低碳化学与化工2026，Vol.51Issue(3)：68-77,10.DOI:10.12434/j.issn.2097-2547.20250175
二甘醇胺CO2富液解吸宏观动力学研究
Study on macroscopic kinetics of desorption of CO2-enriched DGA solution
摘要
Abstract
Alcohol-amine solvents are commonly used as CO2 chemical absorbents in industrial fields.The CO2 desorption kinetics of alcohol-amine rich solution is an important index for evaluating alcohol-amine absorbents.Studying the CO2 desorption kinetics of alcohol-amine rich solution and establishing corresponding kinetic models are of significant importance for guiding the development and optimization of alcohol-amine absorbents.Using 5 mol/L diethylene glycolamine(DGA)solution enriched with CO2("DGA rich solution"for short)as the target,and a continuous stirred reactor was used to determine their CO2 desorption rate.The rotating Reynolds number(Rer)and desorption temperature in the reactor were selected as the state parameters to measure the turbulence intensity and temperature in desorption process,respectively,and the kinetic equation for CO2 desorption of DGA rich solution was fitted.The results indicate that compared to Rer=0 in reactor,increasing the turbulence intensity(Rer=20000)can reduce the heat of macroscopic desorption reaction of DGA rich solution by 6.21%and reduce the apparent activation energy by 2.65%.In the intermittent desorption experiments,increasing the turbulence intensity can reduce the CO2 equilibrium loading of DGA rich solution by 3.82%to 9.16%(rotational speed of 200 r/min as the reference),and increasing the desorption temperature from 353 K to 372 K can reduce the CO2 equilibrium loading of DGA rich solution by 34.93%to 39.64%.In the continuous desorption experiments,increasing the turbulence intensity can increase the CO2 steady-state desorption rate from 6.46%to 79.63%(rotational speed of 200 r/min as the reference),and increasing the solution desorption temperature from 347 K to 376 K can increase the CO2 steady-state desorption rate by about 17-fold.The CO2 desorption kinetics model of DGA rich solution in the desorption temperature range of 347 K to 376 K,Rer of 846 to 7789 and CO2 loading of 1.35 mol/L to 2.68 mol/L is r=1.53×1014×exp(-2.30×105-1.53×10-5×Re2r/2RTdes)×[CDGA-CO2-C*CO2×C*DGA 2/6.34×1024×exp(-1.74×105-2.70×10-5×Re2r/RTdes)]1.20.Among them,r is the CO2 desorption rate,R is the ideal gas constant,Tdes is the desorption temperature,CDGA-CO2 is the CO2 loading in DGA rich solution,C*CO2 is the CO2 equilibrium concentration in rich DGA solution,C*DGA is the concentration of DGA at desorption equilibrium.关键词
CO2解吸动力学/湍动强度/CO2解吸速率/DGA富液/表观活化能Key words
CO2 desorption kinetics/turbulence intensity/CO2 desorption rate/DGA rich solution/apparent activation energy分类
化学化工引用本文复制引用
曾惜,唐思扬,钟山,李红娇,鲁峰,梁斌..二甘醇胺CO2富液解吸宏观动力学研究[J].低碳化学与化工,2026,51(3):68-77,10.基金项目
四川省先进建筑材料产教融合创新示范平台(川材教[2022]106号). （川材教[2022]106号）
