硫碘制氢中碘量对Bunsen反应影响的实验研究

为了进一步了解Bunsen反应的两相分层特性,在291、305 K的反应温度下,通过自制的Bunsen反应容器配置H2SO4、HI、I2、H2O混合溶液,研究碘量（I2）对溶液分层以及净化的影响.计算结果表明：从溶液分层到溶液饱和所需的I2增加1.3～1.9倍,并且随着I2的增加,下层溶液（HI相）密度明显增大,上层溶液（H2SO4相）密度小幅度地减小,上层溶液的H2SO4浓度均匀增加,下层溶液的HI浓度略微减少,上、下层溶液的杂质浓度同时急剧降低.可见,I2的加入有利于混合溶液的分层以及净化,也有利于硫碘制氢系统的流程优化和效率提高.

Experimental study of influence of iodine content on Bunsen reaction in the sulfur-iodine cycle for hydrogen production

The effects of iodine content on the separation and purification of liquid-liquid phase, in H2SO4-HI-I2-H2O mixture solution of Bunsen reactor, were investigated to familiarize the separation characteristics in the operating temperature of 291 and 305 K. Calculation results showed that iodine content at the point where iodine saturated was 2.3～2.9 times as large as the one at the point that the mixture solution started to separate. The density of heavier phase (hydriodic acid phase) drastically increased by increasing iodine content, while the one of lighter phase (sulfuric acid phase) slightly decreased. Sulfuric acid concentration of lighter phase evenly enhanced as iodine content increased, while hydriodic acid concentration of heavier phase slightly reduced and impurities of both phases drastically decreased. In conclusion, increasing iodine content favored liquid-liquid phase separation and purification, and then reached system optimization and thermal efficiency enhancement of the sulfur-iodine hydrogen production process.