碳酸二甲酯中微量水有效脱除研究

Study on Removal of Trace Water From Dimethyl Carbonate

本研究应用不同尺寸的4A分子筛对碳酸二甲酯中的微量水分进行充分吸收,同时应用卡尔费休方法对待测碳酸二甲酯中的微量水分进行精准测定。在研究过程中,应用高效的活化方法对4A分子筛的吸附效能进行充分的激活,并控制不同的除水时间,通过分子筛对碳酸二甲酯中的水分充分吸收,在4个小时的除水过程中,碳酸二甲酯中水分含量从40 mg/L有效降低到3 mg/L,保证了碳酸二甲酯作为电解液溶剂的应用。同时本研究对4A分子筛的除水原理,卡尔费休库伦法测定水分含量的电化学过程,以及不同尺寸4A分子筛的除水效能机理进行充分的分析,对锂离子电池电解液的配制以及电解液溶剂的除水具有重要的指导意义。

4A molecular sieves of different sizes were used to fully absorb the trace moisture in dimethyl carbonate,and the Karl Fischer method was used to accurately determine the trace moisture in the dimethyl carbonate to be measured.In the research process,the adsorption efficiency of 4A molecular sieve was fully activated by using an efficient activation method,different water removal time was controlled,the moisture content in dimethyl carbonate was fully absorbed through molecular sieve.In the 4 hour water removal process,the water content in dimethyl carbonate is effectively reduced from 40 mg/L to 3 mg/L,which ensures the application of dimethyl carbonate as electrolyte solvent.At the same time,this study fully analyzes the water removal principle of 4A molecular sieves,the electrochemical process of the Karl Fischer Coulomb method for the determination of moisture content,and the water removal efficiency mechanism of 4A molecular sieves of different sizes,which has important guiding significance for the preparation of lithium ion battery electrolyte and the water removal of electrolyte solvent.