Search results for: Mehdi Asadollahzadeh

Items from 1 to 20 out of 30 results

article

Optimizing the extraction of cobalt ions under response surface methodology and without organic solutions

Razieh Sobhi Amjad, Mehdi Asadollahzadeh, Rezvan Torkaman, Meisam Torab‐Mostaedi

The Canadian Journal of Chemical Engineering > 101 > 6 > 3532 - 3540

In this study, response surface methodology was used to evaluate the extraction of cobalt ions using an aqueous two‐phase system (ATPS). This method is environmentally benign and low‐risk because water has replaced the poisonous and dangerous organic solvents in this extraction procedure. For the first time, a central composite design was employed to examine the effect of various factors on the extraction...

article

An overview of sustainable energy development by using cogeneration technology and opportunity for improving process

Ali Akbar Salehi, Mohammad Ghannadi‐Maragheh, Meisam Torab‐Mostaedi, Rezvan Torkaman, more

International Journal of Energy Research > 45 > 8 > 11423 - 11439

Nowadays, energy supply is one of the most prominent demands of countries in the world. The enhancement in energy efficiency, flexibility for applications in various industrial processes, and the reduction in the environmental impacts of pollutant emissions can be accomplished by using sustainable energy sources. Alternative procedures for heat and electricity production have been developed in the...

article

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Mehdi Asadollahzadeh, Nahid Raoufi, Mashallah Rezakazemi, Saeed Shirazian

Macromolecular Theory and Simulations > 27 > 3 > n/a - n/a

A mechanistic model is developed to simulate ethanol purification using membrane technology. In the considered process, a feed solution containing 10 wt% water + 90 wt% ethanol is contacted with a polymeric dense membrane in a pervaporation system. The membrane selectively separates water from solution in order to purify the ethanol. In the development of the model, it is assumed that the water is...

article

Investigation into Ethanol Purification Using Polymeric Membranes and a Pervaporation Process

Nahid Raoufi, Mehdi Asadollahzadeh, Saeed Shirazian

Chemical Engineering & Technology > 41 > 2 > 278 - 284

A comprehensive computational fluid dynamics simulation was developed for the rational design of a bioethanol purification system using a pervaporation process by tailoring the hydrodynamics of the process. The process involves the removal of water from a water/ethanol liquid mixture using a dense polymeric membrane. The model domain was divided into two compartments comprising the feed and the membrane...

article

New correlations for slip velocity and characteristic velocity in a rotary liquid–liquid extraction column

Mehdi Asadollahzadeh, Rezvan Torkaman, Meisam Torab-Mostaedi

Chemical Engineering Research and Design > 2017 > 127 > C > 146-153

In this research work, the hydrodynamic behavior of a Kühni extraction column has been investigated for determination of slip velocity and characteristic velocity for three different liquid–liquid systems with and without mass transfer conditions and toluene–water system with the presence of silica nanoparticles. The effects of the agitation speed, dispersed as well as continuous phase velocity, and...

article

Recovery of cobalt from spent lithium ion batteries by using acidic and basic extractants in solvent extraction process

Rezvan Torkaman, Mehdi Asadollahzadeh, Meisam Torab-Mostaedi, Mohammad Ghanadi Maragheh

Separation and Purification Technology > 2017 > 186 > C > 318-325

Solvent extraction studies of cobalt from aqueous chloride solution have been focused on using three acidic (Cyanex301, D2EHPA, Cyanex272) and two basic (Alamine336, TOA) extractants. The effects of operating variables, such as time, chloride or sulfate ions, aqueous phase acidity, concentration of the extractant, temperature and various acid solutions in the metal stripping from the loaded organic...

article

Reactive extraction of cobalt sulfate solution with D2EHPA/TBP extractants in the pilot plant Oldshue–Rushton column

Rezvan Torkaman, Mehdi Asadollahzadeh, Meisam Torab-Mostaedi, Mohammad Ghanadi Maragheh

Chemical Engineering Research and Design > 2017 > 120 > C > 58-68

In this study, a pilot plant Oldshue–Rushton extraction column has been proposed to extract and recover cobalt from sulfuric acid leach solution. The effect of D2EHPA and TBP concentration, initial aqueous pH and stripping solvent on the Co(II) extraction was investigated in the batch experiment. The results from batch experiments showed that the D2EHPA/TBP mixed extractant is a suitable choice for...

article

Prediction of mass transfer coefficients in an asymmetric rotating disk contactor using effective diffusivity

