双极膜电渗析法制备高纯度四甲基氢氧化铵

Preparation of High Purity Tetramethyl Ammonium Hydroxide by Electrodialysis with Bipolar Membrane

为解决传统上采用电解法制备四甲基氢氧化铵(TMAH)存在着高能耗、设备腐蚀及纯度低等问题,而采用绿色环保、低能耗的双极膜电渗析装置处理四甲基碳酸氢铵(TMAHC)溶液制备四甲基氢氧化铵,以避免卤素离子对产品碱纯度的影响。采用双极膜电渗析装置进行实验,在单因素实验的基础上,设计正交实验,考察电流密度、料液TMAHC含量等对实验的影响,并进行极差分析、方差分析以及层次分析。结果表明,对电流效率的影响程度:料液TMAHC含量>电流密度>流量比,当料液TMAHC浓度为1.5 mol/L、电流密度为140 A/m^2、流量体积比为1:2时,电流效率可达到80.3%,收率为96.8%。

In order to solve some problems like high energy consumption, low purity, equipment corrosion, etc of the preparation of TMAH by traditional adopting electrolytic methods. However, electrodialysis with bipolar membrane （BMED） was adopted to produce TMAH from the tetramethyl ammonium bicarbonate （TMAHC） solution, which has low energy consumption and environmental friendly. This method could avoid the effect of halogen ions on the purity of alkali. In BMED experiments, orthogonal experiment was designed on the basis of the single-factors experiments, and the effect of the current density, TMAHC feed concentration and flow ratio on process performance was studied. The results of range analysis, variance analysis and hierarchical analysis showed that the influence degree of various factors on the current efficiency from high to low was： TMAHC feed content, current density, flow ratio. The current efficiency and the TMAH yield were 80.3% and 96.8% respectively when feed concentration of TMAHC, the current density and the volume flow ratio were 1.5 mol/L, 140 A/m2 and 1：2 respectively.