Mass Transfer Performance of CO₂ Absorption into Aqueous Solutions of 4-Diethylamino-2-butanol, Monoethanolamine, and N-Methyldiethanolamine

Abstract

The mass transfer performance of the absorption of CO 2 in an aqueous solution of monoethanolamine was evaluated experimentally in a lab-scale absorber packed with high efficiency DX structured packing and compared with that of methyldiethanolamine (MDEA) as well as that of a newly developed tertiary amino alcohol, 4-diethylamino-2-butanol (DEAB). The absorption experiments were conducted at atmospheric pressure, using a feed gas mixture containing 14.9% CO 2 and 85.1% nitrogen in an absorption column containing DX structured packing. The absorption performance was presented in terms of the CO 2 removal efficiency, absorber height requirement, effective interfacial area for mass transfer, and overall mass-transfer coefficient (K G a v ). In particular, the effects of parameters such as inert gas flow rate and liquid flow rate were compared for both DEAB and MDEA. The results show that the DEAB has a much higher removal efficiency for CO 2 along the height of the column than MDEA. Also, the K G a v of DEAB was much higher than that for MDEA. For all the solvents, the K G a v increased as the liquid flow rate was increased. An empirical correlation for the mass transfer coefficient for the CO 2 -DEAB system has been developed as a function of the process parameters. In terms of comparison, the results show that the DEAB system provided an excellent overall mass transfer coefficient, which is higher than that of the MDEA system but less than that of MEA.

High pressure CO2 absorption from natural gas using piperazine promoted 2-amino-2-methyl-1-propanol in a packed absorption column

“…Thus, it can be concluded that the liquid flow rate may have significantly affected the mass transfer performance. These observations have also been documented in other CO 2 absorptions studies, both at atmospheric conditions [30][31][32][33][34][35][36][37][38][39][40] and at high pressure conditions [21].…”

Mass transfer performance and correlations for CO2 absorption into aqueous blended PG/MEA in PTFE membrane contactor

“…For a fast chemical reaction, the value of y A,G* is very close to zero and usually can be neglected in the amine-based CO 2 absorption process. [28][29][30][31] Therefore Eqn (5) can be simplified as…”

Computer-aided molecular design and selection of CO2 capture solvents based on thermodynamics, reactivity and sustainability

“…Maneeintr et al 14 Naami et al 15 Shi et al 16 Equilibrium solubility and reaction kinetics Equilibrium solubility and cyclic capacity Mass transfer coefficient in packing material Vapour liquid equilibrium model An examination of the solvents in class C shows that:…”

“…For instance, the laboratory-based investigation of DEAB has required extensive effort as reflected in publications related to compound identification 11,12 and investigation [13][14][15][16] . Thus, in addition to acquiring high-quality data for different solvents, there is a need to accelerate the search using computational methods 17 .…”