High Throughput Screening of CO₂ Solubility in Aqueous Monoamine Solutions

Abstract

Post-combustion Carbon Capture and Storage technology (CCS) is viewed as an efficient solution to reduce CO(2) emissions of coal-fired power stations. In CCS, an aqueous amine solution is commonly used as a solvent to selectively capture CO(2) from the flue gas. However, this process generates additional costs, mostly from the reboiler heat duty required to release the carbon dioxide from the loaded solvent solution. In this work, we present thermodynamic results of CO(2) solubility in aqueous amine solutions from a 6-reactor High Throughput Screening (HTS) experimental device. This device is fully automated and designed to perform sequential injections of CO(2) within stirred-cell reactors containing the solvent solutions. The gas pressure within each reactor is monitored as a function of time, and the resulting transient pressure curves are transformed into CO(2) absorption isotherms. Solubility measurements are first performed on monoethanolamine, diethanolamine, and methyldiethanolamine aqueous solutions at T = 313.15 K. Experimental results are compared with existing data in the literature to validate the HTS device. In addition, a comprehensive thermodynamic model is used to represent CO(2) solubility variations in different classes of amine structures upon a wide range of thermodynamic conditions. This model is used to fit the experimental data and to calculate the cyclic capacity, which is a key parameter for CO(2) process design. Solubility measurements are then performed on a set of 50 monoamines and cyclic capacities are extracted using the thermodynamic model, to asses the potential of these molecules for CO(2) capture.

Prediction of thermodynamic properties of adsorbed gases in zeolitic imidazolate frameworks

“…These approaches emerge as credible alternatives to reduce the costs of developing new chemicals while helping to reduce their impact on man and environment. 10 The use of QSPR and other mathematical correlative methods in different industrial research areas from prediction of CO 2 capture by solvents, 11 jet fuel thermo-physical properties, 12 and modelling catalytic activity of gases in zeolites is in continuous expansion. DuPont, Dow Chemicals, etc.)…”

Effect of Chain Topology of Polyethylenimine on Physisorption and Chemisorption of Carbon Dioxide

“…[5] However,t his system is far from being optimal due to problems of corrosion, amine degradation and high energy consumption for regeneratingt he solutions. [6][7][8] Anchoring of polyamines onto solid supports hasb een proposed as an alternative to using aqueous solutions. In contrast to small amine scrubbers, solid-supported polymerica mines offer significant advantages for CO 2 capture, including the potential elimination of corrosion, alower energy cost for sorbent regeneration, and sufficiently low volatilities for avoiding excessive loss of activity.…”

Robust C–C bonded porous networks with chemically designed functionalities for improved CO2 capture from flue gas

“…COP-156-amine yields a total uptake of 7.8 wt %, which is 2.1 wt % more than COP-156. These CO 2 capacities are considerably higher than the industrial standard, monoethanolamine (MEA) (usually 2.1–5.5 wt %) [27–28]. …”