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Electrochemical Desulfurization of Sample Oil
, Ph.D. Dissertation Sharif University of Technology ; Farhadi, Fatolla (Supervisor) ; Shahrokhi, Mohammad (Co-Supervisor)
Abstract
Since, presence of sulfur compounds in fuels leads to environmental pollution and deacrese of fuel quality, fuel desulfurization should be considered for enhancing the fuel charachteristics. Electrochemical desulfurization was recogonized as one of desulfurization techniques that uses anode and cathode in an electrolytic environment under mild temperature and pressure. In this research, electrochemical desulfurization of crude gas-oil has been studied over electrodes of copper and stainless steel in the presence of NaOH and sulfuric acid. In this research, the effects of operational prameters like stirring rate, temperature, applied potential, sodium hydroxide/sulfuric acid addition as...
Adsorption Process Modeling by Rigorous Solution Method, on the Packed Bed Filled Zeolite
, M.Sc. Thesis Sharif University of Technology ; Rashtchian, Davood (Supervisor) ; Taghikhani, Vahid (Supervisor) ; Farhadi, Fatolla (Supervisor)
Abstract
The appearance of water in pipe lines of the natural gas transportation would cause several problems. In this regard, disparate methods have been developed to produce and refine of the natural gas, and one of the most common method is adsorption process. In this study, modeling and simulation of the adsorption process in the packed bed of zeolite 4A has been done. This research includes four steps, first, adsorption process and all types of adsorbent were investigated. Second, using rigorous solution method, equations of mass and energy balance derived. Third, using the collocation method and MATLAB programing, system equations of mass and energy was solved. Finally, accuracy of simulation...
Co-Immobilization of Multi-Enzyme Cascade System into the Metal-Organic Frameworks (MOFs)for the Removal of Microcontaminants and Process Equipment Layout
, M.Sc. Thesis Sharif University of Technology ; Farhadi, Fatolla (Supervisor) ; Yaghmaei, Soheila (Supervisor) ; Ghobadiejad, Zahra (Co-Supervisor)
Abstract
In recent years, the biodegradation of micro-contaminants using enzymes has attracted the attention of many researchers in the field of environment and health. Micro- and nano-scale environments play an important role in enzymatic catalysis that directly affects the activity and stability of enzymes. Therefore, setting a nanoscale environment for enzymes is very important, especially in liquids with undesirable properties (such as pH, temperature, toxicity, etc.) in this work, a method proposed in which the pH and the substrate concentration are regulated for enzymatic catalysis using a metal-organic framework, consisting of Glucose Oxidase (GOx) and Horseradish Peroxidase (HRP) immobilized...