ساخت و ارزيابي الكترود نفوذ اكسيژن جهت استفاده در كلر-آلكالي پيشرفته

چكيده انگليسي :

Manufacture and evaluating of gas diffusion electrode for using in advanced chlor alkali cell Meysam soleymani m soleymani@ce iut ac ir May 27 2009 Department of Chemical Engineering Isfahan University of technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi A Moheba E Joudakib a Email Ahmad@cc iut ac ir b Email E Joudaki@araku ac ir Abstract Today the electrochemical chlor alkali process is the most common method for simultaneous production of chlorine gas and caustic solution which accomplishes by three methods of mercury process diaphragm process and membrane process Among these the membrane chlor alkali technology is the most economical and environmental friendly method Therefore other methods will be forced to change to membrane process in future However the membrane chlor alkali process is one of the most expensive processes in chemical industries from the energy consumption point of view Therefore studies for reduction in energy consumption of this process have led to major improvements in the structure of this process By replacement of hydrogen generating cathodes with porous and diffusible oxygen reduction cathodes and change in the cathodic reaction of the process necessary cell voltage and therefore energy consumption can be reduced as much as 30 at current density of 0 4 A cm2 Chlor alkali process using oxygen reduction cathode known as advanced chlor alkali process despite of considerable reduction in the energy consumption for mass unit has some drawbacks The most important problem along with advanced chlor alkali process is production of an undesirable intermediate product called hydrogen peroxide which is generated by a secondary oxygen reduction reaction Hydrogen peroxide can cause serious problems during the operation of the cell by intensifying corrosion of the cathode surface and sodium peroxide precipitation on this electrode at high sodium hydroxide concentrations The main goal of this project was synthesis and evaluation of the performance of an alloy catalysis with capability of preventing from the undesired production of hydrogen peroxide for application in the advanced chlor alkali process To this aim at first nano size particles of alloy catalysts of perovskite La1 xCaxMnO3 were synthesized by modification in one of the most recent methods for synthesis of nano particles to increase the surface area of the catalyst particles Then the structure and chemical composition of the synthesized catalyst particles were characterized by different characterizations test methods Also the efficiency of the nano size catalyst particles was evaluated before and after manufacturing of oxygen diffusion cathode for preventing from production of unwanted hydrogen peroxide product Experimental evaluations showed that the synthesized catalysis of La0 4Ca0 6MnO3 with specific surface area of 40 m2 gr beside preventing from production of the mentioned unwanted product was able to reduce the energy consumption of the advanced chlor alkali cell by working at the ideal voltage of 2 25 volt In Addition the pdfMachine is a pdf writer that produces quality PDF files with ease Get yours now Thank you very much I can use Acrobat Distiller or the Acrobat PDFWriter but I consider your product a lot easier to use and much preferable to Adobe s A Sarras USA

سليماني، ميثم

ساخت و ارزيابي الكترود نفوذ اكسيژن جهت استفاده در كلر-آلكالي پيشرفته

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