In this paper, by means of thermo-gravimetric analysis(TGA), the desorption kinetics of CO₂ absorbed in two kinds of rich amine solutions, MDEA (3.25mol/L) and MDEA+DEA(3.25mol/L-0.3mol/L), were investigated under different heating rates(2.5℃/min, 5℃/min, 10℃/min and 20℃/min). The thermal analysis kinetics was applied to analyze the TG-DTG curves of two rich amine solutions so as to research CO₂ desorption kinetics. In addition, the CO₂ desorption kinetics parameters have been calculated with model-free method Flynn-Wall-Ozawa (FWO) and model-fitting method Coats-Redfern (CR). The results indicated that CO₂ desorption process could be divided into two stages. The CO₂ and H₂O were released with non-uniform speed in the first stage and MDEA or DEA with higher boiling points were evaporated in the second stage. For MDEA solution the average activation energy E was 50.36kJ/mol, the pre-exponential factor A was 1.68×10⁷, and the most probable integral mechanism function was $G\left(\alpha \right)={\alpha }^{3/2}$. For MDEA+DEA solution the average activation energy E was 59.68kJ/mol, the pre-exponential factor A was 2.22×10⁷, and the most probable integral mechanism function was $G\left(\alpha \right)={[{(1+\alpha )}^{1/3}-1]}^2$. The technical feasibility of CO₂ desorption performance in rich amine solutions with thermo-gravimetric analysis method was demonstrated.

本文通过热重分析（TGA），研究了MDEA（3.25mol / L）和MDEA + DEA（3.25mol / L-0.3mol / m）两种富胺溶液中CO ₂的解吸动力学。L），在不同的加热速率（2.5℃/ min，5℃/ min，10℃/ min和20℃/ min）下进行研究。利用热分析动力学分析了两种富胺溶液的TG-DTG曲线，以研究CO _2的解吸动力学。另外，已经用无模型方法Flynn-Wall-Ozawa（FWO）和模型拟合方法Coats-Redfern（CR）计算了CO ₂解吸动力学参数。结果表明，CO ₂解吸过程可分为两个阶段。CO ₂和H ₂O在第一阶段以不均匀的速度释放，第二阶段蒸发具有较高沸点的MDEA或DEA。对于MDEA溶液，平均活化能E为50.36kJ / mol，指数前因子A为1.68×10 ⁷，最可能的积分机制为$G\left(\alpha \right)={\alpha }^{3/2}$。对于MDEA + DEA溶液，平均活化能E为59.68kJ / mol，指数前因子A为2.22×10 ⁷，最可能的积分机制为$G\left(\alpha \right)={[{（\mathrm{1个}+\alpha ）}^{\mathrm{1个}/3}-\mathrm{1个}]}^2$。通过热重分析法证明了在富胺溶液中CO ₂解吸性能的技术可行性。