Triacetoneamine-derivates (EvAs) for CO2-absorption from Process Gases

Abstract

New amines for reactive absorption of CO2 from process gases were investigated in a comprehensive experimental screening. All studied amines are derivates of triacetoneamine and differ only in the substituent of the triacetoneamine ring structure. The amines are abbreviated by the acronym EvA with a consecutive number, designating the derivate. About 50 EvAs were considered in this work from which 26 were actually synthesized and investigated in aqueous solution.The following properties were studied: solubility of CO2, rate of absorption of CO2, liquid–liquid and solid–liquid equilibrium, foaming behavior, dynamic viscosity, and acid constants. The nine most promising EvAs were evaluated with the NoVa short-cut method (Vasiliu et al., 2020). The method yields estimates for the specific energy demand and recirculation rate for a given purification task. Two typical purification tasks were considered: the CO2-removal from natural gas and from synthesis gas, respectively. Some of the EvAs showed significantly improved performance compared to monoethanolamine (MEA) and a solvent-blend of methyl-diethanolamine and piperazine (MDEA/PZ).

Speciation in CO2-loaded Aqueous Solutions of Sixteen Triacetoneamine-derivates (EvAs) and Elucidation of Structure-property Relationships

“…The results of the present work and of a previous work of our group [50] indicate that carbamates and alkylcarbonates are stabilized by the formation of H-bond and zwitterionic stabilized ring structures. Even though no direct evidence for the existence of such ring structure was found, the obtained results strongly indicate that they can be formed.…”

“…From combining the information from both steps, some guidelines for the design of new amines were derived. Some preliminary results of this procedure have already been described briefly in a conference paper [50], which, however, only contains fragments of the information that is presented here in Section 4.3.…”

“…A particularly interesting class of amines for a systematic study on the speciation in unloaded and CO 2 -loaded aqueous solutions of amines are derivates of triacetoneamine, the so-called EvAs, which are known to be promising new solvents for CO 2 -absorption [30,47,49,50]. The EvAs share the triacetoneamine ring structure but differ in one substituent.…”

Role of aromatic ring spacer in homo‐coupled conjugated microporous polymers in selective CO2 separation

“…These properties of CMP‐A are considerably important from the view of high and selective CO 2 uptake. Thus it can conclude that, adsorbent with aromatic ring framework containing no spacer offers suitable properties required for selective CO 2 capture 34,35,37 …”

“…Thus it can conclude that, adsorbent with aromatic ring framework containing no spacer offers suitable properties required for selective CO 2 capture. 34,35,37…”