scholarly journals Fast and efficient CO2 absorption in non-aqueous tertiary amines promoted by ethylene glycol

2021 ◽  
Author(s):  
Meisi Chen ◽  
Feng Zhang ◽  
Xiemin Liu ◽  
Xingbang Hu ◽  
Youting Wu
Keyword(s):  
Mass Fraction ◽  
Absorption Rate ◽  
Normal Pressure ◽  
Co2 Absorption ◽  
Tertiary Amines ◽  
Absorption Performance ◽  
Regeneration Cycle ◽  
Higher Temperature ◽  
Regenerative Energy ◽  
C Nmr

With the catalytic induction of EG, anhydrous DMEA shows CO absorption performance via chemical binding and physical storage under normal pressure. Among the absorbents, pure DMEA can hardly absorb CO directly but when the zwitterionic alkylcarbonates are formed between CO and DMEA-EG which can be characterized by C NMR and FTIR, the absorption rate of CO will be improved at this time. An increasing the CO loading as the mass fraction of EG in DMEA-EG, 90wt.% EG captures up to 0.72 mol/mol. The amount of chemically bound and physically stored is directly dependent on temperature, within the range of 293 to 323K, an absorption-regeneration cycle can be formed in a closed vessel because of the zwitterion DMEA-EG-CO is unstable at the higher temperature. In other words, DMEA-EG-CO can be easily regenerated upon appropriate depressurization or heating, corresponding thermodynamic calculations prove that the regenerative energy of DMEA-EG-CO is 25.49kJ/mol.

Experiments on the Kinetics of CO2 Loaded MDEA-DEA Aqueous Solution

2014 ◽  
Vol 955-959 ◽  
pp. 2306-2309
Author(s):  
Shu Bin Zhao ◽  
Pan Zhang ◽  
Xiao Tong Cai ◽  
Dong Fu
Keyword(s):  
Aqueous Solution ◽  
Mass Fraction ◽  
Absorption Rate ◽  
Normal Pressure ◽  
Influence Of Temperature ◽  
Kinetics Of

The absorption rates of CO2 in diethanolamine (DEA) promoted N-methyldiethanolamine (MDEA) aqueous solution were measured at normal pressure with temperatures ranging from 303.15-323.15K. The influence of temperature and the mass fraction of DEA on the absorption rate of CO2 was illustrated.

Experiments on the Kinetics and Activation Mechanism of CO2 Loaded MEA-MDEA Aqueous Solutions

2012 ◽  
Vol 610-613 ◽  
pp. 1213-1217 ◽  
Author(s):  
Dong Fu ◽  
Lin Wei ◽  
Xiang Fei
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Mass Fraction ◽  
Absorption Rate ◽  
Normal Pressure ◽  
Activation Mechanism

The solubility and absorption rate of CO2 in monoethanolamine (MEA) promoted N-methyldiethanolamine (MDEA) aqueous solution were measured at normal pressure with temperatures ranging from 303.15-323.15K. The temperature and the mass fraction dependences of the solubility of CO2 and CO2 loading were determined. The influence of the mass fraction of MEA on the absorption rate of CO2 was illustrated.

Experiments on the Kinetics and Solubility of CO2 in AMP-PZ Aqueous Solutions

2013 ◽  
Vol 411-414 ◽  
pp. 2989-2992
Author(s):  
Dong Fu ◽  
Hong Mei Wang ◽  
Lei Xia Du
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Mass Fraction ◽  
Absorption Rate ◽  
Normal Pressure

The solubility and saturated loading of CO2in piperazine (PZ) promoted 2-amino-2-methyl-1-propanol (AMP) aqueous solution were measured at normal pressure with temperatures ranging from 293.15K to 323.15K. The temperature and the mass fraction dependences of the solubility and saturated loading of CO2were determined. The influence of the mass fraction of PZ on the absorption rate of CO2was illustrated.

Molecular insights into the enhanced rate of CO2 absorption to produce bicarbonate in aqueous 2-amino-2-methyl-1-propanol

2017 ◽  
Vol 19 (47) ◽  
pp. 32116-32124 ◽  
Author(s):  
Haley M. Stowe ◽  
Gyeong S. Hwang
Keyword(s):  
Absorption Rate ◽  
Co2 Absorption ◽  
Tertiary Amines ◽  
Sterically Hindered ◽  
Sterically Hindered Amine

Facile reorganization of H2O molecules surrounding N of sterically hindered amine 2-amino-2-methyl-1-propanol, relative to tertiary amines, enhances CO2 absorption rate.

Carbon Capture From Natural Gas via Polymeric Membranes

2018 ◽  
pp. 3043-3055
Author(s):  
Nayef Mohamed Ghasem ◽  
Nihmiya Abdul Rahim ◽  
Mohamed Al-Marzouqi
Keyword(s):  
Liquid Phase ◽  
Low Temperature ◽  
Gas Flow ◽  
Polymeric Membrane ◽  
Co2 Absorption ◽  
Membrane Contactor ◽  
Liquid Temperature ◽  
Liquid Phase Boundary ◽  
Key Factor ◽  
Absorption Performance

Polymeric membrane is a promising energy effective and an active alternative for conventional CO2 absorption column. The type of absorption liquid and operating parameters plays an efficient role in the ultimate absorption/stripping performance using gas-liquid membrane contactor. The gas flow rate has a significant effect on CO2 absorption performance, by contrast, it has no effect on stripping performance. Further the CO2 absorption performance in membrane contactor could be enhanced by high liquid flow rates. Because the gas–liquid contact time was a key factor to enhance the stripping flux at low temperature while liquid phase boundary layer thickness and associated mass transfer resistance is important at elevated temperature. So by controlling the liquid phase velocity and the length of module at low temperature better stripping performance can be achieved. The effect of liquid temperature on absorption performance in gas-liquid is not straightforward, since the liquid temperature cooperatively influence several factors.

Numerical Investigation of the Thermo-Hydraulic Characteristics for Annular Vortex Tube: A Comparison With Ranque–Hilsch Vortex Tube

2020 ◽  
Vol 142 (11) ◽  
Author(s):  
Milad Khosravi ◽  
Meisam Sadi ◽  
Ahmad Arabkoohsar ◽  
Amir Ebrahimi-Moghadam
Keyword(s):  
Mass Fraction ◽  
Vortex Tube ◽  
Secondary Circulation ◽  
Outlet Section ◽  
Separation Performance ◽  
Outlet Temperature ◽  
Hydraulic Characteristics ◽  
Temperature Separation ◽  
Mass Fractions ◽  
Higher Temperature

Abstract In this work, a new configuration of the vortex tubes (VTs), called annular VTs, is proposed to improve the temperature separation performance. In the proposed configuration, a compartment has been added on the top of the tube wall that the separated hot outlet is repassed inside it over the hot tube. An axisymmetric swirl model of the Ranque–Hilsch (RH) and annual VTs is numerically simulated, and the thermo-hydraulic characteristics of them are compared for cold mass fractions ranging 0.2–0.8. The results illustrated that a small secondary circulation is created near the cold outlet of the RHVT that is not observed in the annular model. This secondary circulation is a destructive mechanism in VTs that results in more mixing and higher temperature in the cold outlet section. Analyzing the results indicates that using annular VT causes up to 12.51% increment of the hot outlet temperature compared to the RHVT model (which occurs at a mass fraction of 0.23). Also, up to 9.23% reduction of the cold outlet temperature is occurred (which occurs at a mass fraction of 0.37). These explanations prove the improvement of the annular VT compared to that of the conventional VTs.

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