This strongly indicates the need for further experimental and modelling studies on mass transfer rates in absorption columns (with higher viscosity liquids) to help directing the development of suitable DESs for pre-combustion CO 2 capture. However, when the liquid viscosity strongly affects the mass transfer rate, as is the case when using the Hanley and Chen (2012) correlations, the Selexol process remains more economical. When employing two of the three studied mass transfer correlations, the estimated process costs for a capture process using this DES can be similar to the costs of the Selexol process. The optimum capture cost for Selexol process is 27.22, 26.66 and 30.84 $ 2018/tonne CO 2 for the adopted correlations, respectively. The conventional Selexol process was set as the benchmark for the evaluation of the performances of these DESs. Using a high CO 2 solubility as criterion, two mixtures of allyl triphenylphosphonium bromide (ATPPB) and diethylene glycol (DEG) were screened out from literature. The solvent viscosity strongly affects the mass transfer rate when using the Hanley and Chen (2012) correlations, whereas it plays only a small role in the other two sets of correlations. The CO 2 solubility is found to be very important in all rate-based models, as expected, but properties such as the surface tension, thermal conductivity, heat capacity and volatility had a minor influence on the absorption performance.

A physical property study was conducted with this DES. Subsequently, property and process models were developed for a mixture of decanoic acid and menthol, in equal quantities. (1985), Billet and Schultes (1993) and Hanley and Chen (2012) were adopted for the rate-based models and compared with the equilibrium modelling approach. Different mass transfer correlations due to Bravo et al. The effects of the flow model and the number of segments were investigated for the Selexol process. A rate-based modeling approach was adopted to simulate pre-combustion CO 2 capture. The purpose of this paper is to identify firstly the most important solvent characteristics in the CO 2 capture process and secondly to determine how they contribute to the total cost of CO 2 separation and analyze the economic feasibility of current deep eutectic solvents (DESs) in literature.

Department of Chemical Engineering and Chemistry, Chemical Process Intensification, Eindhoven University of Technology, Eindhoven, Netherlands.

Kun Xin, Mahmoud Hashish, Ivo Roghair and Martin van Sint Annaland*

Aspen hysys depg model