Fatola Farhadi - Academia.edu (original) (raw)
Papers by Fatola Farhadi
![Research paper thumbnail of The Mamasani Archaeological Project, Stage Two: Excavations at Qaleh Kali (Tappeh Servan/Jinjun [MS 46])](https://attachments.academia-assets.com/118149154/thumbnails/1.jpg)
](Iran, 2007
In early 2007, surface survey, geophysical analysis and excavations were carried out at the site ... more In early 2007, surface survey, geophysical analysis and excavations were carried out at the site ofQaleh Kali (Tappeh Servan!Jinjun), in the Mamasani District of Fars. The excavations revealed that multiple phases of occupation are preserved at the site, the earliest of which appears to have been a sizeable elite structure that may in fact have had a royal clientele, as suggested by the presence of monumental Persepolis-style column bases and the quality of the fragments of fine glass and polished stone vessels discovered in the excavations. Although it has not yet been identified with any certainty, it is likely that Qaleh Kali is mentioned in the Persepolis Fortification Texts.
International Journal of Refrigeration-revue Internationale Du Froid, 2017
Scientia Iranica, 2002
... Department of Chemical Engineering, Sharif University of D'ch.nology. ... as [3]: d2 ß g... more ... Department of Chemical Engineering, Sharif University of D'ch.nology. ... as [3]: d2 ß g *<^>" v. (6) The mass transfer coefficient, K at the solid bound-ary layer of a well-stirred solid-liquid system can be calculated from [3]: Ks = D 2 + 0.4(Ksg5p3)025( )°-333 ßs pD (7 ...
Applied Thermal Engineering, 2020
Journal of Natural Gas Science and Engineering, 2020
Journal of Petroleum Science and Technology, Mar 10, 2014
In the present paper, the biodesulfurization of simulated light fuel oil (i.e., dibenzothiophene ... more In the present paper, the biodesulfurization of simulated light fuel oil (i.e., dibenzothiophene (DBT) in dodecane) and untreated kerosene with a high total sulfur content has been studied by a native isolated bacterium named Bacillus cereus HN. The influences of various parameters such as the reaction temperature (T), biocatalyst cell density, oil phase fraction (OFP), and initial DBT concentration on the fractional conversion of the model sulfur compound were investigated. The experimental data obtained were used to determine the reaction rate constant of the model sulfur compound and the corresponding activation energy. Furthermore, the biodesulfurization of untreated kerosene with a total sulfur content of 2333 ppmw produced by an Iranian refinery company (Isfahan refinery) was investigated to examine the capability of this new microorganism. It was realized that about 33% of the total sulfur content of untreated kerosene could be removed after 72 hrs. The results of the response surface methodology (RSM) showed that a quadratic correlation could be proposed for the influences of biocatalyst cell density, OFP, and initial DBT concentration on the desulfurization of DBT.
Separation and Purification Technology, Dec 1, 2021
Abstract To reduce the sulfur content of crude diesel, several sets of experiments have been cond... more Abstract To reduce the sulfur content of crude diesel, several sets of experiments have been conducted using electrochemical oxidative desulfurization technique using electrolyte of NaOH at different applied voltages. Due to impacts of operating parameters on desulfurization, kinetic study is pursued and it is found that the kinetic follows a second order reaction rate with a high accuracy. The reaction of desulfurization was modeled using COMSOL and followed by coupled electrochemical oxidation-extraction, while the extraction process was particularly performed using process simulator. The effects of different solvents on extraction performance were studied and dimethyl sulfoxide was selected for further investigation. Sensitivity of operating and design parameters of solvent flow rate, operating pressure and the number of extraction stage were analyzed by adding new terms into consideration. The new terms of extraction efficiency, oil and solvent recoveries were calculated for each case. The sensitivity analysis showed that low solvent flow leads to high extraction efficiency, while low solvent recovery is obtained. Increasing the number of extraction stages resulted in a higher extraction efficiency and solvent recovery. To find the optimal condition, a multi-objective optimization for extraction process is applied by maximizing extraction efficiency, oil and solvent recoveries at different operating and design conditions. The optimal values were operating pressure of 4 bar, solvent flow rate of 80 kmol/h and ten extraction stages.
