توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Application of He's homotopy perturbation method to boundary layer flow, convection heat and mass transfer over a flat plate
نویسنده(ها): ، ،
اطلاعات انتشار: دوازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۱۲
The problem of forced convection from a horizontal flat plate at high mass transfer rates is presented and the homotopy perturbation method (HPM) is employed to compute an approximation to the solution of the system of nonlinear differential equations. In this
study the set of boundary layer equations is extended by adding the equation of continuity for one species soluble in the flowing fluid and solving the differential equations of continuity, motion, energy and mass so that the concentration profile can be evaluated. It
has been attempted to show the capabilities and applications of the homotopy perturbation method in comparison with the previous ones in solving mass transfer problems. A clear conclusion can be drawn from the numerical and analytical results that the HPM provides highly accurate numerical solutions for nonlinear differential equations. The high acuity is guaranteed in the case that the Schmidt number (Sc) equals one.<\div>

۲COMPARISON OF ONE–DIMENSIONAL AND TWO–DIMENSIONAL MODELING OF CATALYTIC NAPHTHA REFORMING PROCESS IN AXIAL FLOW SPHERICAL PACKED–BED REACTOR
نویسنده(ها): ، ، ،
اطلاعات انتشار: اولین کنفرانس بین المللی نفت، گاز، پتروشیمی و نیروگاهی، سال
تعداد صفحات: ۹
In the present research, the differences between onedimensional and two–dimensional modeling of catalytic naphtha reforming process in axial flow spherical packed–bed reactor (AF–SPBR) have been investigated. After writing the mass, energy and momentum balances, thermodynamic and kineticequations, and auxiliary relations, the reactor has been modeled with Computational Fluid Dynamics (CFD) software. In this modeling, the velocity,temperature, and concentration distribution are considered in both axial and radial directions. The velocity profile is pictured to illustrate the radial and axial movement of the fluid thorough the packedbed of the spherical reactor. In addition, the differences between temperature and concentration distribution of one–dimensional and twodimensional modeling through the radius and the length of the reactor are investigated. The effect of the entrance velocity on the output concentration of naphthene and aromatic in one–dimensional and twodimensionalmodeling is also presented.<\div>

۳Effects of various carbon sources on the produced biodemulsifier by Paenibacillus alvei ARN63 in order to crude oil demulsification
اطلاعات انتشار: چهاردهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۵
Paenibacillus alvei ARN63 as a biodemulsifier–producing bacterium has represented incredible demulsifying ability. The produced lipopeptidebiodemulsifier can be used in crude oil industry as an environmentally friendly(green) substance, containing no toxic component. Due to increase production of biodemulsifier, as a type of biosurfactant, the culture conditions for the strain were optimized. For this goal, the effect of different carbon sources and C\N ratios(carbon concentration) were examined in detail at constant temperature, pH, shaking speed (rpm) and nitrogen source. Biodemulsifier synthesis and cellgrowth were determined via measurement of surface tension and optical density (OD600), respectively. Subsequently, to investigate its demulsificationperformance, the bottle test was carried out. Normal paraffin compounds such as C7H16 and C10H22 and C12H26 favored the synthesis of this biodemulsifier. Thebest results were obtained employing C7H16 as carbon source with C\N ratio of 63.13. The surface tension was reduced (from 62.5 mN\m) to 32.3 mN\m in 72 h, and demulsification ratio reached to approximately 65%.<\div>

۴Simulation of a Novel Combination of Fixed bed and Slurry Bubble Column Reactor Concept for Methanol Synthesis
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۱
In this work, a novel combination of fixed bed reactor and slurry bubble column reactors for methanol synthesis has been proposed. In the first catalyst bed (Fixed bed reactor), the synthesis gas is partially converted to methanol in a water–cooled reactor. In the second rector (Slurrybubble column reactor) which is a gas–cooled reactor, the reaction heat is used to preheat the feed gas to the first bed. in this work, Carbon monoxide injection to second reactor (slurry bubblecolumn reactor) was considered. On the other hand proficiency of two types of industrial dual typemethanol reactor (IDMR) and fluidized–bed membrane dual–type methanol reactor (FBMDMR) are used as a basis for comparison in terms of methanol production, CO and H2 conversions in the same condition. Simulation results show 13.3% and 7.92% enhancement in the yield of methanolproduction in comparison with IDMR and FBMDMR respectively while 10% CO was injected to the slurry bubble column reactor.<\div>

۵Experimental study of Iron–Control Chemicals for High Temperature Sour Gas Wells
نویسنده(ها): ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۰
Iron control agent is an important additive of acidizing. Iron compounds that precipitate during acidizing can reduce reservoir permeability in the critical near–wellbore area. In this study, the applicability of reduction for several ferric ion reducing agents is investigated. Reduction strengths and time duration for complete reduction are determined for all presented ferric ion reducers.Mixtures include ferric ion reducer and various catalysts are prepared and compared with eachother. Thioglycolic acid is determined as the best ferric reducing agent and also potassium iodide as the best catalyst. Therefore, mixture of thioglycolic acid and potassium iodide is more effective among all mixtures. This mixture is compared with commercial reducing agents obtained from BJ service at high temperature and in the presence of hydrogen sulfide. Performance of the proposed mixture is better than the commercial reducing agent. This proposed iron control additive is appropriate for acidizing at high temperature in sour gas wells.<\div>

