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    A novel correlation approach to estimate thermal conductivity of pure carbon dioxide in the supercritical region

    , Article Journal of Supercritical Fluids ; Volume 64 , 2012 , Pages 39-45 ; 08968446 (ISSN) Jarrahian, A ; Heidaryan, E ; Sharif University of Technology
    2012
    Abstract
    In this paper, a new correlation to calculate the thermal conductivity of supercritical carbon dioxide based on 668 data points from the literature is introduced. The proposed correlation is valid in temperature range from 310 to 960 K, and pressures range between 7.4 and 210 MPa. The average absolute error of the model was found to be 2.7 and 2.4% in the comparison with the literature and NIST data respectively, which demonstrates superiority of the model over other methods  

    Modelling of carbon dioxide corrosion of steel with iron carbonate precipitation

    , Article Corrosion Engineering Science and Technology ; Volume 44, Issue 2 , 2009 , Pages 128-136 ; 1478422X (ISSN) Shayegani, M ; Ghorbani, M ; Afshar, A ; Rahmaniyan, M ; Sharif University of Technology
    2009
    Abstract
    Corrosion of mild steel in aqueous solutions containing carbon dioxide was modelled under condition that protective iron carbonate films formed on the steel surface. In this model, the film form on the steel surface due to precipitation of iron carbonate from saturated solution. The precipitation of iron carbonate produces a porous layer on the steel surface, reducing the diffusion of species toward the steel surface. If the precipitation rate is high, the porosity decreases and the mass transport becomes slower. Therefore, formation of protective layers on the steel surface reduces the corrosion rate. In this case, the corrosion processes are controlled with diffusion of species. The model... 

    Natural gas sweetening using ionic liquids, experiment and modeling

    , Article CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference PRES, 25 August 2012 through 29 August 2012 ; August , 2012 Safavi, M ; Ghotbi, C ; Jalili, A. H ; Taghikhani, V ; Sharif University of Technology
    2012
    Abstract
    A discussion covers the general descriptions and basic properties of ionic liquids (IL); main application areas, e.g., solvent replacement, purification of gases, homogenous and heterogeneous catalysis, biological reactions media, and removal of metal ions; and results of the research and works relating to gas solubility measurement and thermodynamic modeling of gas solubility with focus on acid gas solubility in IL. This is an abstract of a paper presented at the CHISA 2012 - 20th International Congress of Chemical and Process Engineering and PRES 2012 - 15th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (Prague, Czech Republic... 

    Feasibility Study of Using Molten Carbonate Fuel Cell for CO2 Capture from Exhaust Gases of Internal Combustion Engines

    , M.Sc. Thesis Sharif University of Technology Habibzade, Samane (Author) ; Roshandel, Ramin (Supervisor) ; Shaygan, Jalaloddin (Co-Advisor)
    Abstract
    According to, increasing use of energy in the world, issues such as increasing reenhouse gas’ emission, rising temperature on planet earth and air pollution have appeared Carbon dioxide is a major greenhouse gas that has a significant impact on increasing the temperature of earth. In recent years, attentions to carbon dioxide capturring and sequestration technologies have been increased. In this project molten carbonate fuel cell which is used as a new method for separating carbon dioxide from gaseous compounds of combustion process, is discussed. The aim of the project is to, investigate technical and
    economic feasibility of using molten carbonate fuel cell for separating carbon... 

    Experimental study of asphaltene precipitation behavior during miscible carbon dioxide injection

    , Article Energy Sources, Part A: Recovery, Utilization and Environmental Effects ; Vol. 36, issue. 14 , July , 2014 , pp. 1523-1530 ; ISSN: 15567036 Alizadeh, A ; Nakhli, H ; Kharrat, R ; Ghazanfari, M. H ; Aghajani, M ; Sharif University of Technology
    Abstract
    Many reservoir and production engineers face asphaltene precipitation as a major problem during miscible carbon dioxide flooding projects. Experimental studies regarding asphaltene precipitation are therefore employed to assist in selecting appropriate facilities and proper operation schemes. During this study, a series of high pressure, high temperature experiments are designed and performed to analyze asphaltene precipitation behavior of an Iranian light reservoir crude at reservoir conditions due to natural production and miscible CO2 gas injection. For both sets of experiments, two different temperature levels (including reservoir temperature) are selected to investigate the role of... 

