Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolam...Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolamine(MEA)-sulfolane-water is inexpensive and has a fast absorption rate.It is one of the most promising solvents for large-scale industrial applications.Therefore,this study investigates the mass transfer performance of this phase change system in the process of CO_(2)absorption in a packed tower.By comparing the phase change absorbent and the ordinary absorbent,it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration.In the 4 mol·L^(-1)MEA/5 mol·L^(-1)sulfolane system,the CO_(2)loading of the upper liquid phase after phase separation is almost zero,while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent,which greatly reduces the energy consumption.This study also investigates the influence of operating parameters such as lean CO_(2)loading,gas and liquid flow rates,CO_(2)partial pressure,and temperature on the volumetric mass transfer coefficient(K_(G)α_(V)).The research shows that K_(G)α_(V) increases with increasing liquid flow rate and decreases with the increase of lean CO_(2)loading and CO_(2)partial pressure,while the inert gas flow rate and temperature have little effect on K_(G)α_(V).In addition,based on the principle of phase change absorption,a predictive equation for the K_(G)α_(V) of MEA-sulfolane in the packed tower was established.The K_(G)α_(V) obtained from the experiment is consistent with the model prediction,and the absolute average deviation(AAD)is 7.8%.展开更多
In this work,the performance of CO2 absorption into aqueous 2-amino-2-methyl-propanol(AMP)solution was investigated by measuring the amount of CO2 in the liquid phase during CO2 absorption process to identify initial ...In this work,the performance of CO2 absorption into aqueous 2-amino-2-methyl-propanol(AMP)solution was investigated by measuring the amount of CO2 in the liquid phase during CO2 absorption process to identify initial CO2 absorption rate.Then,the porous media material named as MCM41 was introduced into the amine solution to test its influence on CO2 absorption.It was found that MCM41 increased initial CO2 absorption rate and enhanced CO2 absorption process.The physico-chemical properties of MCM41 were characterized in terms of specific surface area,average pore diameter,total pore volume and chemical properties,the amount of acidic sites and the Brfnsted/Lewis(B/L)acid sites ratio.Results showed that MCM41 was a type of Lewis acid catalyst with large specific surface area and pore volume.In addition,the pKa of AMP solution with and without MCM41 was obtained using acid titration technology to help understand the effect brought by MCM41.A mechanism illustrating how MCM41 increases the CO2 absorption rate of the AMP solution was proposed and demonstrated that MCM41 is a potential material for enhancing CO2 absorption.展开更多
基金The National Natural Science Foundation of China(NSFC-Nos.22138002,22078083,and 21978075)the Hunan Key R&D Program Project(2020NK2015)+2 种基金National Key R&D Projects in Changsha(kh2005018)National Key Research&Development Program-Intergovernmental International Science and Technology Innovation Cooperation Project(2021YFE0112800)the science and technology innovation Program of Hunan Province(2020RC5032)。
文摘Phase change absorbents for CO_(2)are of great interest because they are expected to greatly reduce the heat energy consumption during the regeneration process.Compared with other phase change absorbents,monoethanolamine(MEA)-sulfolane-water is inexpensive and has a fast absorption rate.It is one of the most promising solvents for large-scale industrial applications.Therefore,this study investigates the mass transfer performance of this phase change system in the process of CO_(2)absorption in a packed tower.By comparing the phase change absorbent and the ordinary absorbent,it is concluded that the use of MEA/sulfolane phase change absorbent has significantly improved mass transfer efficiency compared to a single MEA absorbent at the same concentration.In the 4 mol·L^(-1)MEA/5 mol·L^(-1)sulfolane system,the CO_(2)loading of the upper liquid phase after phase separation is almost zero,while the volume of the lower liquid phase sent to the desorption operation is about half of the total volume of the absorbent,which greatly reduces the energy consumption.This study also investigates the influence of operating parameters such as lean CO_(2)loading,gas and liquid flow rates,CO_(2)partial pressure,and temperature on the volumetric mass transfer coefficient(K_(G)α_(V)).The research shows that K_(G)α_(V) increases with increasing liquid flow rate and decreases with the increase of lean CO_(2)loading and CO_(2)partial pressure,while the inert gas flow rate and temperature have little effect on K_(G)α_(V).In addition,based on the principle of phase change absorption,a predictive equation for the K_(G)α_(V) of MEA-sulfolane in the packed tower was established.The K_(G)α_(V) obtained from the experiment is consistent with the model prediction,and the absolute average deviation(AAD)is 7.8%.
基金The financial supports from the National Natural Science Foundation of China(NSFC-Nos.21536003,21476064,U1362112,21376067 and 51521006)National Key Technology R&D Program(MOST-No.2014BAC18B04)+5 种基金Innovative Research Team Development Plan(MOE-No.IRT1238)Specialized Research Fund for the Doctoral Program of Higher Education(MOE-No.20130161110025)Key Project of International&Regional Cooperation of Hunan Provincial Science and Technology plan(2014WK2037)China Outstanding Engineer Training Plan for Students of Chemical Engineering&Technology in Hunan University(MOE-No.2011-40)Opening project of Guangxi CollegesUniversities Key Laboratory of Beibu Gulf Oil and Natural Gas Resource Effective Utilization(2016KLOG11)are gratefully acknowledged.
文摘In this work,the performance of CO2 absorption into aqueous 2-amino-2-methyl-propanol(AMP)solution was investigated by measuring the amount of CO2 in the liquid phase during CO2 absorption process to identify initial CO2 absorption rate.Then,the porous media material named as MCM41 was introduced into the amine solution to test its influence on CO2 absorption.It was found that MCM41 increased initial CO2 absorption rate and enhanced CO2 absorption process.The physico-chemical properties of MCM41 were characterized in terms of specific surface area,average pore diameter,total pore volume and chemical properties,the amount of acidic sites and the Brfnsted/Lewis(B/L)acid sites ratio.Results showed that MCM41 was a type of Lewis acid catalyst with large specific surface area and pore volume.In addition,the pKa of AMP solution with and without MCM41 was obtained using acid titration technology to help understand the effect brought by MCM41.A mechanism illustrating how MCM41 increases the CO2 absorption rate of the AMP solution was proposed and demonstrated that MCM41 is a potential material for enhancing CO2 absorption.
