铬酸钠一步电合成三氧化铬槽电压变化规律及宏观动力学研究

Study on the variation of cell voltage and macrokinetics for one-step electrosynthesis of chromium trioxide by sodium chromate

针对三氧化铬传统生产工艺存在高消耗、高污染等诸多弊端,研究了其电催化绿色合成新技术。在以自制新型复极式电解槽为核心的反应装置中,采用铬酸钠为原料的一步电合成工艺,进行三氧化铬合成反应实验。测得槽电压和阳极液钠铬比动力学数据,表明槽电压变化规律可用来监控和表征电合成反应进程,反应为拟一级反应动力学。建立了槽电压变化和反应宏观动力学数学模型,详细探讨了槽电压的影响因素及其变化规律。

A new green electrosynthesis technology of chromium trioxide was studied in view of its disadvantages of the traditional production process,such as high consumption,high pollution and so on.In a reaction device with a new type of repolarization electrolyzer as the core,a one-step electrosynthesis process using sodium chromate as raw material was carried out for the synthesis of chromium trioxide.The kinetic data of sodium-chromium ratio in anolyte and the cell voltages at different reaction time were measured.The results showed that the variation of cell voltage could be used to monitor and characterize the process of electrosynthesis reaction,and the reaction was pseudo-first order.The mathematical models of cell voltage variation and macrokinetics were established,and the influencing factors of cell voltage and its variation law were discussed in detail.