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http://dx.doi.org/10.9713/kcer.2011.49.6.810

Synthesis of Low Concentration of NaOH Solution using $Na^+$ ion in the Concentrated Water from Membrane Separation Process  

Lee, Yoon-Ji (Department of Environmental Engineering, Kyungpook National University)
Park, Youn-Jin (Department of Environmental Engineering, Kyungpook National University)
Choi, Jeong-Hak (Environment Research Team, Daegu-Gyeongbuk Development Institute)
Shin, Won-Sik (Department of Environmental Engineering, Kyungpook National University)
Choi, Sang-June (Department of Environmental Engineering, Kyungpook National University)
Chon, Uong (Hybrid Materials Research Department, Research Institute of Industrial Science & Technology)
Publication Information
Korean Chemical Engineering Research / v.49, no.6, 2011 , pp. 810-815 More about this Journal
Abstract
Concentrated water discharged from seawater desalination process contains a high concentration of $Na^+$ ion. Electrolysis was applied to synthesize NaOH solution from the highly concentrated NaCl solution. The effect of various operating parameters of composited laboratory-scale chlor-alkali (CA) membrane cell was investigated. The operating parameters such as membrane types (CIMS and Nafion membranes), pretreatment of the membrane, flow rate (73 mL/min~200 mL/min), initial $Na^+$ ion concentration (1.5 M, 3M and 5 M) and current (1.5A and 2A) were evaluated. It was observed that synthesis efficiency of NaOH solution with CIMS membrane was higher than that with Nafion membrane, but the durability of CIMS membrane on $Cl_2$ gas was poor. The synthesis efficiency of NaOH solution increased with increasing initial $Na^+$ ion concentration and current, while the efficiency decreased with increasing flow rate using Nafion membrane.
Keywords
Brine; Chlor-Alkali Process; Electrolysis; Ion Exchange Membrane; Reverse Osmosis;
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