Investigation of Producing Chlorine with Electro Dialysis Method and the Effect of Operating Parameters: A Review

With emergence of production processes of Sodium Hydroxide with mercury and diaphragmatic Electrolysis methods and identifying harmful effects of using mercury and Asbestos and also environmental and economic problems, these processes are turned to one of difficulties and concerns of Petrochemical Industry and countries intends to eliminate these processes and to use membrane cell method. The chlor-alkali industry is the industry that produces chlorine (Cl2) and alkali, sodium hydroxide (NaOH) or potassium hydroxide (KOH), by electrolysis of a salt solution. The main technologies applied for chlor-alkali production are mercury, diaphragm and membrane cell electrolysis, mainly using sodium chloride (NaCl) as feed or to a lesser extent using potassium chloride (KCl) for the production of potassium hydroxide. Membrane cell method has some benefits including: reducing consumer energy to 25-30 percents, eliminating the pollution of chlorine productions. For environment, producing NAOH and chlorine with membrane cell method has a special superiority on mercury and diaphragm methods due to elimination of mercury and asbestos. Membrane cell method is economical. Because of lower consumption of electricity energy, elimination of extra steps such as diffusion on mercury cell, decrease in cells surface and decrease in human forces.Addition to the way of penetrating to membrane (Diffusion), in this investigation the effect of operating parameter are examined; such as concentration, temperature, pressure, PH, current density and input flow rate on membrane cell operation, the increase in penetration and chlorine production.

Chlorine, Membrane Cell, Electrolysis, Diffusion, Anode,Cathode