MDEA+2,3-丁二酮水溶液对CO_2吸收速率的测定

Absorption Rate Measurement of CO_2 in MDEA+2,3-Butanedione Aqueous Solution

采用恒定容积法测定了不同条件下混合溶剂(w(MDEA)48 5%+w(2,3 丁二酮)5%+水)吸收CO2的吸收速率。结果表明,在相同条件下,较高温度下的吸收速率较高;随着溶剂中CO2平衡浓度的增加,表观吸收速率常数降低;相同条件下,本文使用的混合溶剂吸收CO2的速率高于其他两种混合溶剂(w(MDEA)48 5%+水;w(MDEA)48 5%+w(环丁砜)5 0%+水)。

An equipment for the measurement of kinetic data of gas absorption was improved and the data of absorption rate of CO_2 at different conditions in the system of N-methyldiethanolamine (MDEA)+2,3-butanedione+water were measured. The results indicate that the apparent absorption rate constant increases with the increasing of temperature and decreases with the increasing of the concentration of carbon dioxide dissolved in liquid phase. The results also show that the apparent absorption rates in the system of 48.5wt% MDEA+5.0wt% 2,3-butanedione+water are higher than those of other two systems (48.5wt% MDEA+water, 48.5wt% MDEA+5.0wt% sulfolane+water) at the same conditions.