化学氧化法制备季铵盐离子液体

Synthesis of Quaternary Ammonium Ionic Liquids Through Chemical Oxidation Reaction

首次以离子液体溴盐中间体和质子酸为原料、以双氧水为氧化剂、以二氯化碳为除溴剂、通过化学氧化反应合成8种季铵类离子液体.用核磁光谱对产物结构进行表征,用离子色谱、pH计和卡尔费休水份滴定仪分别测量产品中的溴杂质、残留酸和水的含量,用能斯特方程计算无法准确测量的溴离子的浓度.将化学氧化法和离子交换法的结果进行对比,结果表明与传统的离子交换法相比,化学氧化法具有反应时间短和产品收率高的优点.

Eight kinds of quaternary ammonium ionic liquids were synthesized for the first time by usingionic liquid bromide salts intermediates and proton acids through chemical oxidatiand CH2Cl2- The ionic liquids were characterized by using rH NMR and 13C NMR. The content of water, residual bromine and acid in the ILs were measured by Karl Fischer water titration, ion chromatographyand pH meter, respectively. The content of residual bromine was calculated by Nernst equation. Comparing to the traditional ion exchange method, the advantages of the chemical reaction time and higher yields.