پديد آورنده :
كرامتي ، نرجس
عنوان :
بررسي تجربي كاربردي فرايندهاي غشايي الكترو دياليز والكترودي يونيزاسيون در بازيابي سود از پساب تبديل شده سنتزي برج مراكس
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
مهندسي شيمي
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي شيمي
صفحه شمار :
سيزده، 73 ، [II] ، ص: مصور، نمودار، جدول
يادداشت :
ص.ع. به: فارسي وانگليسي
استاد راهنما :
احمد محب، محمدرضا احساني
توصيفگر ها :
غشاء , مركاپتان , گاز طبيعي
تاريخ نمايه سازي :
88/4/31
استاد داور :
محمد قريشي ، مرتضي صادقي
چكيده فارسي :
به فارسي وانگليسي : قابل رويت در نسخه ديجيتال
چكيده انگليسي :
Experimental investigation on application of ED and EDI processes for NaOH recovery from synthetic converted Merox column waste stream Narjes Keramati Meisameh keramati@gmail com 8 March 2009 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Ahamd Moheb Mohammad Reza Ehsani ahmad@cc iut ac ir ehsanimr@cc iut ac irAbstractExistence of sulphur compounds especially mercaptans in natural gas stream causes corrosion problems in transferlines and storage tanks So it is necessary to reduce the amount of these components to international standard levels The Merox process developed by UOP is the most popular process used for this purpose In this process lightmercaptans are converted to disulfides by using caustic solution with Merox catalyst In the present work recovery of sodium hydroxide from waste stream of prewash section of Merox tower containing Na2S Na2CO3 and excess NaOH by membrane processes of electrodialysis ED andelectrodeionization EDI were studied and effects of operating parameters such as voltage feed flow rate feedconcentration and cell structure have been experimentally investigated The result show that by increasing theapplied voltage the NaOH recovery enhanced and the economy of process decreased while the feed flow rate didnot have sensible effect on NaOH recovery On the other hand for all values of feed flow rate the current increasedwith increasing the applied voltage with similar slope It can be concluded that in our study no concentrationpolarization phenomenon was apparent in any case in the range of the applied voltage used for the experiments Also an exclusive comparison between performances of ED and EDI processes was made Results show that thetotal energy consumption in EDI is higher than ED and this is due to considerable energy consumption for waterdissociation But when specific energy consumption was determined EDI process was found more economicbecause of higher ion separation rate in this process In studying effect of feed concentration the results indicatedthat in system with lower concentration of sodium ion in the feed the NaOH recovery was higher whereas theeconomy of system and sodium ion current efficiency were lower A comparison between two implemented configurations of ED process revealed that in the two compartment cell competition between protons and sodium ions for transferring across the CEM reduces efficiency of sodium ionstransport and with using three compartment cell a higher recovery for NaOH and current efficiency for Na wasobserved Generally as it was forecasted the implemented systems proved that can be considered as promising methods torecover unused caustic from waste stream of Merox process as the NaOH recovery for ED Two Compartment cell ED Three Compartment cell and EDI Three Compartment cell was obtained about 48 75 and 85 respectively However EDI process had noticeable relative advantage in comparison with ED KeyWordsNaOH Recovery Membrane Electrodialysis Electrodeionization Mercaptan
استاد راهنما :
احمد محب، محمدرضا احساني
استاد داور :
محمد قريشي ، مرتضي صادقي
