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Clean preparation of acid and base by NaCl splitting using bipolar membrane electrodialysis

Authors： GAO Yanrong1, WANG Jianyou1*,LIU Hongbin2

Units： 1 College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China

KeyWords： bipolar membrane; electrodialysis; sodium hydroxide; hydrochloric acid

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2014,34(3):96-103

Abstract：

A bipolar membrane electrodialysis (BMED) stack with three compartments was adopted to directly produce sodium hydroxide and hydrochloric acid by sodium chloride splitting. Effects of current density, feed concentration and electrode compartment concentration on the BMED performances were well investigated. Also the influences of two different kinds of cation-exchange membranes were compared with each other. The results exhibited that with current density of 30 mA?cm-2 and 1.5 mol?L-1 NaCl solution, the conversion rate of NaOH could achieve 80.19 % in 220 min. The conversion rate and energy consumption increased as the current density increased. At the constant current density, the resistance of the stack reduced as NaCl concentration increased, and the energy consumption reduced accordingly. The concentration of electrode compartment with low concentration (1 %～2 %) was better than high concentration (3 %～4 %) in this condition. Furthermore, 10 % NaCl was supplied to the feed compartment continually, the concentration of product NaOH can reach 10 %, which was 2.5 times compared with the one-time addition of NaCl.

Funds：

天津市科技兴海专项资金(KJXH2011-007)及海洋公益性行业科研专项经费项目(201405008)资助;

AuthorIntro：

高艳荣(1988-)，女，硕士研究生，E-mail: gaoyanronghao@126.com

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