四甲基氢氧化铵的提纯实验研究

Purification Experiment of Tetramethyl Ammonium Hydroxide

通过单因素实验考察了四甲基氢氧化铵的电解工艺。以钛基镀铱板为阳极,不锈钢为阴极,在电解槽中恒电流密度电解提纯四甲基氢氧化铵,主要考察了电解工艺中离子交换膜种类、原料浓度、电解温度和电流密度对电流效率的影响。当采用上海上化水处理厂3361为阳离子交换膜,在原料室四甲基氢氧化铵浓度25%、电解液温度50℃、电流密度8 ASD(A/dm2)时,电流效率可达66.74%,产品中金属离子杂质总含量从25×10-6降至0.8×10-6,氯离子浓度从0.65×10-6降至0.01×10-6。采用等离子体发射光谱仪(ICP-AES)、分光光度计对产品四甲基氢氧化铵进行表征。

The electrolysis process of tetramethyl ammonium hydroxide （TMAH） was investigated by single factor experiment .Using Ti-based iridium-plated plate as anode and stainless steel as cathode, tetramethyl ammonium hydroxide was purified by electrolysis under constant current density in electric tank. Effect of ion exchange membrane type, raw material concentration, electrolysis temperature and current density on current efficiency in the electrolysis process was investigated. The results show that, under the optimal operating condition of 3361 cation exchange membrane from Shanghai Shanghua water treatment material company, 25% tetramethyl ammonium hydroxide, 50 ℃ and 8ASD（A/dm2） current density, the current efficiency is up to 66.74% , and the concentration of metal ions is reduced from 25 ppm to 0.8 ppm, and the concentration of chloride ion is reduced from 0.6ppm to 0.01 ppm in purified TMAH. At last, the product of TMAH was qualitatively identified by the way of inductively coupled plasma atomic emission spectrometry and spectrophotometer.