甘氨酸-甘氨酸钾体系循环吸收-解吸CO2性能研究

在传统的热再生工艺基础上，提出了一种通过添加一定量的甘氨酸来提高甘氨酸钾再生性能的方法。采用醇析结晶的方法实现了甘氨酸的回收，回收率高达97.24%，且结晶甘氨酸的实验效果与商业甘氨酸无明显差别。甘氨酸钾多次循环吸收-解吸CO₂的性能与新鲜甘氨酸钾溶液基本一致，实验系统运行稳定。同时考察了操作条件对CO₂再生率和解吸能耗的影响，实验结果表明：对比不加酸的空白实验，加入一定量的甘氨酸后CO₂的再生率明显提高，解吸单位摩尔CO₂的能耗显著降低；随着酸量的不断增加，CO₂再生率呈现出先增长后趋于稳定的趋势；在一定范围内提高解吸温度，CO₂再生率增加，解吸单位摩尔CO₂的能耗减小。

CO2 absorption-desorption cycles in the glycine-potassium glycinate system

The conventional method based on the thermal regeneration of potassium glycinate has been improved by adding a certain amount of glycine. The recovery rate of glycine was up to 97.2% using alcohol precipitation. The performance of the regenerated potassium glycinate solution in CO₂ absorption-desorption cycles was essentially identical to that of fresh potassium glycinate solution. The influence of varying the operating conditions on the performance of the regenerated materials was studied experimentally. It was found that the energy consumption decreased after addition of glycine and the regeneration efficiency improved. The regeneration efficiency initially increased and then remained essentially constant when the amount of acid added to the solvent was increased, while other desorption conditions remained unchanged. In addition, the influence of desorption temperature on the regeneration efficiency and energy consumption of the potassium glycinate solution was found to be significant. Our improved process reduces the cost of CO₂ capture and has great potential applications in industry.