International Journal of Hydrogen Energy, Sep 1, 2020
Abstract In this research, a series of NiO-xMgO-SiO2 catalysts with various MgO/SiO2 molar ratios... more Abstract In this research, a series of NiO-xMgO-SiO2 catalysts with various MgO/SiO2 molar ratios were prepared via precipitation method followed by a hydrothermal treatment in the presence of PVP as surfactant. The synergic effect between MgO and SiO2 leading to the various characteristic and catalytic performance during propane steam reforming was investigated in detail. The results showed that 15 wt% NiO-0.5MgO–SiO2 catalyst possessed the highest catalytic activity (68.9% conversion for C3H8 at 550 °C) with a negligible amount of carbon formation after 20 h of reaction duration. This superior catalytic performance can be attributed to the enhanced basicity strength along with strong metal-support interaction due to the formation of NiO–MgO solid solution, as confirmed by CO2-TPD and TPR analyses, respectively. In addition, the maximum hydrogen yield was obtained through the NiO–MgO sample because of higher progress in other hydrogen production routes as opposed to that of the propane steam reforming. It also can be suggested that relatively weak interaction between active sites and support was probably the main reason for unstable catalytic behavior of NiO–SiO2 sample with the lowest activity. This study confirms that the appropriate MgO/SiO2 ratio led to the sufficient metal-support interaction and delicate balance between acidic/basic sites, which was followed by the great activity, and coke resistance during PSR.
Journal of Crystal Growth, Feb 1, 2002
Precipitation is an important stage of the Bayer process. For simulation of this section, growth-... more Precipitation is an important stage of the Bayer process. For simulation of this section, growth-rate estimation of Al(OH) 3 crystals, is vital for the solution of population balance. Various published equations for linear growth rate of Al(OH) 3 are reviewed. In all of these equations, a square exponent was considered for supersaturation terms. In some of the previous works, it was believed that BCF model is the governing mechanism for surface growth of crystals. It is shown that polynuclear model is the most probable mechanism. Also, a modification of the best previous correlation is performed, which results in a considerable improvement of the growth-rate estimation over the available published experimental data.
Separation and Purification Technology, Oct 1, 2020
Abstract Presence of sulfur components in liquid fuels should be controlled due to environmental ... more Abstract Presence of sulfur components in liquid fuels should be controlled due to environmental issues and process considerations. In order to decrease the level of sulfurous compounds in crude gas-oil with 5750 ppmw sulfur, electrochemical oxidative desulfurization has been investigated over electrodes of copper and stainless steel because of their easy operation and mild process conditions. In this research, the effects of stirring rate, temperature, applied potential, sodium hydroxide addition as electrolyte media and water volume have been examined on the sulfur removal efficiency. The results show that electrical conductivity of gas-oil sharply increases with addition of electrolyte up to 613 µs/cm. The results also indicate that the increase in applied potential, temperature, water volume, sodium hydroxide content leads to enhancement of desulfurization efficiency. The response surface methodology has been applied to carry out single and multi-objective optimizations.
Mathematical biosciences, Feb 1, 2019
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights The location of the tubules affects the solutes concentration The boot-shaped prebend segment significantly increased osmolality of collecting duct. Collecting duct osmolality at the end of the IM is 1198 mOsmol/kg H2O which was close to experimental data. Osmolality of tubules at cortico-medullary boundary were lower than blood plasma (~290 mOsmol/kg H2O) and close to experimental data.
Desalination, Mar 1, 2021
Impacts of energy recovery devices, batteries and permeability have been evaluated • The scenario... more Impacts of energy recovery devices, batteries and permeability have been evaluated • The scenario where all the PV power is exported to the grid has the highest NPV • Using energy recovery devices is not economically viable in each scenario • For discount rates higher than 23%, there is no room for PV-RO desalination plants • The worst scenario is the one that uses batteries
Computers & Chemical Engineering, 2023
Iranian Journal of Chemistry & Chemical Engineering-international English Edition, Jun 1, 1989
Two phase gas-liquid flow pattern in a horizontal pipeline is predicted very accurately using a n... more Two phase gas-liquid flow pattern in a horizontal pipeline is predicted very accurately using a newly-developed analytical relation. The pattern identification is based on one of the most widely used graphs, the Baker diagram, modified in a way that compensates for the unrealistic oversimplifications of recent works. The Kern's method of pressure drop calculation is used to obtain the frictional pressure drop in a gas-liquid pipeline flow. An interactive computer program is developed for the prediction of the flow pattern and calculation of pressure drop.
