Archive

Year

Volume(Issue)

Issues

مرکز اطلاعات علمی SID1
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Scientific Information Database (SID) - Trusted Source for Research and Academic Resources
Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    -
Measures: 
  • Citations: 

    2
  • Views: 

    3081
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 3081

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 2 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Title: 
Author(s): 

Issue Info: 
  • Year: 

    0
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    -
Measures: 
  • Citations: 

    0
  • Views: 

    2741
  • Downloads: 

    0
Keywords: 
Abstract: 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 2741

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    1-7
Measures: 
  • Citations: 

    1
  • Views: 

    2247
  • Downloads: 

    841
Abstract: 

C6-C8 fraction of distillation tower of petroleum refinery, with commercial name A W-406, is a solvent with boiling point about 60 to 80°C which composed of chain and cyclic hydrocarbons. It has many different applications in chemical, food industries and as a thinner in lacquers, paints and brighteners. In this work, removal of benzene from A W-406 solvent by liquidliquid extraction has been studied .In this regard the efficiency of some polar organic solvents and important parameters such as type of solvent, amount of solvent, number of extraction stages and the composition of transferred components into organic layer were investigated. Extraction solvents including dimethylsulfoxide (DMSO), sulfolane, buthyleneglycol (BuG), ethanolamine(EA), diethanolamine (DEA), tetraethyleneglycol (TEG), ethyleneglycol (EG), furfurylalcohol (FA), tetrahydrofurfurylalcohol (THFA) were tested in the present study. The samples analyzed by GC-MASS in optimum conditions. THFA showed best results in benzene removal.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 2247

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 841 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 1 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    9-17
Measures: 
  • Citations: 

    6
  • Views: 

    1669
  • Downloads: 

    730
Abstract: 

Humic acid as a natural polymer with hydrogen sites of the carboxyl-benzioc and phenolic groups (cationic exchange location) was extracted from forest soil by IHSS (International Humic Substance Society) method by using 0.5 M NaOH and 6 M HCI and was then purified in the presence of 0.3 M HF and 0.1 M HCI. The total cationic exchange capacity and cationic exchange capacities of each functional were determined by the potentiometric titration method in the presence of 0.2 M NaOH in medium aqueous. Fixation of metal ions of lead, cadmium and nickel on humic acid was carried out by stablizing ionic strength in different pH by batch method. The amount of fixed metal ions was measured by atomic flame absorption technique. Regarding the low detection limit of method for the metal ions the obtained results are in the following order:Ce (Pb+2)=1.2747 mol/kg MD> Ce(Cd+2) =1. 0989 mol/kg M . D> Ce(Ni+2)=0.967 mol/kg MD. In another study by potentiometery titration method of 0.2 M NaOH, the cationic exchange capcity of humic acid to metal ion of lead, cadmium and nickel was calculated. These results are in complete accordance with the ones obtained by batch method. From this project indicated that the cationic exchange capacity of humic acid depended on hydrate radius of cation concentration and strength ionic and pH of solution. Distribution coefficient shows this method could be a useful technique to remove metallic pollutants from the environment.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1669

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 730 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 6 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    19-35
Measures: 
  • Citations: 

    0
  • Views: 

    1431
  • Downloads: 

    586
Abstract: 

The progressive motivation around improvement of process plants has led to the development of numerous planning and scheduling optimization formulations. The present article has provided a new and extended modeling scheme for determining an optimal scheduling production of mixed continuous-batch working plants. Although, several models have been presented for scheduling of batch plants, less attention has been paid for mixed batch and continuous ones. The novelties in the present paper cover this important issue through the extension of previous works of associated researchers with emphasis on materials intervention in storage tasks.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1431

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 586 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    37-49
Measures: 
  • Citations: 

    0
  • Views: 

    2748
  • Downloads: 

    436
Abstract: 

Electrochemical studies of button type and rechargeable bipolar alkaline batteries have revealed that the main problem in achieving acceptable capacities and high number of charge/discharge cycling is the unsuitable anodic zinc composition. To overcome this, a special kind of electrolytic zinc was coated with tin/zinc alloy, which was employed in the zinc anode. For this purpose, a dual-bath technique was employed repeatedly via electrolytic precipitation of porous zinc and Sn/Zn alloy. Electrochemical impedance spectroscopy and cyclic voltammetric studies were carried out to investigate the electrochemical properties of the as-prepared materials.In addition, the amount of hydrogen gas evolution was measured as a result of corrosion reactions. Results show the beneficial reversibility and enhanced electrochemical properties of doped zinc with Zn/Sn alloy compared to pure zinc powder. Results of laboratory test batteries have revealed that usage of modified anodic composition enhances the electrochemical features of button batteries and improves the cycle performance of rechargeable alkaline batteries.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 2748

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 436 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    51-70
Measures: 
  • Citations: 

    0
  • Views: 

    1960
  • Downloads: 

