MDEA bulk CO2 removal from shifted syngas

Bulk CO2 removal ahead of a hydrogen or ammonia unit on N-methyldiethanolamine, the tertiary amine that forms no carbamate and so carries up to one mole of CO2 per mole as bicarbonate: 200 mol/s of shifted syngas (18% CO2, 70% H2) at 30 bar against 450 mol/s of 45 wt% MDEA (11 mol%), regenerated at 1.8 bar with steam. The enrtl-mdea package uses the proton-acceptor speciation only. What it computes: the treated syngas at 85% H2 / 12% CO with the CO2 gone, a rich loading of 0.75 mol/mol, a 37 mol/s CO2 product at 94 mol% and 2.7 MW on the rich heater. Bounds: Kremser stages (the K at the entering liquid, so the absorber captures to completion where a real MDEA absorber is kinetically slow and leaves a slip), open loop, and the loading model caps at 0.99 — the solvent rate is set so the rich end stays well below it, because past the cap the model keeps absorbing.