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membrane-technology
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Study and Preparation of Two-Component Urethane_Based Adhesives for Using in Membrane Technology
, M.Sc. Thesis Sharif University of Technology ; Musavi, Abbas (Supervisor) ; Soltanieh, Mohammad (Supervisor)
Abstract
Membrane Technology is rapidly growing all over the world because of many applications. In all of this applications , use of adhesive ( between membranes and wall ) is necessary. selection of appropriate adhesive for membrane is very important in order to membrane has best performance and lifetime .Adhesives used in membrane technology must have good adhesion and suitable hardness . One of the newest adhesives used in membrane technology is two-component polyurethane adhesive. PU adhesives make strong and durable bond and have good flexibility which is an advantage for membrane technology.MDI isocyanate is used in most of commercial PU adhesives’ formulation. But in this study , modified MDI...
Preparation of Suitable Membrane for NaOH Solution Enrichment
, M.Sc. Thesis Sharif University of Technology ; Musavi, Abbas (Supervisor) ; Bastani, Dariush (Supervisor)
Abstract
Sodium Hydroxide production industry is among the largest chemical industries that annually produces 66 million tons worldwide. NaOH which is produced through electrochemical cells needs to be further enriched. The use of membrane technology as a substitute for conventional processes has been a point of interest. Thin film composite membrane is among favorable membrane because of its ability to be customized layer by layer individually. In this thesis, for the purpose of making an optimized membrane for NaOH enrichment, we studied the preparation conditions and witnessed that by increasing MPD from 1.5 %wt. to 4.5%wt. The flux experiences a minimum at 3.5%wt, which is the maximum for...
Oxygen Enrichment of Air by Membrane Technology to Reduce Energy Consumption
, M.Sc. Thesis Sharif University of Technology ; Bastani, Dariush (Supervisor)
Abstract
In various industries, for energy production, fossil fuels are burned. Oxygen needed for combustion, taken directly from the ambient air; So that the inert gas is about 80%. The presence of this inert gas, mainly nitrogen, reduce combustion efficiency and increase the use of combustible material. In this project with the help of membrane technology, was used to remove the amount of nitrogen in the air so that the incoming air into the combustion chamber is enriched with oxygen. For this purpose, several gas separation membrane was applied and evaluated. Then, according to the oxygen enrichment, fuel efficiency and the amount of savings, increasing chamber temperature, reduction manufacturing...
Optimization of cleaning procedure for polyethersulfone (PES) membrane by a statistically designed approach
, Article Recent Patents on Chemical Engineering ; Volume 6, Issue 2 , August , 2013 , Pages 107-115 ; 18744788 (ISSN) ; Sargolzaei, J ; Shayegan, J ; Bahadori, T ; Sharif University of Technology
Abstract
Physical separation methods, especially membrane technology, can be a good substitute for biological wastewater treatment, due to its simple constructions and operations. There are many papers and patents in this field. Membranes need to be cleaned periodically to be able to operate economically, and need to be replaced after a while. Several factors can influence the membrane cleaning procedure, including pressure of backwash, acid and base concentration, duration of forward washing, and duration of acid-base backwashing. In this study the effect of these parameters was investigated to find an optimum condition which could result in a good polyethersulphone (PES) membrane cleaning with less...
Scenario based priority setting of R&D issues: A case study of membrane technology in national iranian gas industry
, Article 2008 Portland International Center for Management of Engineering and Technology, Technology Management for a Sustainable Economy, PICMET '08, Cape Town, 27 July 2008 through 31 July 2008 ; 2008 , Pages 1497-1505 ; 9781890843175 (ISBN) ; Sahafzadeh, M ; Emamian, S. M. S ; Irankhah, A ; Sharif University of Technology
2008
Abstract
In this paper, to set R&D priorities at sector level, a developed method is proposed which is combined of scenario planning and critical technologies method and then applied for prioritizing R&D issues of membrane technology in National Iranian Gas Company (NIGC). In the first phase (through 3 steps), scope of NIGC is mapped using national documents and viewpoints of experts and managers. This map includes main process of gas processing and gas conversions. Then strategic goals of gas industry including gas exports, conversions, injection and internal use, are developed. Also Strategic Technology Units (STUs) are identified and twenty distinct membrane technologies including technologies of...
Novel nanocomposite polyethersulfone- antimony tin oxide membrane with enhanced thermal, electrical and antifouling properties
, Article Polymer ; Volume 163 , 2019 , Pages 48-56 ; 00323861 (ISSN) ; Hosseini, S. A ; Ma, G ; McGregor, M ; Sadrzadeh, M ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
Application of organic−inorganic nanocomposite membranes for water treatment is exceptionally growing owing to their tunable functionalities in addition to their enhanced permeation and antifouling propensity. In the present work, novel nanocomposite polyethersulfone (PES) membrane was synthesized using antimony-doped tin oxide (ATO) nanoparticles (NPs) via phase separation technique. It was found that the modified PES-ATO nanocomposite membranes exhibited significantly higher fouling resistance and larger permeate flux recovery ratio when tested with oil sands produced water than unmodified PES membranes. Furthermore, the PES-ATO membranes provided 40% more organic matter removal compared...
