Reaction Kinetics of Carbon Dioxide with Diethanolamine in Polar Organic Solvents

Abstract

The chemical absorption rate of carbon dioxide with diethanoamine was measured in such nonaqueous solvents as methanol, ethanol, n-propanol, n-butanol, ethylene glycol, propylene glycol, and propylene carbonate, and in water at 298 K and 101.3 kPa using a semibatch stirred tank with a plane gas-liquid interface. The overall reaction rate constant obtained under the condition of fast reaction regime from the measured rate of absorption was used to get the elementary reaction rate constants in complicated reactions represented by reaction mechanism of carbamate formation and the order of overall reaction of CO 2 with amine. Correlation between the elementary reaction rate constant and the solubility parameter of the solvent was presented.

Mapping Diluents for Water-Lean Solvents: A Parametric Study

“…According to their findings, both k 2 and k b / k –1 generally decrease with a decrease in ε, arguably due to the destabilization of the amine carbamate brought about by shifting from aqueous to water-lean. This behavior was further observed by Park et al for DEA and MDEA , and by Hwang et al for diisopropanolamine (DIPA) …”

“…Meanwhile, we have adopted the approach suggested by Park et al 33 and Hwang et al 34 for calculating the amine diffusivity D B 0 in unloaded water-lean solvents. This approach consists of adapting the amine diffusivity from aqueous to water-lean based on how CO 2 diffusivity shifts between these two classes of solvents, as seen in eq 15.…”

“…This not only is convenient, but it has been assessed that the salting-out effect has a relatively low impact on the calculation of mass transfer rate coefficients. Therefore, rather than trying to fix the Sechenov equation by figuring out a new correlation, we have decided to consider the salting-out effect as a source of Values were not disclosed in Sada et al 19 but estimated by us through retroactively applying the same approach used by Park et al 33,36 and Hwang et al 34…”

An investigation of the role of N-methyl-diethanolamine in non-aqueous solution for CO2 capture process using 13C NMR spectroscopy

“…However, energy consumption has been demonstrated to be the key factor reducing the efficiency of power plants by many researchers (Chakma, 1995;Oexmann and Kather, 2010;Tan et al, 2011). Recently, non-aqueous solutions have been extensively investigated using organic solvents, such as methanol, ethanol, ethylene glycol (EG), diethylene glycol (DEG), triethylene glycol (TEG), diethylene glycol monomethyl ether (DGME), Nmethyl-2-pyrrolidone (NMP) and tributyl phosphate (TBP) (Leites, 1998;Jou et al, 2000;Park et al, 2005Park et al, , 2006aUsubharatana and Tontiwachwuthikul, 2009;Hwang et al, 2010;Tan et al, 2011), which provide significant advantages as for reducing solvent decomposition at high temperature and saving water evaporation energy in the CO 2 stripping process (Barzagli et al, 2013Yu et al, 2013.…”

Amine‐functionalization of the nanotitanate ETS‐2

“…It should also be considered that all of the adsorption experiments presented are run under rigorously anhydrous conditions and thus the amines cannot take advantage of moisture acting as a promoter to form carbamate ions. [29][30][31] The presence of a promoter could change the adsorption characteristics and/or rates compared to the data presented.…”