توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱CORRELATION OF BUBBLE GROWTH RATE IN SUPERHEATED METHANOL
اطلاعات انتشار: پنجمین کنگره بین المللی مهندسی شیمی، سال
تعداد صفحات: ۱۰
Boiling heat transfer is used most commonly in chemical and petrochemical industries either to generate vapor or because of its high efficiency in cooling. The high efficiency of boiling is contributed to three mechanisms namely the natural convection to the liquid, latent heat flow by micro–layer evaporation between bubbles and heat transfer surface, and the intense micro–convection flow adjacent to the heat transfer surface which induced by growth and detachment bubbles. All these mechanisms are strong function of bubble growth rate and its accurate prediction is crucial for the theoretical prediction of boiling heat transfer coefficient. Unfortunately, the proposed correlations are either simple with a limited range of validity or complicated. In the present work a unified model is presented by solving equation of energy which is expressed by In this article, first the fundamental approach of developing of presented model is discussed. Then the prediction of this model is compared with available experimental data for methanol and with those of better performing correlation from the literature. The absolute average error between the predicated and the experimental data is less than 20% for methanol, which confirms the applicability of the suggested model.<\div>

۲Biodiesel Production from Waste Cooking Oil and Survey Emissions due to Combustion of Biodiesel
نویسنده(ها): ،
اطلاعات انتشار: چهارمین همایش تخصصی مهندسی محیط زیست، سال
تعداد صفحات: ۱۲
Biodiesel is a mono alkyl ester which produced from long chain fatty acids during a transesterification reaction. Biodiesel can be produced from vegetable oils, waste cooking oils and animal fats. Cost of raw materials is one of the main problems of biodiesel's production which has an important role in the production's cost of biodiesel. Fifty to sixty percent of these costs spend on supplies of oil. For reducing the cost of raw materials for biodiesel, waste cooking oil which is collected from Ahvaz Petroleum University of Technology was used. Physical properties of this fuel were measured by Abadan’s refinery. This fuel was burned in the semi–industrial boiler at 6 air to fuel ratios and one pressure and emitted gas of combustion was analyzed by one analyzer and compared with petro–diesel<\div>

۳Comparison of Performance of Comercial Engelhard γ–Al2O3 Catalyst and Synthesized γ–Al2O3 Nano Catalyst for Dehydration of Methanol
اطلاعات انتشار: سومین همایش ملی تحقیقات نوین در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۴
The conversion of methanol to dimethyl ether was carried out over the commercial Engelhard γ–Al2O3 catalyst and synthesized γ–Al2O3 nano catalysts to evaluate their catalytic performances. The activity of each catalyst was examined in the dehydration of methanol to DME using a fixed–bed microreactor at a reaction pressure of 1 barg and WHSV of 15 h–1.The catalysts characterized by XRD technique. The results showed that maximum conversion of reaction was observed at temperature range of 310 to 350 ⁰C and WHSV of 15 hr–1 with methanol conversion of 84% for commercial catalyst and 85% for synthesized catalyst. The commercial catalyst exhibited better stability at the temperature range of 300 to 380 ºC in dehydration of methanol<\div>

۴Comparison of Performances of Nanocatalysts H–ZSM–5 and γ–Alumina for DME Synthesis
نویسنده(ها): ،
اطلاعات انتشار: سومین همایش ملی تحقیقات نوین در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۴
The conversion of methanol to dimethyl ether was carried out over commercial H–ZSM–5 and γ–Al2O3 catalysts to evaluate their catalytic performances. The activity of each catalyst was examined in the dehydration of crude methanol to DME using a fixed–bed microreactor at a reaction pressure of 2barg and LHSV of 15 h_1. The catalysts characterized by XRD technique. The results showed that the H–ZSM–5 exhibited better activity in dehydration of methanol<\div>

