Loading...
Search for: extraction
0.011 seconds
Total 876 records

    Synergistic effect of MEHPA on co-extraction of zinc and cadmium with DEHPA

    , Article Minerals Engineering ; Volume 17, Issue 1 , 2004 , Pages 89-92 ; 08926875 (ISSN) Keshavarz Alamdari, E ; Moradkhani, D ; Darvishi, D ; Askari, M ; Behnian, D ; Sharif University of Technology
    2004
    Abstract
    Simultaneous extraction of zinc and cadmium by a mixture of di-2-ethyl hexyl phosphoric acid (DEHPA) and mono-2-ethyl hexyl phosphoric acid (MEHPA), and the synergistic effect of MEHPA on co-extraction of zinc and cadmium with DEHPA have been investigated. It was shown that the extraction of zinc and cadmium by DEHPA and/or MEHPA can be increased by an increase of pH. The results also illustrate that the pH0.5 of zinc, by increase in MEHPA from 0.1 to 8 vol%, did not vary significantly while that of cadmium varies from 0.63 to 2.4. In other words MEHPA prevents selective extraction of zinc from aqueous media containing both zinc and cadmium. Studies on the selective separation parameter... 

    Direct extraction of Mo(VI) from sulfate solution by synergistic extractants in the rotation column

    , Article Chinese Journal of Chemical Engineering ; Volume 28, Issue 2 , 2020 , Pages 445-455 Shakib, B ; Torab Mostaedi, M ; Outokesh, M ; Asadollahzadeh, M ; Sharif University of Technology
    Chemical Industry Press  2020
    Abstract
    Direct extraction of molybdenum from sulfate solution with synergistic extractants (mixture of D2EHPA and TBP) was studied in the rotation column. The influence of extractant concentration and initial pH of aqueous phase was studied in the bench scale experiments. The outcomes demonstrated that the synergistic solvent extraction enhances the constancy of the extracted complexes for transfer into the organic phase. In the continuous experiments, the effect of different operating parameters such as speed of agitation, inlet solvent flow rate and inlet aqueous flow rate on the holdup, mean drop size, drop size distribution, slip and characteristic velocities and extraction percentage were... 

    Thermodynamics of extraction of Zn2+ from sulfuric acid media with a mixture of DEHPA and MEHPA

    , Article International Journal of Engineering, Transactions B: Applications ; Volume 17, Issue 2 , 2004 , Pages 191-200 ; 1728-144X (ISSN) Sadrnezhaad, S. K ; Keshavarz Alamdari, E ; Sharif University of Technology
    Materials and Energy Research Center  2004
    Abstract
    Thermodynamics of extraction of Zn2+ from sulfuric acid media contacting to a mixture of DEHPA and MEHPA diluted with 80 wt% aromatic - aliphatic kerosene with a constant DEHPA to MEHPA ratio is investigated at different acidities, concentrations and temperatures. As a result, the extraction reaction is found to be endothermic with a zinc distribution factor that increases with increasing of the temperature, acidity of the solution and the concentration of the extradant. The mechanism of the extraction reaction is shown to be different for pH > 1 with that at pH <1. The pH of the aqueous media has also an important influence on progressing of the extraction reaction  

    Commonsense knowledge extraction for persian language: a combinatory approach

    , Article Iranian Journal of Information Processing Management ; Volume 31, Issue 1 , 2015 , Pages 109-124 ; 22518223 (ISSN) Moradi, M ; Vazirnezhad, B ; Bahrani, M ; Sharif University of Technology
    Iranian Research Institute for Scientific Information and Documentation  2015
    Abstract
    The Putting human commonsense knowledge into computers has always been a long standing dream of artificial intelligence (AI). The cost of several tens of millions of dollars and time have been covered so that the computers could know about "objects falling, not rising.", "running is faster than walking". The large database was built, automated and semi-automated methods were introduced and volunteers' efforts were utilized to achieve this, but an automated, high-throughput and low-noise method for commonsense collection still remains as the holy grail of AI. The aim of this study was to build commonsense knowledge ontology using three approaches namely Hearst method, machine translation and... 

    Extraction of molybdenum (VI) and vanadium (V) from nitrate solutions using coupling of acid and solvating extractants

    , Article International Journal of Engineering, Transactions A: Basics ; Volume 32, Issue 10 , 2019 , Pages 1366-1371 ; 17281431 (ISSN) Shakib, B ; Torab Mostaedi, M ; Outokesh, M ; Asadollahzadeh, M ; Sharif University of Technology
    Materials and Energy Research Center  2019
    Abstract
    In this study, solvent extraction method has been utilized for separation of molybdenum and vanadium from nitrate solution by utilizing coupling of acid and solvating extractants (D2EHPA and TBP extractants). The outcomes demonstrated that synergistic solvent extraction improves stability of formatted complexes for transfer to the organic phase. The main parameters such as pH value, concentration of extractants, NH4OH concentration as the stripping agent and contact time were optimized at 0.4, 15% (v/v) D2EHPA, 10% (v/v) TBP, 2 M and 30 min, respectively. The maximum separation factor of 24.84 was obtained with a new synergistic mixture of D2EHPA and TBP diluted with kerosene. According to... 

