TETA对CO_2的吸收及其动力学参数的推导

为了提高CO2的吸收量,选用含四个氮原子的三乙烯四胺(简写为TETA)为吸收剂,在常压下,采用搅拌式反应器对TETA吸收CO2进行了研究。得到TETA吸收CO2的最佳温度为308K、最佳浓度为1.0mol/L,并与常用的醇胺吸收剂一乙醇胺(简写为MEA)、二乙醇胺(简写为DEA)、三乙醇胺(简写为TEA)的吸收效果进行比较,实验结果显示:TETA是一种性能优良的CO2吸收剂。同时分析了各吸收剂对二氧化碳的吸收机理;应用化学动力学理论计算了不同温度下TETA吸收CO2反应的级数,速率常数及反应的平均活化能。计算结果表明,在最佳温度308K时,反应的速率常数最大,反应速率最快,反应级数n=1.6,速率常数k′=0.172,平均活化能Ea=132kJ/mol。

Absorption of CO2 by TETA and Its Derivation of Kinetic Parameters

In this paper,in order to improve the absorption of CO2,the three ethylene tetramine（TETA） with four nitrogen atoms is used as the absorbent.At atmospheric pressure,the reactor with agitator were adopted to study absorption of CO2 by TETA.The optimum conditions were obtained as temperature of 308K and concentration of 1.0mol/L,which were compared with that using traditional absorbents such as ethanolamine（MEA）,diethanolamine（DEA） and triethanolamine（TEA）.The experimental results show that TETA is an excellent absorbent of CO2.The mechanism of the absorbent is analyzed.In addition,chemical kinetics were applied to calculate the reaction order,speed constant and activation energy of TETA absorbing CO2 at different temperature.The calculation results show that at the optimum temperature of 308K,the reaction speed constant reaches the maximum and the reaction gets the highest speed with reaction order of n=1.6 and speed constant of k′=0.172,The average activation energy Ea=132kJ/mol.