    786
Abstract: 

In this research, effect of electroplating parameters such as etching time of base metal, bath temperature, and current density on some properties of hard chromium coating; such as hardness, thickness, and surface morphology, has been investigated. ST37 carbon steel with 0.17% carbon content, from low carbon steel grade, has been selected as the base metal of coats. Surface of the specimens were etched at different times; 20, 30, 40 seconds, prior electroplating. The specimens electroplated by hard chromium under different conditions of bath temperature (30, 40, 50, and 60 °C) and current density (15, 25, 35, and 45A/dm2). The results showed that increasing of current density increases the hardness, deposition rate (thickness) of coating, but increasing of bath temperature decreases coating hardness and deposition rate. Hardness of deposit decreases as etching time of the base metal increases. It seems that variation of etching time doesn't have significant influence on deposition rate. Crack free hard chromium deposit is obtained at 50 °C and 25A/dm2 deposition bath and variation of etching time doesn't any influence on producing of crack free hard chromium deposit.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1960

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 786 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    71-81
Measures: 
  • Citations: 

    0
  • Views: 

    2528
  • Downloads: 

    710
Abstract: 

With respect to the development of gas network countrywide and significant reduction of kerosene consumption as domestic fuel, and vice versa increasing gasoline consumption rate, this study were carried out to determine using kerosene in order to increasing production of gasoline and gas oil in Iran refineries and in this special case Tehran refinery. Several mixtures of gasoline were made using Tehran refinery commercial gasoline with platformated lighter cuts of kerosene such as IBP-210 °C and IBP-225 °C cut (separatly), Heavy Straight Run Gasoline (HSRG) and blending naphtha. All mixtures were tested for determination of key characters and compared with NIOC standards as well as motor and emmision tests. As an immediate action for increasing produced gasoline, as a result of this project, without any process modification, two mixtures of IBP-225 °C isomax kerosene cut in low percentage and platform ate gasoline with different ratios were prepared and investigated. Also possibility of kerosene heavy end cut with commercial gas oil, to increase gasoil production, was evaluated which was found to be possible. Some produced gasoline (mixture) in comparison with Tehran refinery commercial gasoline and imported gasoline show good results and in some cases even better than referenced gasolines. Hence minor modification in refining processes can result significant increase in gasoline and gas oil production and consequently resolve the importing of gasoline.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 2528

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 710 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 1
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    83-92
Measures: 
  • Citations: 

    0
  • Views: 

    1224
  • Downloads: 

    276
Abstract: 

Gas injection and dynamic miscibility displacement is one of the most common mechanisms of tertiary enhanced oil recovery. In gas injection, conditions can be approached to miscibility by increasing pressure or adding intermediate components (C2-C5) into gas. At a constant pressure, minimum percent of these intermediate components that should be added into gas to reach miscibility in condensing conditions, is called Minimum Miscibility Concentration or Composition (MMC). The purpose of this experimental study is measurement of minimum miscibility concentration or composition or concisely MMC of enriched injected gas resulted from injection into oil Band final oil recovery percent determination. In this experimental study, gas A with methane 85 mole% was used and gas associated with gas condensate was added for its enrichment with different ratios. MMC of gas A was determined for injection into B reservoir oil in reservoir conditions (pressure: 4100 psi and 215° F). Also all of produced fluid properties were measured, before and after break through time, and was observed that after break through time, density and gas oil ratio of produced fluid density and also composition of outflow gas had noticeable variations.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1224

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 276 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    93-104
Measures: 
  • Citations: 

    0
  • Views: 

    1228
  • Downloads: 

    235
Abstract: 

Coning is used to describe the flow of water or gas towards a producing well. Coning is an unwanted phenomenon which increases production costs and decreases the efficiency of reservoir oil recovery. This phenomenon limits the oil production flow therefore, it is important to control the oil production flow within the range that no water or gas flow through the producing well. Study of coning phenomenon in overall studies and modeling of reservoir is considered here.A simple model based on well specifications and flow towards it, is presented here to save time and decrease costs for study of coning phenomenon. In this paper, based on LMPES method, coning is modeled and compared with the output results from CMG, it has acceptable error and has been found that production flow plays a key role in producing water. Sensitivity analysis on matrix and fracture porosity shows that breakthrough time is more sensitive to the fracture porosity; also, water cut is more sensitive to the matrix porosity. By performing sensitivity analysis on fracture and matrix permeability it has been found that breakthrough time is more sensitive to the vertical and horizontal permeability of the fracture and water cut depends mainly on horizontal permeability of fracture. Finally, results obtained from simple model for well is compared with CMG output.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1228

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 235 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    105-111
Measures: 
  • Citations: 

    2
  • Views: 

    3084
  • Downloads: 

    345
Abstract: 

In this investigation, using copper source; Cu(NO3)2.3H2O and by employing sol gel technique consist hydrolyze and polycondensation steps of TEOS and determination of total molar ratio of component, H2O/TEOS = 6.2, ETOH/TEOS= 1.3, copper ions are doped on the silica matrix. Copper oxide particles are produced from decomposition of copper nitrate by thermal treatment that finally is doped on the silica matrix. Using FT IR, Uv vis spectroscopy and X raydiffraction (XRD), the effect of copper species and oxidic support were analysed Average particle size were determinated about 180-200 nanometer by TEM micrograph too. The loss of water "and hydroxyl groups have changed optical properties of copper ions in silica matrix that are observed as variation of monolite color and spectroscopic properties.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 3084