    A new ROI extraction method for FKP images using global intensity

    , Article 2012 6th International Symposium on Telecommunications, IST 2012 ; 2012 , Pages 1147-1150 ; 9781467320733 (ISBN) Ehteshami, N. S. M ; Tabandeh, M ; Fatemizadeh, E ; Sharif University of Technology
    2012
    Abstract
    Finger-Knuckle-Print (FKP) is one of the newest biometrics. In this paper, a novel approach has been proposed to segment the Region of Interest (ROI) of a FKP image using the global intensity. This method upgrades the speed and accuracy of segmentation stage, as well as the pace of other steps of the procedure. This has been achieved by employing the area with maximum intensity in ROI extraction, instead of using the creases of the knuckle image. To confirm this improvement, lots of experiments have been performed and the method has been compared with the only existing schemes for ROI extraction suggested by Zhang and Kekre. At the end, the captured ROI images obtained by three methods have... 

    Modelling of mean drop size in a extraction spray column and developing a new model

    , Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 30, Issue 4 , 2011 , Pages 89-96 ; 10219986 (ISSN) Ghorbanian, S. A ; Abolghasemi, H ; Radpour, S. R ; Sharif University of Technology
    2011
    Abstract
    Drop size distribution plays a key role in the liquid extraction systems and related hydrodynamic and mass transfer parameters. In current research work, the size of drops in an extraction spray column has been measured by direct photography method, and the Sauter mean diameter has been obtained accordingly. Then, two types of models are assessed based on using dimensionless analysis and appropriate software. The interfacial tension in used chemical system is 1.8-32 dyne/cm. In first type of models, the correlation is established based on dimensionless parameters similar to approaches defined by other researchers. In second types, dimensional parameters have been used and therefore a new... 

    Unsupervised approach to extract summary keywords in meeting domain

    , Article 2015 23rd European Signal Processing Conference, EUSIPCO 2015, 31 August 2015 through 4 September 2015 ; August , 2015 , Pages 1406-1410 ; 9780992862633 (ISBN) Bokaetf, M. H ; Sameti, H ; Liu, Y ; Sharif University of Technology
    Institute of Electrical and Electronics Engineers Inc  2015
    Abstract
    Summary keywords are words that are used in the reference extracted summary, therefore can be used to discriminate between summary sentences from non-summary ones. Finding these words is important for the extractive summarization algorithms that measure the importance of a sentence based on the importance of its constituent words. This paper is focused on extracting summary keywords in the multi-party meeting domain. We test previously proposed keyword extraction algorithms and evaluate their performance to determine summary keywords. We also propose a new approach which uses discourse information to find local important keywords and show that it outperforms all the previous methods. We... 

    Deterministic randomness extraction from generalized and distributed Santha-Vazirani sources

    , Article SIAM Journal on Computing ; Volume 46, Issue 1 , 2017 , Pages 1-36 ; 00975397 (ISSN) Beigi, S ; Etesami, O ; Gohari, A ; Sharif University of Technology
    Society for Industrial and Applied Mathematics Publications  2017
    Abstract
    A Santha-Vazirani (SV) source is a sequence of random bits where the conditional distribution of each bit, given the previous bits, can be partially controlled by an adversary. Santha and Vazirani show that deterministic randomness extraction from these sources is impossible. In this paper, we study the generalization of SV sources for nonbinary sequences. We show that unlike the binary setup of Santha and Vazirani, deterministic randomness extraction in the generalized case is sometimes possible. In particular, if the adversary has access to s "nondegenerate" dice that are c-sided and can choose one die to throw based on the previous realizations of the dice, then deterministic randomness... 

    Stagewise modeling of liquid-liquid extraction column (RDC)

    , Article International Journal of Engineering, Transactions B: Applications ; Volume 17, Issue 1 , 2004 , Pages 7-17 ; 1728-144X (ISSN) Bastani, D ; Sharif University of Technology
    National Research Center of Medical Sciences  2004
    Abstract
    Stagewise forward mixing model considering coalescence and redispersion of drops was used to predict the performance of Rotating Disc Liquid-Liquid Extraction Contactors. Experimental data previously obtained in two RDC columns of 7.62 cm diameter, 73.6cm height and 21.9cm diameter, 150cm height were used to evaluate the model predictions. Drop-side mass transfer coefficients were predicted applying Handlos-Baron drop model and Olney's model was used to predict drop velocities. According to the results obtained the followings could be concluded: (1) If the height of coalescence and redispersion i.e.: h = h pφp /φ could be estimated, the stagewise forward mixing with coalescence and... 

