CO2在混合胺MEA+DETA溶液中的溶解度

摘要

The relations of CO2 absorption capacity with the system temperature,pressure and absorbent concentration were studied respectively when the CO2-absorbent system achieved the gas-liquid dynamic equilibrium,under the condition of 298-338 K,300-700 kPa and 1-3 mol/L.Based on Henry's law,a model of CO2 solubility in single amine solution was established with citing a factor related with temperature and pressure.The model predicts the solubility of CO2 in MEA and DETA single amine solution well,with the error below 1％.The CO2 solubility in MEA and DETA single amine solution was multiplied by the mole fraction of MEA and DETA in the MEA + DETA blended amine solutions respectively and stacked,with citing an enhancement factor (β =1.06),the model of CO2 solubility in MEA + DETA blended amine solution was built.The model predicts the solubility of CO2 in MEA + DETA blended amine solution well,with the error of 1％-10％.%在温度298-338 K,压力300-700 kPa,吸收剂浓度1-3 mol/L的实验条件范围内,讨论了CO2-吸收剂体系气液二相基本达到平衡时,CO2吸收量与体系温度,压力及吸收剂浓度的关系.根据亨利定律,引入温度及压力相关因子,建立了CO2在单胺溶液中的溶解度模型.模型对CO2在MEA、DETA单胺溶液中的溶解度预测效果较好,与实验值比较,误差在1％以下.引入增强因子β=l.06,并以单胺在混合胺溶液中的摩尔分数为系数,将CO2在单胺溶液中的溶解度叠加获得CO2在MEA+ DETA混合溶液中的溶解度模型.模型对MEA+ DETA混合胺的预测误差在1％-10％.