Reaction Kinetics Of Carbon Dioxide?CO₂? With Diethylenetriamine,1,3-Diaminopropane And 1-Amino-2-Propanol In Non-aqueous Solvents Using Stopped-flow Technique

In recent years,with the rapid development of global economy the demand of fossil fuels for human has increased gradually.That is the reason why the emission of global carbon dioxide?CO₂?caused by energy consumption increased.But the increase of carbon dioxide?CO₂?emissions will bring a series of environmental problems.At present,amine solvent capture technology is the most widely used and promising technology for the reduction of CO₂ emission,so the further optimization and upgrading of CO₂ capture technology is the key to reduce carbon emissions.However,the technology of amine solvent CO₂ capture also has some defects,it is the high energy consumption of desorption.So the current research focus of researchers is to develop new organic amine solvent and improve the process of CO₂ capture technology.This paper focuses on the study of reaction process and kinetics of diethylenetriamine,1,3-diaminopropane and 1-amino-2-propanol with CO₂ in non-aqueous solvent system.The stopped-flow equipment was used to measure the pseudo first-order reaction rate constant of those three amines in 293-313K in ethanol and methanol system,respectively.The concentration of DETA system and DAP system is 10mol/m3?50mol/m3,and the concentration of 1-AP system is 10mol/m3 to 100mol/m3.The value of the pseudo first-order reaction rate constant in the experiment is in direct proportion to the temperature and concentration of amine solution in each system.The kinetic data of DETA and DAP in ethanol and methanol system is fitted by zwitterion mechanism,but the kinetic data of 1-AP system is fitted by the three molecular mechanism.All of the obtained kinetic equation can well predict the kinetic data in each system,and the difference between the predicted and experimental values?AAD?is in the appropriate rangeThis study found that the value of k₂ of DETA and DAP is higher than the value of k₂ of AEEA and EDA in ethanol and methanol system,which indicates that that DETA and DAP has a faster reaction rate than AEEA and EDA under the same conditions in ethanol and methanol system.Because of the rapid reaction rate and low energy consumption in desorption process in non-aqueous system,DETA and DAP in ethanol and methanol system is very helpful for the optimization and designation of CO₂ capture process.In addition,the kinetic data obtained in this research can well complement the kinetic database of amines absorption of CO₂,and provide the necessary reference and comparative basis for subsequent CO₂ capture technology.