Using bipolar membrane electrodialysis to synthesize di-quaternary ammonium hydroxide and optimization design by response surface methodology

doi:10.1016/j.cjche.2017.03.025

摘要/Abstract

摘要： Bipolar membrane electrodialysis (BMED) has already been described for the preparation of quaternary ammonium hydroxide. However, compared to quaternary ammonium hydroxide, di-quaternary ammonium hydroxide has raised great interest due to its high thermal stability and good oriented performance. In order to synthesize N,N-hexamethylenebis(trimethyl ammonium hydroxide) (HM(OH)₂) by EDBM, experiments designed by response surface methodology were carried out on the basis of single-factor experiments. The factors include current density, feed concentration and flow ratio of each compartment (feed compartment:base compartment:acid compartment:buffer compartment). The relationship between current efficiency and the above-mentioned three factors was quantitatively described by a multivariate regression model. According to the results, the feed concentration was the most significant factor and the optimum conditions were as follows:the current efficiency was up to 76.2% (the hydroxide conversion was over 98.6%), with a current density of 13.15 mA·cm^-2, a feed concentration of 0.27 mol·L^-1 and a flow ratio of 20 L·h^-1:26 L·h^-1:20 L·h^-1:20 L·h^-1 for feed compartment, base compartment, acid compartment, and intermediate compartment, respectively. This study demonstrates the optimized parameters of manufacturing HM(OH)₂ by direct splitting its halide for industrial application.

关键词: Di-quaternary ammonium hydroxide, Bipolar membrane electrodialysis, Response surface methodology, N,N-hexamethylenebis(trimethyl ammonium, hydroxide)

Abstract: Bipolar membrane electrodialysis (BMED) has already been described for the preparation of quaternary ammonium hydroxide. However, compared to quaternary ammonium hydroxide, di-quaternary ammonium hydroxide has raised great interest due to its high thermal stability and good oriented performance. In order to synthesize N,N-hexamethylenebis(trimethyl ammonium hydroxide) (HM(OH)₂) by EDBM, experiments designed by response surface methodology were carried out on the basis of single-factor experiments. The factors include current density, feed concentration and flow ratio of each compartment (feed compartment:base compartment:acid compartment:buffer compartment). The relationship between current efficiency and the above-mentioned three factors was quantitatively described by a multivariate regression model. According to the results, the feed concentration was the most significant factor and the optimum conditions were as follows:the current efficiency was up to 76.2% (the hydroxide conversion was over 98.6%), with a current density of 13.15 mA·cm^-2, a feed concentration of 0.27 mol·L^-1 and a flow ratio of 20 L·h^-1:26 L·h^-1:20 L·h^-1:20 L·h^-1 for feed compartment, base compartment, acid compartment, and intermediate compartment, respectively. This study demonstrates the optimized parameters of manufacturing HM(OH)₂ by direct splitting its halide for industrial application.

Key words: Di-quaternary ammonium hydroxide, Bipolar membrane electrodialysis, Response surface methodology, N,N-hexamethylenebis(trimethyl ammonium, hydroxide)

Jiangnan Shen, Zhendong Hou, Congjie Gao. Using bipolar membrane electrodialysis to synthesize di-quaternary ammonium hydroxide and optimization design by response surface methodology[J]. , 2017, 25(9): 1176-1181.

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