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International Journal of Chemical Engineering and Analytical Science Vol. 2, No. 1, 2017, pp. 1-8 http://www.aiscience.org/journal/ijceas Study of Some Electrolysis Parameters for Chlorine and Hydrogen Production Using a New Membrane Electrolyzer Domga1, Richard Domga1, Guy Bertrand Noumi2, *, Jean Bosco Tchatchueng1 1Department of Applied Chemistry, National School of Agro-industrial Sciences, University of Ngaoundere, Ngaoundere, Cameroon 2Department of Chemistry, Faculty of Science, University of Ngaoundere, Ngaoundere, Cameroon Abstract This work reports the most important parameters during brine electrolysis. Herein, cells design was built and optimized for chlorine and hydrogen production using graphite electrodes. These electrodes were from recycling batteries. Also, a series of experiments were conducted in order to test the effect of the space between the electrodes on minimal cell voltage. The results clearly show that when the space between the electrodes decreases, the cell voltage decreases too. Thus, the optimum value was 0.75 cm and the minimum cell voltage with this gaps was 2.83V. Likewise, the effects of some operating parameters like electrolytes concentration and temperature on conductivity were studied. The optimum conditions for brine electrolysis were 320 g.L-1 NaCl (pH=2), 24% NaOH, T = 80°C. To express the efficiency of electrochemical reactions, two types of current efficiency were calculated based on Faraday’s law of electrolysis. The current efficiencies were 81% and 83% respectively for chlorine and hydrogen production. Keywords Electrolysis, Current Efficiency, Conductivity, Chlorine, Hydrogen, Electrodes Received: July 19, 2016 / Accepted: August 4, 2016 / Published online: November 19, 2016 @ 2016 The Authors. Published by American Institute of Science. This Open Access article is under the CC BY license. http://creativecommons.org/licenses/by/4.0/ 1. Introduction The chlor-alkali industry (industry that produces chlorine and alkali, sodium hydroxide or potassium hydroxide, by electrolysis of a salt solution), occupies an important position in the global chemical trade. Chlorine and sodium hydroxide (caustic soda) are among the top 10 chemicals produced in the world, and involved in the manufacturing of a myriad of products that are used in day-to-day life [1]. Chlorine is used in production of most (more than 85%) pharmaceuticals, and is involved in the production of a large part of all other modern chemicals and materials. In addition, for every ton of chlorine made, 1.1 tons of caustic soda (100%) and 0.03 ton of hydrogen are produced [2]. Caustic soda is used in chemical industries and for manufacture of products such as * Corresponding author E-mail address: gnoumi@yahoo.fr (G. B. Noumi) soap, detergents, textiles, paints, glass and ceramics [3]. Hydrogen can be used as a chemical reagent in integrated production sites, for energy generation in fuel cells or in electrolyzer with depolarized cathodes. Chlorine and caustic soda are the base elements of 60% of Europe’s chemical industry production [4]. The chlorine production of a country is an indicator of the state of development of its chemical industry [5, 6]. Chlor-alkali process is performed in an electrolytic cell called electrolyzer. It is a reactor vessel, filled with an electrolytic bath or electrolyte, in which the electrodes are immersed and electrically connected via busbars to power supply [7]. During the electrolysis of brine, chlorine is generated at the anode while sodium hydroxide and hydrogen are produced at the cathode. Total cell reaction proceeds through thePDF Image | Electrolysis Parameters for Chlorine and Hydrogen Production
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