有机胺溶液吸收CO_2及其再生性能研究

Experimental research on CO_2 absorption and regeneration of some amine solutions

为提高胺法吸收CO2的效率,减少过程中的胺损失,利用直接接触法和中空纤维膜接触器,考察了几种典型的单一有机胺溶液对不同浓度CO2的吸收特性及再生性能。试验结果表明,α碳-甲基取代胺能提高溶液的吸收容量,但总吸收速率下降;在低CO2浓度下,α碳-二甲基取代胺吸收速率较低且易析出;采用氨基乙酸钾(PG)和N-甲基甘氨酸钾(PMG)溶液,在膜吸收系统上可获得很高的CO2脱除效率,显示出良好的发展潜力。

In order to improve the efficiency of the carbon dioxide cycling process and to reduce amine emissions,a series of typical single amines were investigated with a simple stirred-cell absorber and a hollow fiber membrane module.Absorption from atmospheres containing various levels of CO2 was measured to assess the total capacities and absorption rates of amine solutions.The regeneration rates and extent of CO2 desorption were established by heating these solutions.Methyl groups substituted adjacent to the amine were found to increase solution absorption capacities but with an overall reduction in absorption rate.Poor absorption rates at low CO2 levels and precipitation problems would prevent the α-dimethylamines examined from being used in existing submarine scrubbers.Potassium glycinate（PG）and N-methyl-glycinate potassium（PMG）had high efficiency in membrane gas absorption processes and showed potential.