توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Oxidation of p–xylenes to terphthalic acids with O2\HNO3 in ionic liquids
نویسنده(ها): ،
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۶
A process for oxidation of P–xylenes to the corespounding diacid in O2\HNO3\ionic liquid [bmim]OMS, wherein the ionic liquid can be successfully recovered and reused for the oxidation of same (different) substrate is described.<\div>

۲Dehydrogenation of propane on promoted Pt catalysts supported on different alumina carriers
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۱۰
Multimetallic Pt–Sn–K\Al2O3 catalyst samples were prepared by sequential impregnation of alumina supports. The θ–Al2O3 support was prepared by heat treatment of γ–Al2O3 sample. The supports were characterized by BET and XRD techniques and a high degree of transformation to θ–Al2O3 was observed. The catalyst samples were tested in a fixed–bed quartz reactor for propane dehydrogenation activity and propylene selectivity under representative industrial conditions. The influence of reaction temperature on catalytic performance was also checked within a range of 570–630 ºC. θ–alumina showed superior properties over γ–alumina as the support, that is; similar catalytic performance at lower loadings of Pt, and lower coke formation tendency were observed on θ–alumina supported catalysts. These were attributed to the less porous nature and lower acidity of θ–alumina compared to γ–alumina.<\div>

۳A Mining Waste as a Catalyst for the Upgrading of a Hardwood Chip Derived Pyrolysis Bio–Oil
نویسنده(ها):
اطلاعات انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۴
A highly acidic bio–oil (pH < 3) produced by the fast pyrolysis of sawmill residue hardwood chips was successfully upgraded using Red Mud bauxite mining wasteoriginating from the Bayer process as the catalyst. The upgrading process proceeds at 365 °C without the addition of external hydrogen and yields astabilized bio–oil with an oxygen content of 3.5 % and heating value of 34 kJ\g compared to 43.1 % and 12 kJ\g, respectively, for the crude oil. Simultaneously,the Red Mud employed as the catalyst is converted from an alkaline (pH > 12) hazardous waste to a partially reduced magnetic neutral gray material with acarbon content of ~ 33 % (w\w) with possible use as an iron ore, iron ore pelletization binder or soil additive. The co–processing of the two waste streams –one from forestry, the other from aluminum mining operations – may thus offerattractive economic and ecologic synergies.<\div>

۴CFD Modeling of Mass and Momentum Transfer in Sea Water Desalination by Direct Contact Membrane Distillation
نویسنده(ها): ، ،
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۱۵
The computational fluid dynamics (CFD) approach was employed to model the direct contact membrane distillation (DCMD) process for desalination of water by Polytetrafluoroethylene (PTFE), Polypropylene (PP) and Polyvinylidene fluoride (PVDF) membranes. Various thermodynamic equations of state including Peng–Robinson (PR), Redlich–Kwong (RK), Soave–Redlich–Kwong (SRK), and van der Waals (VdW) are considered to calculate the partition coefficient for the water concentration in liquid and gas phase adjacent to the membrane. The Peng–Robinson equation of state best fits experimental data. The effects of feed flow rate, feed temperature, cold stream flow rate, and flow direction on membrane performance are examined. The results show that the increase in feed flow rate, and feed temperature decrease the partition coefficient so, increase the permeation flux. An increase in cold stream flow rate results in decreases in temperature polarization and it enhances water permeation. The mathematical model results show that cross–current flow arrangement results in a higher permeation flux in comparison with co–current and counter–current flow arrangements.<\div>
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