| VISCOSITY of MOLTEN SALTS to CAPTURE CO2 Stanislaw Pietrzyk1; Piotr Palimaka2; 1AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, Kraków, Poland; 2AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, Krakow, Poland; PAPER: 390/AdvancedMaterials/Keynote (Oral) SCHEDULED: 15:55/Mon. 28 Nov. 2022/Saitong ABSTRACT: Carbon capture and storage (CCS) by method Ca-looping is based on carbonation of CaO (CO<sub>2</sub> absorption), and calcination of the formed CaCO<sub>3</sub> (CO<sub>2</sub> desorption) [1]. A great challenge for this method is the decreasing sorbent reactivity after many absorption–desorption cycles [2]. Avoidance of sorbent degradation and reduction of its efficiency is possible thanks to a process known as carbon capture in molten salts (CCMS) [3]. The most promising salt mixture is eutectic CaCl<sub>2</sub>-CaF<sub>2 </sub>[4]. The CaO -CaCl<sub>2</sub>-CaF<sub>2</sub> solutions are expected to form a suspension due to supersaturation in CaO. This can lead to an increase in viscosity, which can be a challenge in an enlarged CCMS installations where a possible approach is to transport molten salts between the absorption and desorption chambers [5]. Unfortunately, data on the viscosity of such solutions are lacking. In order to check these possible limitations, an experimental evaluation of the viscosity of the CaCl<sub>2</sub>-CaF<sub>2</sub>-CaO systems was performed. Viscosity measurements were carried out with a high-temperature rotary rheometer. The results showed that increasing the CaO content and lowering the melt temperature increases the viscosity. Comparing the salt viscosity with the 30% addition of CaO and without its addition, the relative increase in viscosity at the temperatures of 750 and 950 <sup>0</sup>C was over six and five times more , respectively. The obtained viscosity results in the temperature range of 750-950<sup>0</sup>C and for the additive up to 30 wt.% CaO did not exceed the value of 30 cP, which proves that the cyclic transport of salt between the reactor chambers will not be hindered. References: [1] N. MacDowell, N. Florin, A. Buchard, J. Hallett, A. Galindo, G. Jackson, C. S. Adjiman, C. K. Williams, N. Shah, P. l. Fennell, Energy Environ. Sci. 3 (2010) 1645–1669. [2] J. Blamey, E.J. Anthony, J. Wang, , P.S. Fennell, Prog. Energy Combust. Sci. 36 (2010) 260–279. [3] V. Tomkute, A. Solheim, E. Olsen, Energy Fuels 27 (2013) 5373–5379. [4] V. Tomkute , A. Solheim, E. Olsen, Energy Fuels 28 (2014) 5345–5353 [5] E. Olsen, Patent No. US 8,540,954 B2, Sep. 24, (2013). |
