氨和二氧化碳的选择性吸收分离 III.二级连串吸收分离的研究  

Selective Absorption Separation of NH_3 and CO_2 Mixture GasIII. Separation Investigation by Two Step Absorbers in Series

作　　者：蔡平雄[1] 张成芳[1] 郑志胜[1] 钦淑均[1] 

机构地区：[1]华东理工大学化工工艺研究所,上海200237

出　　处：《华东理工大学学报（自然科学版）》2002年第6期573-577,共5页Journal of East China University of Science and Technology

摘　　要：用二级连串吸收器对 NH3 与 CO2 摩尔比为 2∶ 1的混合气体进行高气速选择性吸收 ,获得了良好的分离效果 ,二级吸收器出口气相 CO2 摩尔分率达 0 .90 9,残余氨摩尔分率仅为 0 .0 91 ,氨的总吸收率为 96 .7% ,二氧化碳的总吸收率为 3 3 .1 % ,液相氨水浓度可达 1 0 .82 mol/ L,液相氨碳摩尔比为 5 .85。实验发现 ,一级吸收的液相氨浓度、二级吸收器温度和喷孔气速是影响残余氨含量的主要因素 ;A selective absorption has been studied to separate the mixture gas of NH_3/CO_2=2(mol) by the two steps absorbers in series at high gas velocity, satisfactory separation was obtained. The export content of CO_2 for second step absorber has got to 0.909(mol fraction), and remainder ammonia mol fraction is only 0.091.The absorber recovered 96.7% of NH_3 and 33.1% of CO_2. The concentration of NH_3 in liquid phase reached 10.82mol/L, and the mol ratio of NH_3 to CO_2 is 5.85. It is concluded through the experiment that the concentration of NH_3 of first absorber, temperature of second step absorber and the gas velocity of nozzle are the main influence factors on remainder ammonia content. And the main influence factors on the total absorptivity of CO_2 are concentration of NH_3 in outlet solution and gas velocity of nozzle.

关 键 词：氨 二氧化碳 选择性吸收分离 混合气 尿素 尾气 

分 类 号：TQ441.41[化学工程—化学肥料工业] X78[环境科学与工程—环境工程]