Search for: sulfur-removal
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    Oxidative desulfurization of Non-hydrotreated kerosene using hydrogen peroxide and acetic acid

    , Article Chinese Journal of Chemical Engineering ; Volume 17, Issue 5 , 2009 , Pages 869-874 ; 10049541 (ISSN) Molaei Dehkordi, A ; Sobati, M. A ; Nazem, M. A ; Sharif University of Technology
    The oxidative desulfurization of a real refinery feedstock (i.e., non-hydrotreated kerosene with total sulfur mass content of 0.16%) with a mixture of hydrogen peroxide and acetic acid was studied. The influences of various operating parameters including reaction temperature (T), acid to sulfur molar ratio (nacid/nS), and oxidant to sulfur molar ratio (nO/nS) on the sulfur removal of kerosene were investigated. The results revealed that an increase in the reaction temperature (T) and nacid/nS enhances the sulfur removal. Moreover, there is an optimum nO/nS related to the reaction temperature and the best sulfur removal could be obtained at nO/nS8 and 23 for the reaction temperatures of 25... 

    Adsorptive desulfurization of wild naphtha using magnesium hydroxide-coated ceramic foam filters in pilot scale: Process optimization and sensitivity analysis

    , Article Chemical Engineering and Processing - Process Intensification ; Volume 152 , 2020 Salehi, E ; Askari, M ; Afshar, S ; Eidi, B ; Aliee, M. H ; Sharif University of Technology
    Elsevier B.V  2020
    Ultra-deep desulfurization for production of clean fuels is of great significance from environmental outlook. In this paper, adsorptive desulfurization (ADS) of wild naphtha was investigated in pilot scale using Mg(OH)2-impregnated aluminosilicate ceramic foam filters (ASCFs) as adsorbent. Effects of four operating parameters including temperature, pressure, adsorption bed length and initial sulfur concentration on sulfur removal efficiency of the process were studied via central composite design of experiment methodology. Sobol's sensitivity analysis was employed to quantitatively determine the impacts of the operating parameters on the removal performance of the separation system. The... 

    Electrochemical oxidative desulfurization for high sulfur content crude gas-oil

    , Article Separation and Purification Technology ; Volume 248 , 2020 Tavan, Y ; Shahrokhi, M ; Farhadi, F ; Sharif University of Technology
    Elsevier B.V  2020
    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... 

    Novel type of four-impinging-jets reactor for Oxidative desulfurization of light fuel oils

    , Article Industrial and Engineering Chemistry Research ; Volume 49, Issue 19 , 2010 , Pages 9339-9348 ; 08885885 (ISSN) Sobati, M. A ; Molaei Dehkordi, A ; Shahrokhi, M ; Ebrahimi, A. A ; Sharif University of Technology
    A novel type of four-impinging-jets reactor (FIJR) has been proposed and tested successfully for the oxidative desulfurization of kerosene as a typical light fuel oil. The FIJR is characterized by a high-intensity mixing chamber located at the bottom of the reactor and equipped with four impinging jets. The influences of various operating and design parameters such as feed flow rate, internozzle distance, jet diameter, and jet Reynolds number on the performance of the FIJR have been carefully investigated. As a result of both the impinging process and shear forces exerted on the phases, the rate of desulfurization in FIJR increased significantly compared to that obtained by a conventional... 

    Study of a newly isolated thermophilic bacterium capable of Kuhemond heavy crude oil and dibenzothiophene biodesulfurization following 4S pathway at 60°C

    , Article Journal of Chemical Technology and Biotechnology ; Volume 83, Issue 12 , June , 2008 , Pages 1689-1693 ; 02682575 (ISSN) Torkamani, S ; Shayegan, J ; Yaghmaei, S ; Alemzadeh, I ; Sharif University of Technology
    Background: To meet stringent emission standards stipulated by regulatory agencies, the oil industry is required to bring down the sulfur content in fuels. As some compounds cannot be desulfurized by existing desulfurizing processes (such as hydrodesulfurization, HDS) biodesulfurization has become an interesting topic for researchers. Most of the isolated biodesulfurizing microorganisms are capable of desulfurization of refined products whose predominant sulfur species are dibenzothiophenes so biocatalyst development is still needed to desulfurize the spectrum of sulfur-bearing compounds present in whole crude. Results: The first desulfurizing bacterium active at 60 °C has been isolated,...