Meisam Torab-Mostaedi, Mehdi Asadollahzadeh, Jaber Safdari

Chinese Journal of Chemical Engineering > 2017 > 25 > 3 > 288-293

Mass transfer characteristics have been investigated in a 113mm diameter asymmetric rotating disk contactor of the pilot plant scale for two different liquid–liquid systems. The effects of operating parameters including rotor speed and continuous and dispersed phase velocities on the volumetric overall mass transfer coefficients are investigated. The results show that the mass transfer performance...

article

Use of axial dispersion model for determination of Sherwood number and mass transfer coefficients in a perforated rotating disc contactor

Mehdi Asadollahzadeh, Alireza Hemmati, Meisam Torab-Mostaedi, Mansour Shirvani, more

Chinese Journal of Chemical Engineering > 2017 > 25 > 1 > 53-61

The mass transfer process in a perforated rotating disk contactor (PRDC) using a toluene–acetone–water system was investigated. The volumetric overall mass transfer coefficients are calculated in a PRDC column. Both mass transfer directions are considered in experiments. The influences of operating variables containing agitation rate, dispersed and continuous phase flow rates and mass transfer in...

article

Determination of slip and characteristic velocities in reactive extraction with experiments in the Oldshue-Rushton column and presence of samarium and gadolinium metals

Rezvan Torkaman, Mehdi Asadollahzadeh, Meisam Torab-Mostaedi

Chemical Engineering and Processing: Process Intensification > 2017 > 111 > C > 7-13

The slip and characteristic velocities of the reactive system (samarium, gadolinium and D2EHPA) were investigated in the pilot plant Oldshue-Rushton extraction column. The experiments were carried out at the extraction and stripping stage. The influences of the agitation speed, dispersed as well as continuous phase velocity were studied. An increase in dispersed phase velocity led to the increase...

article

A comparison between drop size distributions derived from the probability distribution functions and maximum entropy principle. Case study; pilot plant Scheibel extraction column

Mehdi Asadollahzadeh, Rezvan Torkaman, Meisam Torab-Mostaedi, Jaber Safdari

Chemical Engineering Research and Design > 2017 > 117 > C > 648-658

A new model for prediction of drop size distribution is proposed in an eleven stage Scheibel extraction column by the maximum entropy density approximation technique. In addition, the conventional probability distribution functions (Gamma, Inverse Gaussian, Weibull) have already been applied to estimate the drop size distribution. The experimental procedures were carried out by three different systems...

article

Using maximum entropy, Gamma, Inverse Gaussian and Weibull approach for prediction of drop size distribution in a liquid–liquid extraction column

Mehdi Asadollahzadeh, Rezvan Torkaman, Meisam Torab-Mostaedi, Jaber Safdari

Chemical Engineering Research and Design > 2017 > 117 > C > 637-647

In this study, drop size distribution and Sauter mean drop diameters were measured and correlated under operating variables and physical properties of the systems using a 113mm diameter Kühni column. Three systems including toluene-water, n-butyl acetate-water and n-butanol-water were experimented in this column. The countercurrent flow pattern of the liquid phases was characterized regarding the...

article

Polymer-water partition coefficients in polymeric passive samplers

Milad Asgarpour Khansary, Saeed Shirazian, Mehdi Asadollahzadeh

Environmental Science and Pollution Research > 2017 > 24 > 3 > 2627-2631

Passive samplers are of the most applied methods and tools for measuring concentration of hydrophobic organic compounds in water (c₁^W) in which the polymer-water partition coefficients (D) are of fundamental importance for reliability of measurements. Due to the cost and time associated with the experimental researches, development of a predictive method for estimation and evaluation of performance...

article

Holdup and flooding measurements in an asymmetric rotating disc column

Mehdi Asadollahzadeh, Meisam Torab-Mostaedi, Rezvan Torkaman

Chemical Engineering and Processing: Process Intensification > 2016 > 109 > C > 97-103

Dispersed phase holdup and flooding rates have been measured in a 113mm diameter asymmetric rotating disc contactor (ARDC) of pilot plant scale for three different liquid–liquid systems. The effects of operating variables including mass transfer conditions, rotor speed and continuous and dispersed phase velocities on hydrodynamic parameters are investigated. The results showed that the maximum capacity...

article

Topology optimization of neural networks based on a coupled genetic algorithm and particle swarm optimization techniques (c-GA–PSO-NN)

Azam Marjani, Saeed Shirazian, Mehdi Asadollahzadeh

Neural Computing and Applications > 2018 > 29 > 11 > 1073-1076

In this short paper, a coupled genetic algorithm and particle swarm optimization technique was used to supervise neural networks where the applied operators and connections of layers were tracked by genetic algorithm and numeric values of biases and weights of layers were examined by particle swarm optimization to modify the optimal network topology. The method was applied for a previously studied...

