Fig. 4: Triple-stage process with pyridinic- and PEI-graphene.
From: Energy- and cost-efficient CO2 capture from dilute emissions by pyridinic-graphene membranes
a, Specific energy as function of the molar fraction of CO2 Xperm,enricher with Pfeed,enricher of 1 bar or 2 bar. b, c, Evolution of capital cost with fixed Pfeed,enricher of 1 bar (b) and 2 bar (c) and the highest Xperm,enricher. d,e, Cost confidence intervals with fixed Pfeed,enricher of 1 bar (d) and 2 bar (e) and variable Xperm,enricher. Fixed operating conditions: P1d, 2–0.1 bar, P2d, 1–0.2 bar, recovery enricher = 90%, recovery and purity double stage = 95%. Sampling method: quasirandom Sobol sampling with size n = 6000. Error bars in b,c, indicate the mean ± range (min–max). Cost intervals in d,e, between 5th and 95th percentiles; line, mean.
