CO2 absorption in biphasic solvents with enhanced low temperature solvent regeneration

1-Cyclohexylpiperidine as a thermolytic draw solute for osmotically driven membrane processes

“…Previous models of thermolytic draw solute removal [37] may have been overly optimistic in light of more recent experimental results [18,19]. The concentration dependence of the CO 2 removal from amines is better highlighted in the carbon capture literature [38][39][40][41][42][43]. In the case of DMCHA at full concentration it started degassing as early as 25°C, requiring viscosity measurements to be made at 15°C, however as will shortly be illustrated DMCHA requires nearly reflux conditions to fully remove the CO 2 content.…”

Novel Thermomorphic Biphasic Amine Solvents for CO2 Absorption and Low-Temperature Extractive Regeneration

“…However, the slow absorption rate of DMCA and precipitation of DPA bicarbonate were clear shortcomings of these solvents. An improved thermomorphic biphasic solvent (TBS) system, the so-called activated dimethylcyclohexylamine (a-DMCA), has recently been developed to overcome these drawbacks [10]. It comprises DMCA as the main absorbent with outstanding regeneration characteristics and an alkylamine A1 as an activator, exhibiting an extremely rapid absorption rate.…”

Carbon dioxide absorption into biphasic amine solvent with solvent loss reduction

“…Owing to the advantages of utilising liquid-liquid phase separation (LLPS), a new CO 2 capture technology DMX TM process has also been developed by IFP Energies nouvelles for reducing the energy consumption by ∼40% with separating the regenerated amine from aqueous phase in decanter before steam stripping (Raynal et al, 2010). Moreover, the TBS system used in this project has proved regeneration process can be enhanced dramatically by LLSP, with over 90% of the absorbed CO 2 being released without steam stripping in a bench-scale unit (Zhang et al, 2010). Solvent losses in amine based gas treating plants stem from vaporisation, mechanical breakdown, entrainment, foaming and chemical degradation processes (Kohl and Nielsen, 1997).…”