    Emission assessment of alternative dam structure types, a novel approach to consider in new dam projects

    , Article Construction Innovation ; Volume 21, Issue 2 , 2021 , Pages 203-217 ; 14714175 (ISSN) Alvanchi, A ; Bajalan, Z ; Iravani, P ; Sharif University of Technology
    Emerald Group Holdings Ltd  2021
    Abstract
    Purpose: Dams require high-volume of construction materials and operations over the life cycle. This paper aims to select a proper type of dam structure that can significantly contribute to the sustainability of dam projects. Design/methodology/approach: This research proposes a complementary fuel consumption and carbon dioxide (CO2) emission assessment method for the alternate dam structure types to assist decision-makers in selecting sustainable choices. Related equations are developed for two common earthen and rock-fill dam structures types in Iran. These equations are then successfully applied to two real dam project cases where the significance of the achieved results are assessed and... 

    Synthesis of Hybrid Nano-Adsorbent for CO2 Adsorption

    , M.Sc. Thesis Sharif University of Technology Pourrangbar, Mohammad (Author) ; Molaei Dehkordi, Asghar (Supervisor) ; Rashidi, Ali Moradi (Supervisor)
    Abstract
    CO2 as a green house gas plays a significant role in the global warming and weather changes. Absorption by means of amine solutions is the main industrial technique for separating of CO2 from gas mixtures. Hazards associated with high temperature during solvent recovery, large size of equipment, corrosion, solvent degradation, and other reasons has made researchers to look for alternative processes such as adsorption. The aim of this study was to synthesis and modify the nano adsorbent for CO2 capture. To fulfill this purpose, various nano silica structures were synthesized and the amount of adsorption of each sample was determined. To investigate the performance capability nano_adsorbents,... 

    Carbon Dioxide Recovery From Flue Gases by Means of Appropriate Absorbents

    , M.Sc. Thesis Sharif University of Technology Lotfi Varnoosfaderani, Mohammad (Author) ; Molaei Dehkordi, Asghar (Supervisor)
    Abstract
    Due to the increasing concentration of greenhouse gases in the earth's atmosphere and their destructive consequences, many scientists and researchers have turned to preventing the emission of greenhouse gases, such as carbon dioxide. One of the primary sources of carbon dioxide emissions is flue gases. Carbon dioxide is one of the most important greenhouse gases, the release of which causes global temperature increase and climate change. One of the options for reducing carbon dioxide emissions from gas streams is using reactive amine solvents, considered the most critical technologies for carbon dioxide removal. The only commercially available carbon dioxide separation method is absorption... 

    Investigation of the enhanced solubility of fluorinated methanes in CO2 by Monte Carlo simulation: Absolute free energy of solvation and structural properties of solution

    , Article Journal of Supercritical Fluids ; Volume 40, Issue 1 , 2007 , Pages 40-49 ; 08968446 (ISSN) Tafazzoli, M ; Khanlarkhani, A ; Sharif University of Technology
    Elsevier  2007
    Abstract
    The absolute free energy of solvation of methane (CH4) and its fluorinated forms (CH3F, CH2F2, CHF3 and CF4) have been computed via statistical perturbation theory (SPT) in the NPT ensemble at four thermodynamical states (whitin liquid and supercritical regions), in the context of Monte Carlo Simulations. Thermodynamical interpretation of the observed trend in the absolute free energy of solvation in different states reveals an exothermic solvation with ΔSslv < 0 (entropically unfavorable solvation) that the intermolecular interactions play an important role in the solvation process. The fluorinated methanes are confirmed to control the mutual arrangement of neighboring CO2 molecules and the... 

    Treatment of oil-contaminated drill cuttings of South Pars gas field in Iran using supercritical carbon dioxide

    , Article Iranian Journal of Science and Technology, Transaction B: Engineering ; Volume 30, Issue 5 , 2006 , Pages 607-611 ; 03601307 (ISSN) Goodarznia, I ; Esmaeilzadeh, F ; Sharif University of Technology
    2006
    Abstract
    New treatment technologies are currently being investigated for the treatment of contaminated drilling waste mud with oil. Supercritical fluid extraction is a promising technology that could be effectively used to extract this contaminated drilling waste mud. In this work, one step extraction efficiency of supercritical carbon dioxide to drilling waste mud of South Pars gas field has been investigated at a range of temperatures (55 to 79.5 °C), and over a pressure range of 160 to 220 bar. Extraction efficiencies were calculated based on cuttings weight loss. Results show that approximately 28.45% of cuttings weight loss in one step extraction at a pressure of 200 bar and temperature of 60 °C... 