article

Experimental mass transfer coefficients in a pilot plant multistage column extractor

Mehdi Asadollahzadeh, Ahad Ghaemi, Meisam Torab-Mostaedi, Shahrokh Shahhosseini

Chinese Journal of Chemical Engineering > 2016 > 24 > 8 > 989-999

The volumetric overall mass transfer coefficients in a multistage column have been measured using axial dispersion model for toluene–acetone–water system. The effect of operating parameters on the volumetric overall mass transfer coefficients has been investigated for both mass transfer directions. The results show that the mass transfer performance is strongly dependent on rotor speed and mass transfer...

article

Drop behavior in a pilot plant Oldshue–Rushton extraction column for three various liquid–liquid systems

Mehdi Asadollahzadeh, Shahrokh Shahhosseini, Meisam Torab-Mostaedi, Ahad Ghaemi

Separation and Purification Technology > 2016 > 159 > C > 7-17

Drop size distribution and Sauter mean drop diameters have been evaluated in an Oldshue–Rushton pilot plant extractor for three various liquid–liquid systems as a function of phase flow rates and intensity of agitation. The Sauter mean drop diameter and drop size distribution were found to depend largely on the speed of agitation, physical properties of liquid systems and direction of mass transfer,...

article

Holdup, characteristic velocity and slip velocity between two phases in a multi-impeller column for high/medium/low interfacial tension systems

Mehdi Asadollahzadeh, Meisam Torab-Mostaedi, Shahrokh Shahhosseini, Ahad Ghaemi

Chemical Engineering & Processing: Process Intensification > 2016 > 100 > Complete > 65-78

In this research work, liquid–liquid extraction via three different systems has been investigated for determination of holdup, slip velocity and characteristic velocity in a multi-impeller column. The effects of the agitation speed, dispersed as well as continuous phase velocity, direction of mass transfer, and interfacial tension were studied. The findings revealed that an increase in agitation speed...

article

Unified new correlation for prediction of dispersed phase holdup in agitated extraction columns

Mehdi Asadollahzadeh, Meisam Torab-Mostaedi, Shahrokh Shahhosseini, Ahad Ghaemi, more

Separation and Purification Technology > 2016 > 158 > C > 275-285

Dispersed phase holdup data have been obtained for Kühni and ORC columns with investigation on three different systems (toluene–water, n-butyl acetate–water, n-butanol–water). The effects of operational variables such as mass transfer directions with acetone transfer, rotor speed and dispersed and continuous phase velocities have been investigated. The dispersed phase holdup was influenced mainly...

article

Experimental investigation of dispersed phase holdup and flooding characteristics in a multistage column extractor

Mehdi Asadollahzadeh, Meisam Torab-Mostaedi, Shahrokh Shahhosseini, Ahad Ghaemi

Chemical Engineering Research and Design > 2016 > 105 > C > 177-187

In this research work, liquid–liquid extraction via three different systems has been investigated for determination of holdup, flooding velocities and holdup at the flooding points in a multistage column extractor. The effects of various parameters including rotor speed and dispersed and continuous phase velocities were studied. The results showed that the enhancement of rotor speed and dispersed...

