The reaction conversion (90%) and selectivity (100%) were the same as that of IPA TCD for a direct comparison. The product stream was first introduced to a flash to separate the obtained hydrogen gas from the liquid electrolyte. The flash was modelled to obtain H2 with a purity of 95wt%, same as that of the IPA TCD process. The carbon emissions from the electrochemical dehydrogenation reaction arise from the distillation process. The distillation model was simulated using Aspen Plus (Figure and Figure ) to enable the carbon footprint estimations for the separation process. The distillation feed stream was modelled to have ECD reaction products comprising of acetone, unreacted IPA and electrolyte. Two simulations were performed, one with water as the electrolyte and the other one with 1M aqueous KOH electrolyte. The distillation column was also modelled as a RadFrac with 40 stages where the feed was fed above stage 20. To keep the purity of acetone consistent throughout varying the electrolyte amount, the distillate rate and reflux ratio were set at 1.1kmol/hr and range of 0.4-0.55, respectively. The acetone product was obtained from the distillate with a mass fraction of 0.9 which is the same as the thermochemical dehydrogenation process. For the simulations using 1M KOH alkaline solution, the carbon footprint of KOH was also considered where 1.8kg of CO2 is released for a kg of KOH. For the ECD of 2M IPA with water as the electrolyte, the carbon footprint associated with the process was 5.8kgCO2/kg H2 released which was all associated with the separation process. When ECD was performed using 1M aqueous KOH electrolyte, the carbon footprint increased five times to 29.2kgCO2/kg H2 released, as shown in Table . The carbon footprint of the upstream processes for producing KOH or other solvents will largely determine the overall carbon emissions for electrochemical LOHC cycling and methods requiring green solvents or electrolytes to be investigated and developed. The carbon footprint of 2M IPA ECD under neutral conditions is almost twice that of the IPA TCD process. However, at concentrations greater than 6M IPA, the ECD carbon footprint becomes lower than that of the TCD process. More information regarding the calculations to obtain the carbon footprint of IPA ECD is available in the supplementary information of this report.