The reaction was also assumed to undergo 100% faradaic efficiency meaning all the electric energy supplied is going towards the acetone ECH reaction. The reactions were modelled at 25°C and 0.1MPa, removing the need of heating the reactor or the feed stream. Assuming the application of renewable electricity to drive the reaction, the acetone ECH carbon footprint was calculated as 0.8kg CO2/kg H2 stored. However, this value is incomplete considering there may be a need to purify the LOHC product for other uses or in a case where ECD will be required to be performed in a different electrolyte. Transportation or storage may also be more economical at higher concentrations. product stream was obtained from an Aspen Plus simulation model and assuming natural gas combustion as the heating source. The distillation feed stream was comprised of IPA, unreacted acetone and water. The water amount was varied to target the desired initial concentration of acetone. The distillation feed stream was at 25℃ and 0.1MPa. The distillation column was modelled as a RadFrac (Figure and Figure ) containing 40 trays and the feed entering above stage 10. The distillate rate was 1.52kmol/hr and the reflux ratio was 2.5. The IPA product was obtained from the distillate (TOP1) forming an azeotropic mixture with water. The IPA mass fraction at the distillate product was 0.848 at 79℃. The bottom product stream (BOT1) contained water and trace amounts of IPA and unreacted acetone. The amount of energy required for the separation process for 2M acetone ECH was 372000kJ/hr. Further purification can be performed using a liquid entrant such as ethylene glycol or dimethyl sulfoxide (DMSO) to obtain IPA purity as high as 99wt.%. However, the use of such solvents will come at cost of carbon emissions considering their upstream processes, so were not utilized. The overall carbon footprint for 2M acetone ECH with distillation was 23.7kg CO2/kg H2 stored (0.34kg CO2/kg IPA produced) which is about 30 times more than ECH without separation as shown in Table . Furthermore, the 2M acetone ECH carbon footprint was 10 times greater than that of the corresponding TCH process when separations were included. Product separation from the electrolyte solution is the main factor attributing to larger CO2 emissions in acetone ECH. Detailed calculations for the acetone ECH carbon footprint are available in the supplementary information.