Investigations of carbon dioxide absorption into aqueous potassium carbonate solutions containing primary and secondary alkanolamines

Abstract

In the paper the results of measurements of CO 2 absorption rate in aqueous potassium carbonate solutions containing cyclohexylamine, diethanolamine, 2-methylaminoethanol and triethylenetetramine as activators have been presented. Enhnancement mass transfer factors as well as reaction rate constants have been determined. Results show that among the tested activators triethylenetetramine and 2-methyl-aminoethanol may be used (instead of diethanolamine) as new promotors in a modified BENFLIELD process.

Chemical and Process Engineering

“…The absorption model and the chemistry involved were described in detail in our previous paper (Bińczak et al, 2016). The values of the interfacial area and physical mass transfer coefficient in the liquid phase for the experimental conditions were determined in our earlier papers (Moniuk et al, 1997a;1997b).…”

“…For a fast, pseudo-first order chemical reaction (relevant criteria were presented in our earlier work (Bińczak et al, 2016)) the mass transfer coefficient with a chemical reaction is equal:…”

“…The first task was to check the compatibility of the present experimental technique with the laminar jet technique used in previous papers (Bińczak et al, 2018). To this end, measurements of the absorption rate of CO 2 into carbonate solutions activated by two single amines, diethanolamine and piperazine, were performed and the second order reaction rate constant, k Am was determined.…”

“…The activator was proposed for industrial use under the name of INS13. Before application in full industrial scale, it was first tested in a pilot plant consisting of two packed columns (carbon dioxide absorber and solvent regenerator-desorber) (Bińczak, 2015). The basic dimensions of these columns are shown in Table 5.…”

“…This paper is the third (and the last) of series of papers describing the results of a research program devoted to the investigation of new potential amine activators of carbon dioxide absorption in carbonate/bicarbonate solutions. In the former two papers (Bińczak et al, 2016;2018) a detailed description of the chemistry involved as well as methods of calculating results and a review of the relevant literature were given. In the first of the two papers the reaction kinetics of carbon dioxide with single amines was investigated for six aliphatic and cyclic amines.…”