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- 저자 : Leila Vafajoo (검색결과 2 건)
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Leila Vafajoo,Houman Savoji,Roozbeh Fayal,Ali Baghaei 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.8
A tanks-in-series model was applied for mathematical modeling of the unsteady state performance of 70and 100 liters airlift bioreactor for the production of lactic acid by fermentation. A set of first-order differential equations for the material balances of micro-organism, substrate, product, and dissolved oxygen around hypothetically well mixed stages was solved simultaneously utilizing computer program in MATLAB. The kinetic model utilized considered the effect of two substrates (glucose and dissolved oxygen) on the growth rate. The effect of air velocity on the lactic acid production was investigated. Results of this model have been validated with experimental data.
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Preparation of Co–Mo supported multi-wall carbon nanotube for hydrocracking of extra heavy oil
Mohsen Rahimi Rad,Alimorad Rashidi,Leila Vafajoo,Maryam Rashtchi 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
In this study, multi-wall carbon nanotube (MWCNT) supported Co–Mo nanocatalysts with changes insynthesis steps, one and two-step, were prepared through impregnation to be used in extra heavy oilhydrocracking process. In both of the synthesized nanocatalysts, the Co/Mo weight ratio was 1/3. Thenanocatalysts were characterized by scanning electron microscopy (SEM), transmission electronmicroscopy (TEM), X-ray diffraction (XRD), and accelerated surface area and porosimetry (ASAP)methods. The results showed that the nanocatalysts prepared through a two-step impregnation methodhad higher surface area and pore volume than the other synthesized nanocatalysts. The nanocatalysts were used in hydrocracking process under mild operating conditions, 260–300 ℃and at H2 initial pressure of 5 MPa. Hydrocracking of extra heavy oil was conducted in an autoclavereactor. The results indicated that both nanocatalysts were capable of hydrocracking heavy oil at mildoperating conditions. However, the nanocatalysts synthesized through the two-step impregnationexhibited higher performance, better heavy oil to light oil conversion, and better sulfur removal than theother methods. This superiority is due to the nanocatalyst’s structure and better distribution of metalclusters on the support.
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