xylene with the extractive solvents under isothermal condition. For a single extraction solvent, 1,2,4-trichlo-robenzene had the highest relative volatility at 1.123. In some cases, combinations of two or three solvents were usedas well as different ratios of solvent to feed to investigate the synergy effect of the mixture solvents. The binary solventmixture of 1,2,4-trichlorobenzene and maleic anhydride (2 : 1) had the best performance with a relative volatility of1.228 at the solvent/feed ratio of 1 : 1. Some of the solvents were further studied at different solvent/feed (S/F) ratios. Selected solvents generally tended to have higher relative volatilities at high S/F ratios, but the operation cost will in-crease. Therefore, it is important to find the proper conditions to optimize the S/F ratio for extractive distillation fromthe industrial point of view.