۵Configurations and Methods to Improve NGL Recovery
اطلاعات انتشار: دومین کنگره مهندسی نفت ایران، سال
تعداد صفحات: ۹
Several different methods are directed to improve the efficiency and economy of processes for the recovery of natural gas liquids (NGL) from a gas feed, e.g., raw natural gas or a refinery or petrochemical plant gas stream [1]. These methods may be employed with most, if not all, conventional separation methods using a distillation tower, e.g., a demethanizer or deethanizer column. Different processes for the recovery of propane and heavier hydrocarbon components from a hydrocarbon gas steam explained in the patents [1, 2, 3, 4, and 5]. It is desired to have a process, which is capable of recovering propane and heavier hydrocarbon components from a gas steam in which only a minor amount of propane is lost to the residue gas while at the same time rejecting essentially all of the ethane. In this paper the plant data [1] are used. The process is simulated using Hysys software. For maximum propane recovery, the optimum split flow, power consumption for residue gas compression, power consumption for refrigeration cycle, and a trade off for optimum pressure are determined.Accordingly, it is quite common to see the same basic processing scheme used for either ethane recovery or propane recovery, with only the heat exchanger arrangement modified to accommodate the different operating temperatures within the process.<\div>

۶Promotion Effect of Fe on Mo\Al2O3 Catalyst for the CAMERE Process
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۶
Reverse Water Gas Shift (RWGS) reaction is one of the main reactions that can be used to reduce greenhouse gases emissions. Through this reaction CO2 is converted to CO to produce beneficialchemicals such as methanol. In this paper Mo\Al2O3 catalyst was prepared and then promoted withFe ions through co–impregnation method to produce Fe–Mo\Al2O3 catalyst. XRD tests were taken to determine the structure of the catalysts. Activity, selectivity and stability of both catalysts were investigated in a batch reactor and the results indicate that addition of Fe promoter to Mo\Al2O3catalyst increased its activity and CO selectivity. Fe–Mo\Al2O3 showed acceptable catalytic stability during RWGS reaction. As a whole, Fe–Mo\Al2O3 can be a suitable candidate for RWGS reaction in CAMERE (carbon dioxide hydrogenation to form methanol via a reverse–water–gasshift reaction) process.<\div>

۷Screening of ionic liquids for extractive desulfurization
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۹
Ionic liquids were found to be highly selective for extractive removal of aromatic sulfur compounds from fuels at room temperature. The efficiency of ionic liquids for the absorption of aromatic sulfur is dependent on the size and structure of both cations and anions of the ionic liquids.To screen IL solvent for extractive desulfurization, a rigorous criterion considering both its solubility in ther fuel and extractive ability is established. we evaluate the effect of anions and cations and suggest potential ILs meeting the criterion. After screeningof cation and anion, for cation [C4mim] has lowest solubility, the highest separation selectivity and extractive capacity and for anions, [H2PO4], [Cl], [SCN],[HSO4] and [PF6] are highest selectivity and capacity for extractive desulfurization.<\div>

۸Effect Of HNO₃ Treatment of Commercial Activated Carbon on Adsorptive Desulfurization of DBT and 4,6–DMDBT
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۱۰
A commercial activated carbon, with treatment of HNO₃ was investigated as adsorbents of sulfur solutions prepared of n–decane and same concentrations of dibenzothiophene (DBT) and 4,6–dimethyildibenzothiophene (4,6–DMDBT) that varied between 400 and 1600 mg\l. To characterize the initial and modified carbons nitrogen adsorption, x–ray diffraction (XRD) and fourier transform(FT–IR) were applied. surface area and pore volumes were significantly enhanced upon HNO₃ treatment and adsorption capacity for sulfur compounds followed the order: AC < AC–HNO₃. Adsorption kinetics and isotherm studies were performed, and the adsorption data fitted well to pseudo second–order model and Langmuir isotherm model.<\div>

۹Adsorptive Desulfurization and Denitrogenation of Model Fuel
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۱۱
Adsorption of heterocyclic sulfur and nitrogen compounds by aluminosilicate mesostructure (MSU–S) and its modified form with copper oxide were studied using model fuel. The results of characteristic tests (XRD, N2 adsorption–desorption, FTIR and SEM) CuO impregnation leaves a negative effect on mesoporous structure, crystalline phase, and particle shape along with a high positive impact on surface acidity and π–complexation. CuO modification causes about 144.22% and 117.31% increase in adsorption loadings of DBT and BT. For nitrogen compounds adsorption with model fuel, adsorption loadings of quinoline and carbazole increase of 24.49% and 12.73%, respectively. The pseudo–second order model can best fit the kinetics data and Data fitting for carbazole, DBT and BT is achieved better by the Langmuir model than Freundlich model and the data of quinoline are fitted very well to the Freundlich model for CuO–MSU–S.<\div>
نمایش نتایج ۱ تا ۹ از میان ۹ نتیجه