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Keywords

DISPERSED PHASE HOLDUP (8)
MASS TRANSFER COEFFICIENT (6)
CHARACTERISTIC VELOCITY (3)
DROP SIZE DISTRIBUTION (3)
ENHANCEMENT FACTOR (3)
INTERFACIAL AREA (3)
LIQUID–LIQUID EXTRACTION (3)
MASS TRANSFER (3)
SAUTER MEAN DROP DIAMETER (3)
SLIP VELOCITY (3)
AXIAL DIFFUSION MODEL (2)
DISPERSIVE-SOLIDIFICATION LIQUID–LIQUID MICROEXTRACTION (2)
EFFECTIVE DIFFUSIVITY (2)
FLOOD POINT (2)
KÜHNI COLUMN EXTRACTOR (2)
MEAN DROP DIAMETER (2)
MEMBRANE (2)
MODELING (2)
PULSED DISC AND DOUGHNUT COLUMN (2)
SEPARATION (2)
SIMULATION (2)
ACIDIC ORGANOPHOSPHOROUS EXTRACTANTS (1)
ADSORPTION ISOTHERM (1)
AG(I) (1)
AMINE EXTRACTANTS (1)
AQUEOUS TWO‐PHASE SYSTEM (1)
ASYMMETRIC ROTATING DISC CONTACTOR (1)
ASYMMETRIC ROTATING DISC CONTACTOR (ARDC) (1)
ASYMMETRIC ROTATING DISK CONTACTOR (1)
AXIAL DISPERSION MODEL (1)
BIOSORPTION (1)
CENTRAL COMPOSITE DESIGN (1)
CERIUM (1)
CHEMOMETRIC TOOLS (1)
CO(II) (1)
COBALT (1)
COBALT EXTRACTION (1)
COGENERATION (1)
COMPOSITES (1)
COUPLING (1)
CU(II) (1)
DOLOMITE (1)
DROP SIZE (1)
ENVIRONMENTAL WATER SAMPLES (1)
EXPERIMENTAL DESIGN (1)
FLOODING VELOCITIES (1)
GENETIC ALGORITHM (1)
GRAPEFRUIT PEEL (1)
HANSEN SOLUBILITY (1)
HOLDUP (1)
HYDROGEN PRODUCTION (1)
INORGANIC ARSENIC (1)
ISOTHERM (1)
KINETIC (1)
KÜHNI COLUMN (1)
KÜHNI EXTRACTION COLUMN (1)
LANTHANUM (1)
LITHIUM ION BATTERIES (1)
MASS TRANSFER CONDITIONS (1)
MATHEMATICAL MODELING (1)
MAXIMUM ENTROPY PRINCIPLE (1)
MEMBRANES (1)
MULTI-IMPELLER COLUMN (1)
MULTISTAGE COLUMN (1)
MULTISTAGE COLUMN EXTRACTOR (1)
NEURAL NETWORKS (1)
NUCLEAR INDUSTRY (1)
OLDSHUE-RUSHTON EXTRACTION COLUMN (1)
OLDSHUE–RUSHTON EXTRACTOR (1)
OLDSHUE–RUSHTON PILOT PLANT COLUMN (1)
ORC COLUMN EXTRACTOR (1)
ORGANOPHOSPHORUS PESTICIDES (1)
PARTICLE SWARM OPTIMIZATION (1)
PARTITION COEFFICIENTS (1)
PASSIVE SAMPLERS (1)
PERFORATED ROTATING DISK CONTACTOR (1)
PERVAPORATION (1)
POLYETHYLENE GLYCOL (1)
POLYMER (1)
PROBABILITY DISTRIBUTION FUNCTIONS (1)
RARE METALS (1)
RESPONSE SURFACE METHODOLOGY (1)
SAUTER-MEAN DROP DIAMETER (1)
SCHEIBEL EXTRACTION COLUMN (1)
SHERWOOD NUMBER (1)
SOIL SAMPLES (1)
SOLID PHASE EXTRACTION (1)
SOLVENT EXTRACTION (1)
SUSTAINABLE ENERGY (1)
WATER (1)
WATER DESALINATION (1)
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Elsevier (20)
Wiley (6)
Springer (4)

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Search results for: Mehdi Asadollahzadeh

Optimizing the extraction of cobalt ions under response surface methodology and without organic solutions

An overview of sustainable energy development by using cogeneration technology and opportunity for improving process

Simulation of Nonporous Polymeric Membranes Using CFD for Bioethanol Purification

Investigation into Ethanol Purification Using Polymeric Membranes and a Pervaporation Process

New correlations for slip velocity and characteristic velocity in a rotary liquid–liquid extraction column

Recovery of cobalt from spent lithium ion batteries by using acidic and basic extractants in solvent extraction process

Reactive extraction of cobalt sulfate solution with D2EHPA/TBP extractants in the pilot plant Oldshue–Rushton column

Prediction of mass transfer coefficients in an asymmetric rotating disk contactor using effective diffusivity

Use of axial dispersion model for determination of Sherwood number and mass transfer coefficients in a perforated rotating disc contactor

Determination of slip and characteristic velocities in reactive extraction with experiments in the Oldshue-Rushton column and presence of samarium and gadolinium metals

A comparison between drop size distributions derived from the probability distribution functions and maximum entropy principle. Case study; pilot plant Scheibel extraction column

Using maximum entropy, Gamma, Inverse Gaussian and Weibull approach for prediction of drop size distribution in a liquid–liquid extraction column

Polymer-water partition coefficients in polymeric passive samplers

Holdup and flooding measurements in an asymmetric rotating disc column

Topology optimization of neural networks based on a coupled genetic algorithm and particle swarm optimization techniques (c-GA–PSO-NN)

Experimental mass transfer coefficients in a pilot plant multistage column extractor

Drop behavior in a pilot plant Oldshue–Rushton extraction column for three various liquid–liquid systems

Holdup, characteristic velocity and slip velocity between two phases in a multi-impeller column for high/medium/low interfacial tension systems

Unified new correlation for prediction of dispersed phase holdup in agitated extraction columns

Experimental investigation of dispersed phase holdup and flooding characteristics in a multistage column extractor

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