脱硫脱硝吸收液中硫酸铵电化学制备过硫酸铵的实验研究

Experimental study on electrosynthesis of ammonium persulfate using ammonium sulfate solutions from wet simultaneous desulfurization and denitrification

尿素/氨混合溶液同时脱硫脱硝的循环吸收液中硫酸铵的含量达到82%,为了实现尿素/氨混合溶液同时脱硫脱硝的循环吸收液高效、高附加值的资源化回收,对硫酸铵电解过程中工艺参数的影响特性进行了实验研究.实验在自制的电解装置中进行,阴极采用钛板材料作电极,分别采用静态和动态方法,对硫酸铵电解过程中工艺参数如槽电压、反应物浓度、添加剂、反应时间等进行了考察.实验结果表明,在最优工况下最佳电流效率达到88.91%.较国内电解硫酸铵制备过硫酸铵的常见电流效率提高超过3%,验证了钛板为阴极在电解硫酸铵制备过硫酸铵中的可行性.同时通过对比发现,聚磷酸铵作为阳极添加剂具有可行性.

The content of ammonium sulfate in recycling absorbent solutions from the wet simultane- ous desulfurization and denitrification using urea/ammonia solution reaches above 82%. In order to realize the efficient and higher value-added resource recycling utilization for the above absorbent so- lution, the effects of operating parameters, such as the electrobath voltage, the concentration of re- actant, catalysts, electrolytic time, on the process for electrosynthesis of ammonium persulfate were investigated by experiments. The experiments were carried out in a homemade electrolytic experi- ment device with the titanium plate as the cathode using both static and dynamic methods. The ex- perimental results indicate that the current efficiency reaches 88.91% under the optimal operating conditions. Therefore, the current efficiency is increased by more than 3 % compared with that of the domestic existing process for electrosynthesis of ammonium persulfate. It confirms that the titanium plate as the cathode in electrosynthesis of ammonium persulfate is feasible. Meanwhile, it is also found that ammonium polyphosphate as additive is effective.