۶Hydrogen Production Using Liquid Hydrocarbon Cracking through Pulsed DBD Plasma Reactor
نویسنده(ها): ، ، ،
اطلاعات انتشار: هفتمین کنگره ملی مهندسی شیمی، سال
تعداد صفحات: ۱۱
In this present, conversion of a model refinery cut (Naphtha) in a novel pulsed DBD plasma reactor was investigated in laboratory scale using high voltage pulse generator. Continuous hydrocarbons cracking and instant generation of light hydrocarbons (C1–C3 like CH4, C2H4, C2H6 and C3H6,) and H2 were studied at room temperature and atmospheric pressure by using argon as a plasma carrier gas.Finding the optimal design parameters of liquid hydrocarbons cracking was the main purpose of this study. So effect of some process parameters like applied voltage and frequency (applied power) and feed flow rate was investigated on content and quality of products. energy efficiencies, generation of hydrogen, product selectivity, breakdown voltage and etc. were determined and discussed.Results show that, compared with frequency, applied voltage has dominant effect on power consumption. Also higher feed flow rate, increase power consumption.Applied voltage, applied frequency and feed flow rate, all affect the energy efficiency of the plasma reactor. It will increase as the feed flow rate decreases and increase as applied voltage and frequency increase. The best performance in reaching notably high efficiencies was at 7 KV and 18 KHz. In this condition efficiency rise to 79.38 (lit\KWh) for 1ml\min of feed injection.Hydrogen gas concentration was between 30%–60% in the produced gas. The hydrogen output is significantly affected by applied voltage and frequency. The generation rate of the hydrogen gas was 2.76 ml\min for an input energy of 5.38 W with energy efficiency of 51.08 lit\kWh which H2 concentration was 60.3% (maximum).The results showed that pulsed DBD systems are capable for cracking liquid hydrocarbon with high conversion efficiency and are an important piece of technology for replacement refinery cracking operations. It is also a very promising process for the production of hydrogen–rich gas with the important advantage to be free of carbon monoxide thus it can be considered as a high–quality hydrogen production method.<\div>

۷RENEWABLE FUELS VIA BIO–OIL UPGRADING BY PLASMA REACTOR
اطلاعات انتشار: دومین کنفرانس بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۱۲
Lignocellulosic biomass is a promising source of renewable energy and valuable chemicals. The condensed liquid obtained through pyrolysis is popularly called bio–oil. In this article, an atmospheric non–thermal dielectric barrier discharge (DBD) plasma reactor was used as a novel tool for upgrading of bio–oil using 4–methylanisole as a model compound of lignin and production renewable fuels. The influences of different voltage (7, 8 and 9kV) on the performance of the reactor were carefully studied. The reaction network for upgrading of 4–methylanisole was proposed based on the plasma reaction mechanisms and observed distribution of products. It was found that the upgrading of 4–methylanisole involved demethylation, methyl group transfer, and hydrogenation (or dehydrogenation) reactions. It is believed that, in all experiments, phenoxy radical was formed as the primary product of anisole dissociation via electron–attack reactions. Moreover, the most abundant product was 4–methylphenol (p–cresol) which was formed by free–radical reaction between phenoxy and H radicals. The 4–methylanisole conversion was measured with non–thermal plasma leading to the formation of benzene, phenol, 2–methylphenol, 4–methylphenol, 2,4–dimethylphenol, 2,6–trimethylphenol, 4–ethylphenol and trimethylphenol. Results of are presented in the form of specific input energy (SIE), 4–methylanisole conversion and selectivity. The highest 4–methylanisole conversion was observed 0.51. The results imply that the DBD plasma reactor is a promising tool for achieve to fuels via upgrading of bio–oil (4–methylaniole).<\div>

۸METHANOL SYNTHESIS, METHANOL DEHYDRATION AND METHYL CYCLOHEXANE DEHYDROGENATION IN A SINGLE THERMALLY DOUBLE COUPLED REACTOR
نویسنده(ها): ،
اطلاعات انتشار: سومین کنفرانس بین المللی نفت، گاز و پتروشیمی، سال
تعداد صفحات: ۷
In this study, three reactions take place simultaneously in a single reactor; methanol synthesis and indirect DME synthesis used as exothermic sides and dehydrogenation of methyl cyclohexane is applied as endothermic side. Its novelty and motivation is to mix the energy efficient concept of coupling two exothermic with one endothermic reaction. A steady state and heterogeneous mathematical model of the thermally double coupled reactor is used to approximate the performance of the proposed reactor. The results show that in addition to reaching higher methanol productivity in the proposed configuration, DME, hydrogen and toluene, as three additional valuable products, are also produced in a favourable mode.<\div>
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