    CO2 separation by supported liquid membranes synthesized with natural deep eutectic solvents

    , Article Environmental Science and Pollution Research ; Volume 28, Issue 26 , 2021 , Pages 33994-34008 ; 09441344 (ISSN) Saeed, U ; Khan, A. L ; Gilani, M. A ; Aslam, M ; Khan, A. U ; Sharif University of Technology
    Springer Science and Business Media Deutschland GmbH  2021
    Abstract
    Betaine-based natural deep eutectic solvents (NADESs), a new class of green solvents, were immobilized into a porous polyvinylidene fluoride (PVDF) support and evaluated for the separation of CO2 from CO2/N2 and CO2/CH4 mixtures. Two types of NADESs were synthesized by mixing betaine (hydrogen bond acceptor-HBA) with malic acid and tartaric acid (hydrogen bond donors-HBD) respectively. FTIR and Raman spectroscopy were studied to confirm the synthesis and purity of the NADESs. The thermal strength of the NADESs was investigated using thermogravimetric analysis. The gas permeation results of the fabricated NADES-based-supported liquid membranes (NADES-SLMs) showed that the permeability of CO2... 

    Supercritical extraction of phenanthrene in the crossover region

    , Article Journal of Chemical and Engineering Data ; Volume 50, Issue 1 , 2005 , Pages 49-51 ; 00219568 (ISSN) Esmaeilzadeh, F ; Goodarznia, I ; Sharif University of Technology
    2005
    Abstract
    An experimental flow-type apparatus has been tested for the separation of phenanthrene from a mixture of solids (phenanthrene, anthracene, and carbazole) and also from anthracene oil of the Isfahan Coal Tar Refining Company based on retrograde crystallization phenomena in supercritical carbon dioxide. The results show that by exploiting the crossover effect it is possible to obtain (82 and 24) mass % of phenanthrene from the solid mixture and anthracene oil, respectively, with a single temperature cycle  

    Separation of phenantrene from anthracene oil using supercritical carbon dioxide

    , Article Chemical Engineering and Technology ; Volume 28, Issue 1 , 2005 , Pages 106-109 ; 09307516 (ISSN) Esmaeilzadeh, F ; Goodarznia, I ; Sharif University of Technology
    2005
    Abstract
    Supercritical fluid extraction (SFE) is a relatively new separation technique that has received much attention in recent years. This process is an alternative to distillation or liquid extraction. Its main advantage over the conventional ones is that the dissolved extract may be completely separated from the supercritical fluid simply by decreasing the pressure. In recent years considerable effort has been devoted to the measurement of equilibrium solubility data for solids in supercritical fluids. A coal tar distillate, anthracene oil, which contains 34.46 mass-% phenanthrene, 33.8 mass-% anthracene, 13.89 mass-% carbazole and other impurities, was used as the model mixture. In this study,... 

    Separation of CO2 from CO2-air Mixture Using ILM Membrane Containing TEG-DEA

    , M.Sc. Thesis Sharif University of Technology Ahadi, Hossein (Author) ; Bastani, Dariush (Supervisor)
    Abstract
    CO2 separation from air was investigated in this work. An immobilized liquid membrane (ILM) which contains triethylene glycol (TEG) and diethanolamine (DEA) was used for this purpose. In this kind of membranes a liquid, which improves permeability of gas species through the membrane, fills the pores of a polymeric membrane as support. Because of low vapor pressure of solution, liquid loss was negligible. Transport of CO2 was facilitated due to reversible chemical reaction between CO2 and amine solution. A polyvinylidene fluoride (PVDF) membrane was chosen to have chemical resistance against the solution and prevent destruction of polymer by solution. A flat sheet and hydrophilic PVDF was... 

    Modeling and Forecasting of Carbon Dioxide Concentration over the Australian Daintree Rainforest

    , M.Sc. Thesis Sharif University of Technology imani, Hossein (Author) ; Moghim, Sanaz (Supervisor)
    Abstract
    In recent decades, the concentration of carbon dioxide in the atmosphere has increased. Carbon dioxide is a greenhouse gas that raises the Earth’s temperature, and it can endanger life on Earth. This study uses the 6.2 version of the Regional Atmospheric Modeling System (RAMS) with its simple biosphere model (SiB-2) to simulate and forecast the concentration of carbon dioxide over the Daintree rainforest in Australia. This analysis helps to better understand the interaction between the biosphere and the atmosphere. Results of the carbon dioxide simulation were compared and validated with the observed values of the satellite product (MultiInstrumentFusedXCO2). Based on effective parameters,... 

