Characterization and Correlations of CO₂ Absorption Performance into Aqueous Amine Blended Solution of Monoethanolamine (MEA) and N,N-Dimethylethanolamine (DMEA) in a Packed Column

Abstract

To get a more accurate mass transfer coefficient model of CO 2 into aqueous monoethanolamine (MEA)/N,Ndimethylethanolamine (DMEA) solution in a packed column, the Henry's law constant, equilibrium CO 2 solubility, volumetric overall mass transfer coefficient (K G a v ), overall gas-phase mass transfer coefficient (K G ), and effective gas−liquid interfacial area (a v ) were comprehensively studied. The Henry's law constant was obtained using a jacketed stirred glass reactor, and the equilibrium CO 2 solubility was investigated using a bubbling absorption reactor. Additionally, the mass transfer performance was measured and evaluated experimentally in a packed column with DX-Type structured packing in terms of K G a v , K G , and a v . These experiments were conducted under the MEA/DMEA concentration of 6 kmol•m −3 with ratio of 5:1. The dynamic changes of solubility, species concentration, and absorption heat of solution were analyzed under different CO 2 loadings. The experimental results showed that the relationship of successive absorption without synergistic effect from the perspective of equilibrium state for the MEA/DMEA solution and the blended MEA/DMEA solution can reduce the CO 2 absorption heat compared to that of MEA solution. Furthermore, a predicted model of K G a v , which should be suitable for different solution systems with DX-Type structured packings in a packed column, was also proposed and developed based on the K G model and a v model in this work.

Dual-Functionalized Ionic Liquid Biphasic Solvent for Carbon Dioxide Capture: High-Efficiency and Energy Saving

“…Carbon dioxide (CO 2 ) is the main greenhouse gas, and its excessive emissions leads to many serious environmental problems. , Chemical absorption, especially amine-based solvents, such as 1-dimethylamino-2-propanol, , monoethanolamine (MEA)/ N , N -dimethylethanolamine (DMEA) blended solutions, and water-lean amine solvent, were proposed for CO 2 capture from the fossil fuel-fired power plants. However, the higher regeneration heat of the absorption process still limits the large-scale application. − To solve this problem, biphasic solvents come into being, in which the absorbent traps CO 2 to form a liquid–liquid − or solid–liquid phase. , Upon CO 2 loading or temperature variation, CO 2 enriched into one phase, which could significantly decrease the volume of the absorbent and then reduce the stripper size and energy penalty.…”

“…Carbon dioxide (CO 2 ) is the main greenhouse gas, and its excessive emissions leads to many serious environmental problems. 1,2 Chemical absorption, especially amine-based solvents, such as 1-dimethylamino-2-propanol, 3,4 monoethanolamine (MEA)/N,N-dimethylethanolamine (DMEA) blended solutions, 5 and water-lean amine solvent, 6 were proposed for CO 2 capture from the fossil fuel-fired power plants. However, the higher regeneration heat of the absorption process still limits the large-scale application.…”

A Review on the Recent Scientific and Commercial Progress on the Direct Air Capture Technology to Manage Atmospheric CO2 Concentrations and Future Perspectives

“…Amines are one of the most used solvents in absorption-based CO 2 capture processes . Conventionally, amines, ammoniated water, and alkali solvents were utilized for the said purpose; nevertheless, the development of newer absorbents can enhance the overall CO 2 capture efficiency . Several solvents such as diethanolamine (DEA), mono­ethanol­amine (MEA), methyl­diethanol­amine (MDEA) and di-iso­propanol­amine (DIPA) have been developed and extensively used .…”

CO2 Absorption/Desorption in Aqueous Single and Novel Hybrid Solvents of Glycerol and Monoethanolamine in a Pilot-Scale Packed Bed Column

“…3−5 One efficient method for CO 2 capture is the use of aqueous alkanolamine solutions or their mixtures. 4,6,7 Monoethanolamine (MEA), diethanolamine, and N-methyldiethanolamine 8,9 are conventional chemical absorbents. 1,4,10,11 Piperazine is commonly used as a blend with other amines because its absorption capacity for CO 2 and absorption rate 7,8 are approximately twice those of MEA and its energy requirements are approximately 15% less than those of MEA.…”

“…Carbon dioxide (CO 2 ) removal techniques have been extensively used in various parts of industries, for example, CO 2 capture from flue gas and natural gas purification. , Given the international aims to decrease greenhouse gas discharges, CO 2 capture from flue gas has attracted growing consideration in the last few years. − One efficient method for CO 2 capture is the use of aqueous alkanolamine solutions or their mixtures. ,, Monoethanolamine (MEA), diethanolamine, and N -methyldiethanolamine , are conventional chemical absorbents. ,,, Piperazine is commonly used as a blend with other amines because its absorption capacity for CO 2 and absorption rate , are approximately twice those of MEA and its energy requirements are approximately 15% less than those of MEA . Ionic liquids (ILs) can operate as independent solvents , and can also be consumed as activators for aqueous amines or other ILs .…”