    Extraction conditions for removal of oxidized sulfur compounds in gas oil

    , Article Korean Journal of Chemical Engineering ; Volume 30, Issue 3 , 2013 , Pages 700-705 ; 02561115 (ISSN) Heidari, M ; Safekordi, A. A ; Ghaedian, M ; Shafeghat, A ; Sharif University of Technology
    2013
    Abstract
    An experimental study was conducted to investigate the extraction of oxidized sulfur compounds from gas oil. Solvents used for this purpose included acetone, acetonitrile, methanol and propanol. The effect of solvent concentration, solvent to gas oil ratio, temperature, time and number of stages was studied. To select the best solvent and conditions for extraction, two criteria were considered: high desulfurization and more hydrocarbon recovery. Results showed that extraction time and temperature have no significant effect. Methanol for low ability of extraction of oxidized sulfur compounds and propanol for low hydrocarbon recovery were excluded from further experiments. After the tests, the... 

    Investigation of the impact of synthesized hydrophobic magnetite nanoparticles on mass transfer and hydrodynamics of stagnant and stirred liquid–liquid extraction systems

    , Article Chemical Engineering Research and Design ; Volume 147 , 2019 , Pages 305-318 ; 02638762 (ISSN) Hatami, A ; Azizi, Z ; Bastani, D ; Sharif University of Technology
    Institution of Chemical Engineers  2019
    Abstract
    The impact of modified magnetite nanoparticles (MMNPs)on hydrodynamics and mass transfer in liquid–liquid extraction process was assessed using a ternary chemical system of toluene-acetic acid–water. The organic phase which contained toluene and acetic acid was dispersed through water, and the mass transfer of acetic acid between two phases was investigated. The hydrophobic modified magnetite nanoparticles (MMNPs)prepared through an optimized in-situ method were added to the dispersed phase at different concentrations (0.001−0.005 wt%). Two separate conditions were provided in the experiments, i.e. stagnant and stirred continuous phase. The latter case was provided by a rotor at two... 

    Kinetic modeling and simulation study for a sequential electrochemical extractive crude diesel desulfurization

    , Article Separation and Purification Technology ; Volume 278 , 2022 ; 13835866 (ISSN) Tavan, Y ; Farhadi, F ; Shahrokhi, M ; Sharif University of Technology
    Elsevier B.V  2022
    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... 

    A conically fixed position single drop microextraction method for isolation of aryloxyphenoxypropionate herbicides from aquatic media

    , Article Analytical Methods ; Volume 5, Issue 18 , Jul , 2013 , Pages 4846-4851 ; 17599660 (ISSN) Bagheri, H ; Dehghan, M ; Es'Haghi, A ; Naderi, M ; Sharif University of Technology
    2013
    Abstract
    A new and convenient format of single drop microextraction (SDME) was developed and applied for isolation of some selected aryloxyphenoxypropionate herbicides from aquatic media. In contrast to the conventional SDME procedure, in this set-up the extraction microdrop was positioned at the bottom of a conical vial in order to provide much higher stability for the organic extraction phase while a magnetic bar was used for stirring the aqueous solution. A simple magnet was used for positioning the bar on the top of the microdrop prior to stirring. The whole set-up led to the use of any volume of extraction solvent with unlimited stirring rates. Some important extraction parameters such as the... 

    Separation of Re and Mo from roasting-dust leach-liquor using solvent extraction technique by TBP

    , Article Separation and Purification Technology ; Volume 86 , February , 2012 , Pages 143-148 ; 13835866 (ISSN) Keshavarz Alamdari, E ; Darvishi, D ; Haghshenas, D. F ; Yousefi, N ; Sadrnezhaad, S. K ; Sharif University of Technology
    Abstract
    Re/Mo separation is studied by a new solvent extraction technique which is based on extraction mechanisms of the constituent metals. Based on McCabe-Thiele plots, a flow diagram has been proposed for separation and purification of Re over Mo. Re-recovery section of the diagram shows that Re is extracted when major amount of Mo is removed. For removal of the remained Mo, a two-stage extraction is required at pH = 2 and V a/V o = 1. In order to obtain Re, the resulted aqueous phase is stripped by adding sulfuric acid. According to the results, while more Re is extracted at less pH, optimum extraction of Mo happens at pH = 1.2. Re selectivity over Mo maximizes by approaching of the pH to zero  

