محمد نوري

In this thesis, a water an‎d oil mixture (petroleum compounds) was separated by filtration. The separability of water an‎d oil was investigated with the aid of stainless steel mesh coated with tungsten oxide an‎d the wetting properties of the resulting filter. For this purpose, 0.012 mol of sodium tungstate die-hydrate in powder form was dissolved in 25 ml of deionized water, an‎d after forming a homogeneous solution, the pH was adjusted by dro‎pwise addition of 2 molar HCl acid while simultaneously measuring the pH with pH paper. Upon reaching the pH 3, the solution volume was diluted with deionized water to 150 ml, the volume of the Teflon chamber of the autoclave reactor. Finally, 1 gr oxalic acid was added to the diluted solution as a chelating agent, an‎d the entire solution was transferred to the Teflon chamber. A 510 cm2 piece of stainless steel mesh was immersed in the solution an‎d, after closing the chamber door, placed in an oven at 220 C temperature for 4 hr. After cooling, the tungsten oxide-coated stainless steel mesh was placed in a furnace set at 350 C to be calcined for 1 hr. Parameters that were changed during filter fabrication were the concentration of the main reactant, the pH of the reaction solution, the reaction temperature, an‎d finally the reaction time. After washing an‎d drying at room temperature, the calcined filter was subjected to characterization tests such as XRD, FTIR, an‎d EDS analyses of the coating formed on the mesh, FE-SEM an‎d TEM imaging, an‎d finally static contact angle measurement. The test results all indicated the formation of a WO3 nanostructure coating on both sides of the stainless steel mesh. In an experimental separation setup used to investigate the behavior of the fabricated filter in water an‎d oil separation, the performance of the filters was eva‎luated in terms of efficiency an‎d separation rate of the water an‎d oil mixture. The best filter produced was capable of separating a water an‎d hydrocarbon mixture with an intensity of 9870 L.m-2.hr-1 with a purity of over 98%. The contact angle measurements of water an‎d oil on this mesh showed that the wet mesh is hydro‎philic in air an‎d oleophobic when submerged in water. So this mesh can be used to separate water an‎d oil mixtures. The mechanism of the wetting behavior of the fabricated filter is mainly related to the hierarchical structure of the surfaceʹs nanospherical coating an‎d its relative roughness, thus increasing the hydro‎philicity of the surface. Comparing the performance of fabricated filter with a filter fabricated by immersing the mesh in a solution containing zinc oxide nanostructures showed that the filter coated with tungsten oxide has much better performance. Compared to previous studies with water separation flux slightly less than 3100 L/m2/hr, the flux an‎d separation efficiency in this study are remarkable.

جداسازي آب از نفت , نانوفيلتر , اكسيد تنگستن , مش استيل , هيدروترمال

oil de-watering , Nano filter , Tungsten oxide , stainless steel mesh , Hydrothermal

Mohamad Noori

Dr. Sadeghi- Dr. Rashidi