International Journal of Environmental Science and Technology, Jan 26, 2021
To propose a conceptual arrangement of reverse osmosis desalination plants, four comprehensive de... more To propose a conceptual arrangement of reverse osmosis desalination plants, four comprehensive decision algorithms and a software are developed. Typically, commercial software predict the performance of the reverse osmosis membranes based on their pre-determined configuration; however, the developed decision algorithms and the developed software in this study have the capability of introducing the conceptual arrangement of pretreatment units, reverse osmosis membranes, and energy recovery devices for both seawater and brackish water reverse osmosis plants. To perform a comprehensive study, alongside the developed software and the decision algorithms, both design considerations of the required equipment in pretreatment units and mathematical modeling of reverse osmosis membranes are included. Finally, to validate the accuracy of the developed decision algorithms and the software, four installed reverse osmosis desalination plants for producing drinking water from seawater and brackish water feeds are investigated. The algorithmic proposed plants for all four cases were in close agreement with the implemented industrial cases and World Health Organization standards.
Journal of Chemical and Petroleum Engineering, 2017
Separation of a racemic mixture of ibuprofen at a low concentration level by supercritical fluid ... more Separation of a racemic mixture of ibuprofen at a low concentration level by supercritical fluid chromatography in a simulated moving bed (SFC-SMB) is investigated by simulation. The feasibility of ibuprofen enantiomers separation has been experimentally examined in the literature. Our simulation results show that separation of ibuprofen enantiomers is feasible by this method, and R-ibuprofen and S-ibuprofen products with purity of over 99% can be obtained, which agrees with experimental data in the literature. For initial studies, the triangular theory is used to find the operating conditions. This simulation shows that the application of the triangular diagram is valuable in cases where none of the operating conditions is available. The operating point conditions, such as streams flow rates and switching time, are obtained with this method. Also, the effect of the location of the selected operating points in the triangular diagram on operating conditions, purity, and concentration...
This paper investigates the economic feasibility of installing a turboexpander in parallel with t... more This paper investigates the economic feasibility of installing a turboexpander in parallel with the throttling valve of a city gate station for the purpose of distributed electricity generation through exergy recovery from pressurized natural gas. The preheating requirements for preventing hydrate formation due to pressure reduction are provided by the combustion of a small fraction of the outlet natural gas stream. As a case study, the simulation of Tehran No.2 City Gate Station demonstrates an exergy loss of more than 36.5 million kWh per year for the present throttling valves. Thermoeconomic analyses gives the optimum operating conditions for electricity generation through a turboexpander. Optimization of preheating temperature leads to an exergy recovery of >60%, cost to generate electricity of <$0.04/kWh, and discounted payback period of around ~4 years. Simulation results can be used for designing an automatic preheating temperature control system to optimize exergy reco...
Iran, 2007
In early 2007, surface survey, geophysical analysis and excavations were carried out at the site ... more In early 2007, surface survey, geophysical analysis and excavations were carried out at the site ofQaleh Kali (Tappeh Servan!Jinjun), in the Mamasani District of Fars. The excavations revealed that multiple phases of occupation are preserved at the site, the earliest of which appears to have been a sizeable elite structure that may in fact have had a royal clientele, as suggested by the presence of monumental Persepolis-style column bases and the quality of the fragments of fine glass and polished stone vessels discovered in the excavations. Although it has not yet been identified with any certainty, it is likely that Qaleh Kali is mentioned in the Persepolis Fortification Texts.
International Journal of Refrigeration-revue Internationale Du Froid, 2017
Scientia Iranica, 2002
... Department of Chemical Engineering, Sharif University of D'ch.nology. ... as [3]: d2 ß g... more ... Department of Chemical Engineering, Sharif University of D'ch.nology. ... as [3]: d2 ß g *<^>" v. (6) The mass transfer coefficient, K at the solid bound-ary layer of a well-stirred solid-liquid system can be calculated from [3]: Ks = D 2 + 0.4(Ksg5p3)025( )°-333 ßs pD (7 ...
Applied Thermal Engineering, 2020
Journal of Natural Gas Science and Engineering, 2020
Journal of Petroleum Science and Technology, Mar 10, 2014
In the present paper, the biodesulfurization of simulated light fuel oil (i.e., dibenzothiophene ... more In the present paper, the biodesulfurization of simulated light fuel oil (i.e., dibenzothiophene (DBT) in dodecane) and untreated kerosene with a high total sulfur content has been studied by a native isolated bacterium named Bacillus cereus HN. The influences of various parameters such as the reaction temperature (T), biocatalyst cell density, oil phase fraction (OFP), and initial DBT concentration on the fractional conversion of the model sulfur compound were investigated. The experimental data obtained were used to determine the reaction rate constant of the model sulfur compound and the corresponding activation energy. Furthermore, the biodesulfurization of untreated kerosene with a total sulfur content of 2333 ppmw produced by an Iranian refinery company (Isfahan refinery) was investigated to examine the capability of this new microorganism. It was realized that about 33% of the total sulfur content of untreated kerosene could be removed after 72 hrs. The results of the response surface methodology (RSM) showed that a quadratic correlation could be proposed for the influences of biocatalyst cell density, OFP, and initial DBT concentration on the desulfurization of DBT.
