The Study Of Density,Viscosity And Physical Solubility Of CO₂ In MAE Solution

Since the industrial revolution,the world economy has developed quickly,and the burning of fossil fuels lead to a sharp increasing of the CO2 emissions.Large amounts of CO2 emission lead to the greenhouse effect.So how to reduce greenhouse gas emissions becomes the most popular topic.At present,based on organic amine chemical,solvent absorption method is the most widely used in industry,as well as one of the most promising CO2 capture technology.The physical parameters of organic amine,including density,viscosity and physical solubility,are indispensable parameters when establish the corresponding absorption kinetics model,thermodynamic model and the process simulation and optimization.Based on the present situation of CO2 capturing by amine method,this paper selects a new type of organic amine MAE as the research object.In this work,the density and viscosity of MAE solution were measured at the temperature ranging 293.15 K to 293.15 K,CO2 loading of 0-0.677 mole CO2/mole amine,and MAE mass fraction of 0.075,0.15,0.225 and 0.30.Redlich-Kister equation,revised Redlich-Kister equation and Weiland equation were used to correlate the density data in different temperature,different concentration and CO2 loading.The average absolute relative deviations are 0.666%,0.231%and 0.666%respectively.It can be concluded that the revised Redlich-Kister equation is the most suitable model for the density of MAE system.At the same time,Redlich-Kister equation,Weiland equation and the modified Grunberg-Nissan equation were used to correlate the viscosity data of MAE solution in different temperature,different concentration and CO2 loading,with the average absolute relative deviations are 2.596%,1.922%and 8.628%respectively.It can be concluded that Weiland equation is the most suitable model for MAE viscosity.In the process of CO2 capture by organic amine,the solubility of CO2 in liquid phase is a key parameter of gas-liquid-equilibrium calculation,as well as an important parameter in industrial application.A universal solubility model can effectively and accurately calculate the gas-liquid balance parameters of the system.In this work,N2O analogy method would be used to calculate the CO2 physical solubility in MAE aqueous solution by setting up a temperature controlled stirred cell reactor as experimental equipment.The physical solubility of N2O in MAE aqueous solution is measured in the temperature range of 289.31K to 348.18K,and the mass fraction of MAE range of 0.075,0.15,0.225,0.30,0.45,0.60,0.75,1.Then the Henry's constants was fitted by using the empirical model,a semi-empirical model and Redlich-Kister equation respectively,and the average absolute relative deviations are 4.53%,6.41%and 5.06%respectively.Empirical model can accurately predict physical solubility of CO2 in MAE aqueous solution,which is of great significance in calculation accuracy of the process of kinetics and thermodynamics for CO2 absorption by MAE aqueous solution,and ultimately the process simulation and optimization.