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 345 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 2 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    113-121
Measures: 
  • Citations: 

    0
  • Views: 

    1676
  • Downloads: 

    669
Abstract: 

The Vapour Extraction (VAPEX) process, a solvent-based enhanced oil recovery process which has a mechanism similar to the steam-assisted gravity drainage (SAGD), has taken considerable attention in recent years. This method can be applied to heavy oil reservoirs with high viscosity and low API gravity. Light hydrocarbons (propane and butane) are used as solvents in this process. The upgraded oil is produced by its gravity in this process. Such characteristics as low energy consumption, low environmental pollution, in-situ upgrading of heavy oil, lower capital costs, make the process superior over thermal EOR methods. In this work, the solvent-based EOR processes are introduced. Then, the performance of VAPEX process is studied by simulating the process in a 2-D system. Such parameters as solvent injection rate and solvent diffusivity into heavy oil are studied.Simulation results show that at high pressure conditions, optimum injection rate should be used.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1676

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 669 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    123-132
Measures: 
  • Citations: 

    0
  • Views: 

    1557
  • Downloads: 

    434
Abstract: 

Exergy analysis is a method that can discuss the quality and quantity of energy in a chemical process. In this article, the exergy loss in a ammonia production plant is calculated. This process uses natural gas as the feedstock and consists of three main parts: syn gas production, CO2 absorption, and ammonia synthesis. For simulation of the process, Design II and Aspen plus software’s were implemented. The exergy efficiency of various units of the process was analyzed. Two methods for increasing the overall exergy efficiency are suggested. The first one is the reduction of co and CO2 concentrations to the mechanize unit. The second suggestion for increasing the overall exergy efficiency is to install a reboiler on the feed tray of the stripping column of the CO2 absorption unit.Based on the obtained results, the first suggestion can increase the exergy efficiency of the process by 0.83%, which is equivalent to 1.8 MW exergy loss reduction. The second proposed method can decrease the exergy loss of the CO2 absorption unit by 7.2%, equivalent to 0.865 MW.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1557

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 434 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    133-140
Measures: 
  • Citations: 

    0
  • Views: 

    902
  • Downloads: 

    592
Abstract: 

Kinetic study of dehydrogenation of isobutane to isobutene was investigated on Pt-Sn supported on g-Al2O3 as catalyst using a tubular quartz glass reactor at atmospheric pressure and a temperature range of 425-575 cc. Different rate models were extracted by considering different elementary reactions of a probable mechanism as rate controlling step and the experimental results. The adsorption and kinetic coefficients were obtained by the Levenberg-Marquardt non-linear regression applied to the reaction rate equations using the experimental results. Results from statistical investigation of the models and comparison of their error percentages indicate that a power law rate equation is in a good agreement with the experimental data obtained at 575°C.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 902

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 592 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Author(s): 

BAGHALHA M. | BADRI N.

Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    141-147
Measures: 
  • Citations: 

    0
  • Views: 

    1672
  • Downloads: 

    645
Abstract: 

Adsorption of metal ions Cu(II), Zn(II) and Cr(VI) on SDDC (sodium diethyl dithiocarbamate)- modified activated carbon in an adsorption column were kinetically modeled in this article. Two types of activated carbons, regular and modified, were considered. For this purpose, the experimental data of Monser and his co-worker for adsorption of metal ions on those two types of activated carbons were adopted. The kinetic modeling of these systems shows that the intra-particle diffusion of the ions is the controlling mechanism for their adsorption on activated carbon. The effective diffusion coefficients of all three ions in the regular activated carbon were calculated as 2.25 x 10-12 m2/s. The effective diffusion coefficients of those three ions in SDDC-modified activated carbon were found to be 50% higher than those in the regular activated carbon.

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 1672

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 645 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 0
Issue Info: 
  • Year: 

    2007
  • Volume: 

    26
  • Issue: 

    3
  • Pages: 

    149-158
Measures: 
  • Citations: 

    0
  • Views: 

    3824
  • Downloads: 

    858
Abstract: 

Nowadays, application of polymers is of most common and economical methods to improve viscosity index of engine oil. Polymeric additives ethylene-propylene diene monomer, which belongs to olefin copolymers family, is applied to improve viscosity of engine oil in this paper, effects of different values of such a polymer on engine oil is evaluated in a comparative way Using full experimental design method, various amount of additives was added to base oil HVI-SN 150 during 16 experiments carried out in mixing reactors. Formulated oils were tested by VI, CCS and SSI and results were analyzed. Experiments were focused on achievement of samples with proper VI and high shear stability. The best function at low operation temperatures. Hence, best index of samples were compared to engine oil produced by domestic and foreign manufactures. Results show that increment in amount of ethylene-propylene diene monomer causes VI to increase. Also result revealed that dimethyl amino ethyl metacrylate improved VI more significantly rather than hydroxyethyl metacrylate. 

Yearly Impact: مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

View 3824

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesDownload 858 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesCitation 0 مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic ResourcesRefrence 1