测试了氨水吸收CO2反应过程中CO2的脱除率和反应溶液pH值随吸收时间的变化,选择氨水质量分数分别为5％,10％,气体流速为540 mL/min,CO2体积分数为13.7％,研究了氨水溶液对CO2脱除率,结果表明:质量分数为10％的氨水溶液在反应初期对CO2脱除率能达到90％,随反应时间的延长,脱除率有所下降.对反应产物进行冷凝、结晶、干燥后的XRD分析结果显示氨水吸收CO2的产物主要为NH4HCO3.对氨水吸收CO2的反应产物进行了热质量损失实验,结果表明:在455 K时NH4 HCO3可以达到100％分解,且升温速率为10 K/min时,最大分解速度对应的温度为416 K.
CO2 absorption in aqueous ammonia and thermal decomposition of solid products
The CO2 removal efficiency and changes of pH value in solution with the operation time were tested. The CO2 removal efficiency was observed under the following experimental conditions: aqueous ammonia mass fraction of 5% and 10% , gas flow rate of 540 mL/min, CO2 volume fraction of 13. 7%. The result shows that for the aqueous ammonia with mass fraction 10% , the CO2 removal efficiency can reach 90% at first and then decreases slowly as the reaction is proceeding. The reaction products were analyzed and determined by X-ray diffraction ( XRD) analysis after condensation, crystallization, and drying. The measurement results indicate that NH4HCO3 is the major product of the reaction. The solid products after crystallization were analyzed by TGA. The result shows that the decomposition rate is about 100% at 455 K. The temperature for maximum decomposition rate is 416 K when the heating rate is 10 K/min.
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