Techno-economic assessment of postcombustion carbon capture using high-performance nanoporous single-layer graphene membranes

High-performance membranes have emerged as an energy-efficient alternative to absorption-based postcombustion carbon capture. So far, the techno-economic analyses been centered around polymeric membranes. Recently, nanoporous single-layer graphene (NSLG) yielded large CO 2 permeance, making them attractive for Herein, we assess feasibility of NSLG-based capture using optimized process. The most suitable system achieve recovery and purity 90% comprises a double-stage process with (i) recycle nd stage retentate, (ii) multi-staged vacuum pumps permeate, including roots in series liquid-ring intermittent condensers water vapor. high permeance NSLG makes without feed compression more economically competitive, even if area required is higher. Attractive penalties are estimated despite conservative membrane cost (500 $/m ): 41.2 31.8 $/ton CO2 from wet feeds concentration 10% 13.5%, respectively, corresponding energy penalty 1.53 1.24 MJ/kg . For steel cement industries where favorably (25%) but electricity also higher (0.10–0.20 $/kWh), ranges 28.0 46.0 Overall, analysis shows that competitive state-of-the-art processes • Economic verified. Double-stage 2nd retentate permeate best arrangement. than compression. Competitive found flue gas (13.5% ). ranging 10 25%.