Separation and Purification Technology, Dec 1, 2021
Abstract To reduce the sulfur content of crude diesel, several sets of experiments have been cond... more Abstract To reduce the sulfur content of crude diesel, several sets of experiments have been conducted using electrochemical oxidative desulfurization technique using electrolyte of NaOH at different applied voltages. Due to impacts of operating parameters on desulfurization, kinetic study is pursued and it is found that the kinetic follows a second order reaction rate with a high accuracy. The reaction of desulfurization was modeled using COMSOL and followed by coupled electrochemical oxidation-extraction, while the extraction process was particularly performed using process simulator. The effects of different solvents on extraction performance were studied and dimethyl sulfoxide was selected for further investigation. Sensitivity of operating and design parameters of solvent flow rate, operating pressure and the number of extraction stage were analyzed by adding new terms into consideration. The new terms of extraction efficiency, oil and solvent recoveries were calculated for each case. The sensitivity analysis showed that low solvent flow leads to high extraction efficiency, while low solvent recovery is obtained. Increasing the number of extraction stages resulted in a higher extraction efficiency and solvent recovery. To find the optimal condition, a multi-objective optimization for extraction process is applied by maximizing extraction efficiency, oil and solvent recoveries at different operating and design conditions. The optimal values were operating pressure of 4 bar, solvent flow rate of 80 kmol/h and ten extraction stages.
International Journal of Hydrogen Energy, Sep 1, 2020
Abstract In this research, a series of NiO-xMgO-SiO2 catalysts with various MgO/SiO2 molar ratios... more Abstract In this research, a series of NiO-xMgO-SiO2 catalysts with various MgO/SiO2 molar ratios were prepared via precipitation method followed by a hydrothermal treatment in the presence of PVP as surfactant. The synergic effect between MgO and SiO2 leading to the various characteristic and catalytic performance during propane steam reforming was investigated in detail. The results showed that 15 wt% NiO-0.5MgO–SiO2 catalyst possessed the highest catalytic activity (68.9% conversion for C3H8 at 550 °C) with a negligible amount of carbon formation after 20 h of reaction duration. This superior catalytic performance can be attributed to the enhanced basicity strength along with strong metal-support interaction due to the formation of NiO–MgO solid solution, as confirmed by CO2-TPD and TPR analyses, respectively. In addition, the maximum hydrogen yield was obtained through the NiO–MgO sample because of higher progress in other hydrogen production routes as opposed to that of the propane steam reforming. It also can be suggested that relatively weak interaction between active sites and support was probably the main reason for unstable catalytic behavior of NiO–SiO2 sample with the lowest activity. This study confirms that the appropriate MgO/SiO2 ratio led to the sufficient metal-support interaction and delicate balance between acidic/basic sites, which was followed by the great activity, and coke resistance during PSR.
Journal of Crystal Growth, Feb 1, 2002
Precipitation is an important stage of the Bayer process. For simulation of this section, growth-... more Precipitation is an important stage of the Bayer process. For simulation of this section, growth-rate estimation of Al(OH) 3 crystals, is vital for the solution of population balance. Various published equations for linear growth rate of Al(OH) 3 are reviewed. In all of these equations, a square exponent was considered for supersaturation terms. In some of the previous works, it was believed that BCF model is the governing mechanism for surface growth of crystals. It is shown that polynuclear model is the most probable mechanism. Also, a modification of the best previous correlation is performed, which results in a considerable improvement of the growth-rate estimation over the available published experimental data.
Separation and Purification Technology, Oct 1, 2020
Abstract Presence of sulfur components in liquid fuels should be controlled due to environmental ... more Abstract Presence of sulfur components in liquid fuels should be controlled due to environmental issues and process considerations. In order to decrease the level of sulfurous compounds in crude gas-oil with 5750 ppmw sulfur, electrochemical oxidative desulfurization has been investigated over electrodes of copper and stainless steel because of their easy operation and mild process conditions. In this research, the effects of stirring rate, temperature, applied potential, sodium hydroxide addition as electrolyte media and water volume have been examined on the sulfur removal efficiency. The results show that electrical conductivity of gas-oil sharply increases with addition of electrolyte up to 613 µs/cm. The results also indicate that the increase in applied potential, temperature, water volume, sodium hydroxide content leads to enhancement of desulfurization efficiency. The response surface methodology has been applied to carry out single and multi-objective optimizations.