    Prediction of CO2 equilibrium moisture content using least squares support vector machines algorithm

    , Article Petroleum and Coal ; Volume 58, Issue 1 , 2016 , Pages 27-46 ; 13377027 (ISSN) Ghiasi, M.M ; Abdi, J ; Bahadori, M ; Lee, M ; Bahadori, A ; Sharif University of Technology
    Slovnaft VURUP a.s  2016
    Abstract
    The burning of fossil fuels such as gasoline, coal, oil, natural gas in combustion reactions results in the production of carbon dioxide. The phase behavior of the carbon dioxide + water system is complex topic. Unlike methane, CO2 exhibits a minimum in the water content. These minima cannot be predicted by existing methods accurately. In this communication, two mathematical-based procedures have been proposed for accurate computation of CO2 water content for tempe-ratures between 273.15 and 348.15 K and the pressure range between 0.5 and 21 MPa. The first is based on least squares support vector machine (LSSVM) algorithm and the second applies multilayer perceptron (MLP) artificial neural... 

    A design procedure for the assessment of carbon capturing and utilization of flue gas from power plant using experimental data

    , Article Chemical Engineering Research and Design ; 2017 ; 02638762 (ISSN) Rostami Dehjalali, F ; Avami, A ; Sharif University of Technology
    Institution of Chemical Engineers  2017
    Abstract
    The high dependence of the atmospheric carbon dioxide emissions on fossil fuels has led it to increment. Process design along with the economic aspects, improves the technology diffusion of the carbon capturing. In the pressure swing adsorption as a promising carbon capturing technology, increasing the pressure leads to more adsorbed amount of carbon dioxide and energy consumption of compressor, which is a source for carbon dioxide emission. Experimental data shows that for pressures between 3 to 5bar, the avoided CO2 is in maximum rate. The economic analysis reveals that the pressure of 3bar is appropriate. Also, the utilization of CO2 in the aerogel production, as a nano-based thermal... 

    A design procedure for the assessment of carbon capturing and utilization of flue gas from power plant using experimental data

    , Article Chemical Engineering Research and Design ; Volume 131 , 2018 , Pages 393-405 ; 02638762 (ISSN) Rostami Dehjalali, F ; Avami, A ; Sharif University of Technology
    Institution of Chemical Engineers  2018
    Abstract
    The high dependence of the atmospheric carbon dioxide emissions on fossil fuels has led it to increment. Process design along with the economic aspects, improves the technology diffusion of the carbon capturing. In the pressure swing adsorption as a promising carbon capturing technology, increasing the pressure leads to more adsorbed amount of carbon dioxide and energy consumption of compressor, which is a source for carbon dioxide emission. Experimental data shows that for pressures between 3 to 5 bar, the avoided CO2 is in maximum rate. The economic analysis reveals that the pressure of 3 bar is appropriate. Also, the utilization of CO2 in the aerogel production, as a nano-based thermal... 

    Emission assessment of alternative dam structure types, a novel approach to consider in new dam projects

    , Article Construction Innovation ; 2020 Alvanchi, A ; Bajalan, Z ; Iravani, P ; Sharif University of Technology
    Emerald Group Publishing Ltd  2020
    Abstract
    Purpose: Dams require high-volume of construction materials and operations over the life cycle. This paper aims to select a proper type of dam structure that can significantly contribute to the sustainability of dam projects. Design/methodology/approach: This research proposes a complementary fuel consumption and carbon dioxide (CO2) emission assessment method for the alternate dam structure types to assist decision-makers in selecting sustainable choices. Related equations are developed for two common earthen and rock-fill dam structures types in Iran. These equations are then successfully applied to two real dam project cases where the significance of the achieved results are assessed and... 

    Solubility calculation of oil-contaminated drill cuttings in supercritical carbon dioxide using statistical associating fluid theory (PC-SAFT)

    , Article Chemical Engineering and Technology ; Volume 31, Issue 1 , 2008 , Pages 66-70 ; 09307516 (ISSN) Esmaeilzadeh, F ; Goodarznia, I ; Daneshi, R ; Sharif University of Technology
    2008
    Abstract
    Supercritical fluid extraction is a new technology that could be effectively used to treat oil-contaminated drill cuttings generated during drilling for oil and gas. In this work, the solubility of oil-contaminated drill cuttings in supercritical carbon dioxide is obtained by an experimental flow type apparatus. The solubility was measured at 200 bar pressure, over a temperature range of 55-79.5°C. The measured solubility and experimental data for oil in drill cuttings were correlated using the PC-SAFT, PR and SRK EOS models, without any adjustable parameters. Average absolute derivations of less than 15.1 %, 98.7 %, and 99.3 % are achieved between predicted and experimental values for the...