    Thermodynamics of vanadium (V) solvent extraction by mixture of D2EHPA and TBP

    , Article International Journal of Mineral Processing ; Volume 138 , May , 2015 , Pages 49-54 ; 03017516 (ISSN) Cheraghi, A ; Ardakani, M. S ; Keshavarz Alamdari, E ; Haghshenas Fatmesari, D ; Darvishi, D ; Sadrnezhaad, S. K ; Sharif University of Technology
    Elsevier  2015
    Abstract
    In the present study, the thermodynamics and mechanisms of vanadium extraction by a mixture of bis-2-ethylhexyl phosphoric acid (D2EHPA) and tri-n butyl phosphate (TBP) from sulfate medium were investigated. It was found that the maximum extraction percent of vanadium occurs at pH 1.8 under ambient conditions; this phenomenon was ascribed to the predominant presence of cationic species of vanadium (VO2+) at this pH. Based on the Fourier Transform Infrared (FT-IR) spectrums, the POH bond of D2EHPA was found responsible for the extraction of VO2+ species through a cationic exchange mechanism. Employing the slope analysis method showed that the stoichiometric reaction... 

    Liquid-liquid extraction of oxidized sulfur-containing compounds of non-hydrotreated kerosene

    , Article Fuel Processing Technology ; Volume 91, Issue 11 , November , 2010 , Pages 1386-1394 ; 03783820 (ISSN) Sobati, M. A ; Molaei Dehkordi, A ; Shahrokhi, M ; Sharif University of Technology
    2010
    Abstract
    An experimental study was conducted on the desulfurization of non-hydrotreated kerosene with oxidation followed by liquid-liquid extraction. Various types of solvents including acetonitrile, methanol, and ethanol have been examined in the extraction of oxidized sulfur-containing compounds of kerosene. The performance of these solvents has been carefully examined and compared. It was found that their performance follows the order: acetonitrile > methanol > ethanol. The effects of number of extraction stages and solvent to kerosene ratio on the desulfurization and recovery of kerosene have been investigated. The experimental results show that for all three solvents, solvent/kerosene ratio and... 

    Experimental investigation of the effects of surfactants on the mass transfer in liquid-liquid extraction equipment

    , Article 2007 5th Joint ASME/JSME Fluids Engineering Summer Conference, FEDSM 2007, San Diego, CA, 30 July 2007 through 2 August 2007 ; Volume 2 FORA, Issue PART A , 2007 , Pages 239-244 ; 0791842886 (ISBN); 9780791842881 (ISBN) Haghdoost, A ; Shah Alami, M ; Mansouri, H ; Sharif University of Technology
    2007
    Abstract
    Mass transfer rates to the drops in liquid-liquid extraction equipment are often likely to be reduced by the presence of surface active contaminants. This reduction in mass transfer is said to be due to a reduction in terminal velocity, and to changes in pattern of internal circulation. A single-drop extraction apparatus was used to investigate the dependency of mass transfer coefficient on the amount of surfactant added in a system of n-butanol/succinic acid/water. Three types of surfactants, SDS, DTMAC and Triton X-100, were used to study their effects on the inhibition of mass transfer in liquid-liquid extraction. The effect of surfactants concentration on extraction percentage, overall... 

    A new image texture extraction algorithm based on Matching Pursuit Gabor wavelets

    , Article 2005 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP '05, Philadelphia, PA, 18 March 2005 through 23 March 2005 ; Volume II , 2005 , Pages II740-II744 ; 15206149 (ISSN); 0780388747 (ISBN); 9780780388741 (ISBN) Yaghoobi, M ; Rabiee, H. R ; Ghanbari, M ; Shamsollahi, M. B ; Sharif University of Technology
    2005
    Abstract
    Feature vector extraction, based on local image texture, is a primitive algorithm for many other applications, like segmentation, clustering and identification. If these feature vectors are a good match to the human visual system (HVS), we can expect to get the appropriate results by using them. Gabor filters has been used for this purpose successfully. In this paper we introduce a novel refinement, with the use of Matching Pursuit (MP) to improve the Gabor based texture feature extractor. With this improvement, we show that the separability of different textures will increase. Another consideration in this work is computation complexity. Therefore, we limit the basis function set to reduce... 

    Uranium Recovery from Sludge of Evaporation Lagoons of Isfahan’s UCF Plant

    , M.Sc. Thesis Sharif University of Technology Hanif Pour, Fateme (Author) ; Samadfam, Mohammad (Supervisor) ; Ghaemi, Ahad (Supervisor) ; Ghasemi, Mohammad Reza (Co-Advisor)
    Abstract
    Nuclear energy is one of the most important sources of energy from the economical point of view and also in terms of cleanliness and safety. Hence, strategically, uranium is one of the most basic elements of the earth and nowadays, the importance of this element is more marked due to the nuclear industry developement. Therefore, uranium recovery from the wastes generated during nuclear fuel production in Isfahan’s uranium conversion plant- in which yellow cake is converted to uranium hexafluoride- is quite pivotal. In this experimental research, uranium is extracted from the sludge of evaporation lagoons of Isfahan’s UCF plant via solvent extraction method. Execution of this project in an...