Mathematical biosciences, Feb 1, 2019
This is a PDF file of an unedited manuscript that has been accepted for publication. As a service... more This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Highlights The location of the tubules affects the solutes concentration The boot-shaped prebend segment significantly increased osmolality of collecting duct. Collecting duct osmolality at the end of the IM is 1198 mOsmol/kg H2O which was close to experimental data. Osmolality of tubules at cortico-medullary boundary were lower than blood plasma (~290 mOsmol/kg H2O) and close to experimental data.
Desalination, Mar 1, 2021
Impacts of energy recovery devices, batteries and permeability have been evaluated • The scenario... more Impacts of energy recovery devices, batteries and permeability have been evaluated • The scenario where all the PV power is exported to the grid has the highest NPV • Using energy recovery devices is not economically viable in each scenario • For discount rates higher than 23%, there is no room for PV-RO desalination plants • The worst scenario is the one that uses batteries
Computers & Chemical Engineering, 2023
Iranian Journal of Chemistry & Chemical Engineering-international English Edition, Jun 1, 1989
Two phase gas-liquid flow pattern in a horizontal pipeline is predicted very accurately using a n... more Two phase gas-liquid flow pattern in a horizontal pipeline is predicted very accurately using a newly-developed analytical relation. The pattern identification is based on one of the most widely used graphs, the Baker diagram, modified in a way that compensates for the unrealistic oversimplifications of recent works. The Kern's method of pressure drop calculation is used to obtain the frictional pressure drop in a gas-liquid pipeline flow. An interactive computer program is developed for the prediction of the flow pattern and calculation of pressure drop.
International Journal of Environmental Science and Technology, Jan 26, 2021
To propose a conceptual arrangement of reverse osmosis desalination plants, four comprehensive de... more To propose a conceptual arrangement of reverse osmosis desalination plants, four comprehensive decision algorithms and a software are developed. Typically, commercial software predict the performance of the reverse osmosis membranes based on their pre-determined configuration; however, the developed decision algorithms and the developed software in this study have the capability of introducing the conceptual arrangement of pretreatment units, reverse osmosis membranes, and energy recovery devices for both seawater and brackish water reverse osmosis plants. To perform a comprehensive study, alongside the developed software and the decision algorithms, both design considerations of the required equipment in pretreatment units and mathematical modeling of reverse osmosis membranes are included. Finally, to validate the accuracy of the developed decision algorithms and the software, four installed reverse osmosis desalination plants for producing drinking water from seawater and brackish water feeds are investigated. The algorithmic proposed plants for all four cases were in close agreement with the implemented industrial cases and World Health Organization standards.
Journal of Chemical and Petroleum Engineering, 2017
Separation of a racemic mixture of ibuprofen at a low concentration level by supercritical fluid ... more Separation of a racemic mixture of ibuprofen at a low concentration level by supercritical fluid chromatography in a simulated moving bed (SFC-SMB) is investigated by simulation. The feasibility of ibuprofen enantiomers separation has been experimentally examined in the literature. Our simulation results show that separation of ibuprofen enantiomers is feasible by this method, and R-ibuprofen and S-ibuprofen products with purity of over 99% can be obtained, which agrees with experimental data in the literature. For initial studies, the triangular theory is used to find the operating conditions. This simulation shows that the application of the triangular diagram is valuable in cases where none of the operating conditions is available. The operating point conditions, such as streams flow rates and switching time, are obtained with this method. Also, the effect of the location of the selected operating points in the triangular diagram on operating conditions, purity, and concentration...
This paper investigates the economic feasibility of installing a turboexpander in parallel with t... more This paper investigates the economic feasibility of installing a turboexpander in parallel with the throttling valve of a city gate station for the purpose of distributed electricity generation through exergy recovery from pressurized natural gas. The preheating requirements for preventing hydrate formation due to pressure reduction are provided by the combustion of a small fraction of the outlet natural gas stream. As a case study, the simulation of Tehran No.2 City Gate Station demonstrates an exergy loss of more than 36.5 million kWh per year for the present throttling valves. Thermoeconomic analyses gives the optimum operating conditions for electricity generation through a turboexpander. Optimization of preheating temperature leads to an exergy recovery of >60%, cost to generate electricity of <$0.04/kWh, and discounted payback period of around ~4 years. Simulation results can be used for designing an automatic preheating temperature control system to optimize exergy reco...