Applicability of membrane reactor technology in industrial hydrogen producing reactions: Current effort and future directions
, Article Journal of Industrial and Engineering Chemistry ; Volume 104 , 2021 , Pages 212-230 ; 1226086X (ISSN) ; Binazadeh, M ; Sohrabi, R ; Sharif University of Technology
Korean Society of Industrial Engineering Chemistry
2021
Abstract
Potent carbon-neutral energy carriers bring a vital solution for sustained industrialization and environmental protection. Hydrogen as a novel zero-emission energy carrier offers more than twice energy per unit mass compared to other fuels. Membrane reactor technology transforms gray hydrogen to blue by selective hydrogen separation and carbon dioxide capture from the product mixture. Moreover, improved reactant conversion during reversible steam reforming of methane, methanol, and ethanol; water gas-shift; and dehydrogenation of cyclic and aliphatic hydrocarbons as well as enhanced hydrogen yield are results of selective and distributed hydrogen separation from membrane reactor. In this...
Fabrication and performance of polysulfone/H2O2-g-C3N4 mixed matrix membrane in a photocatalytic membrane reactor under visible light irradiation for removal of natural organic matter
, Article Separation and Purification Technology ; Volume 285 , 2022 ; 13835866 (ISSN) ; Heydari, H ; Khansanami, M ; Vatanpour, V ; Mousavi, S. A ; Sharif University of Technology
Elsevier B.V
2022
Abstract
The coupling of photocatalysis with membrane technology, which is known as photocatalytic membrane reactors (PMRs), has received great consideration in recent years and become a promising approach with the high potential to improve the fouling of membranes. In this paper, the photocatalyst of g-C3N4 treated with H2O2 was incorporated with a polysulfone membrane to enhance the anti-fouling properties of the membrane. AFM, FE-SEM images, porosity, and contact angle analysis indicated that the membrane properties like hydrophilicity, porosity, and surface roughness were improved. Also, UV–visible DRS, PL spectra, EIS analysis confirmed that the treated g-C3N4 (H2O2-g-C3N4) had high light...
Polymeric mixed matrix membranes containing zeolites as a filler for gas separation applications: A review
, Article Journal of Industrial and Engineering Chemistry ; Volume 19, Issue 2 , 2013 , Pages 375-393 ; 1226086X (ISSN) ; Esmaeili, N ; Asadollahi, M ; Sharif University of Technology
2013
Abstract
Polymeric membrane technology has received extensive attention in the field of gas separation, recently. However, the tradeoff between permeability and selectivity is one of the biggest problems faced by pure polymer membranes, which greatly limits their further application in the chemical and petrochemical industries. To enhance gas separation performances, recent works have focused on improving polymeric membranes selectivity and permeability by fabricating mixed matrix membranes (MMMs). Inorganic zeolite materials distributed in the organic polymer matrix enhance the separation performance of the membranes well beyond the intrinsic properties of the polymer matrix. This concept combines...
Mass transfer through PDMS/zeolite 4A MMMs for hydrogen separation: Molecular dynamics and grand canonical Monte Carlo simulations
, Article International Communications in Heat and Mass Transfer ; Volume 108 , 2019 ; 07351933 (ISSN) ; Amirkhani, F ; Khadem, S. A ; Rezakazemi, M ; Asghari, M ; Shirazian, S ; Sharif University of Technology
Elsevier Ltd
2019
Abstract
In industry, utilizing membrane separation technology to purify natural gas streams is of remarkable significance. Molecular Simulation was used in the current article to study the structural and gas separation properties of polydimethylsiloxane (PDMS)/zeolite 4A Mixed Matrix Membranes (MMMs). To explore the optimal performance of MMMs, several structural analyses, namely Fractional Free Volume (FFV), Radial Distribution Function (RDF), X-Ray Diffraction (XRD) and also Glass Transition Temperature (Tg) as one of the most important properties of membranes have been evaluated. Also, the solubilities and diffusivities of periodic cells were respectively measured using MSD and adsorption...
Recent advances in aqueous virus removal technologies
, Article Chemosphere ; Volume 305 , 2022 ; 00456535 (ISSN) ; Shokrani, H ; Shokrani, A ; Jabbour, K ; Abida, O ; Mousavi Khadem, S. S ; Habibzadeh, S ; Sonawane, S. H ; Saeb, M. R ; Bonilla-Petriciolet, A ; Badawi, M ; Sharif University of Technology
Elsevier Ltd
2022
Abstract
The COVID-19 outbreak has triggered a massive research, but still urgent detection and treatment of this virus seems a public concern. The spread of viruses in aqueous environments underlined efficient virus treatment processes as a hot challenge. This review critically and comprehensively enables identifying and classifying advanced biochemical, membrane-based and disinfection processes for effective treatment of virus-contaminated water and wastewater. Understanding the functions of individual and combined/multi-stage processes in terms of manufacturing and economical parameters makes this contribution a different story from available review papers. Moreover, this review discusses...
Concurrent photocatalytic degradation and filtration with bi-plasmonic TiO2 for wastewater treatment
, Article Micro and Nano Letters ; Volume 16, Issue 3 , 2021 , Pages 194-202 ; 17500443 (ISSN) ; Amoli Diva, M ; Sadighi Bonabi, R ; Sharif University of Technology
John Wiley and Sons Inc
2021
Abstract
A new photocatalytic filtration membrane was prepared by grafting of Ag–Au bi-plasmonic shell-on TiO2@Fe3O4 nanoparticles as a magnetically-separable heterogeneous photocatalyst to a poly acrylic acid-modified cellulose acetate membrane for decomposition and removal of methyl orange as a model pollutant from textile wastewater samples. Eight photocatalysts including five Au NPs-modified TiO2@Fe3O4 NPs and three Ag-Au bi-plasmonic NPs-decorated TiO2@Fe3O4 NPs with different shell thickness were synthesized and characterized by TEM, UV–vis, and SEM techniques and their photocatalytic activity was assessed using two radiation sources. After selection of optimum photocatalyst and modification of...