- Version
- Download 2
- File Size 192.08 KB
- File Count 1
- Create Date May 11, 2023
- Last Updated May 11, 2023
D3.4 CO2 separation and concentration of system integration - Executive Summary
In order to develop an efficient membrane contactor system for CO2 capture and concentration, modified membranes with improved CO2 selectivity from EUT's work (T2.2) were intended to be paired with functional ILs synthesized by IOL (T2.3). However, the reduction process using ionic liquids did not achieve satisfactory performance. As a result, it was decided to switch to a standard solution of potassium bicarbonate. Thus, a contactor unit was assembled using a flat sheet membrane in a crossflow module, with the membrane being placed between CO2 gas and 1M potassium bicarbonate solution.
Initially, gas to gas double-chamber testing was conducted on membranes similar to those with the best performance from WP2 to test the CO2 permeability. These results confirmed the findings of D2.5. Subsequently, the membranes with the best performance were utilized in a contactor where a gas mixture resembling the composition of flue gas was used in combination with a solution similar to that used in CO2 electrochemical reduction. The results showed the effectiveness of ILs in improving the permeability of polysulfone membranes. Moreover, contact with bicarbonate solution increased the membrane permeability by one order of magnitude, likely due to rapid liquid to liquid exchange between the ionic liquid in the membrane and the solution.