Electrolyte NRTL (CO₂–AMP) property package

Same speciation model with 2-amino-2-methyl-1-propanol (AMP) constants — a hindered amine with a much weaker carbamate, so it can be pushed past MEA's ~0.5 mol CO₂/mol amine ceiling. Screening-grade: no independently published VLE dataset validates this system (unlike MEA's Jou-Otto-Mather anchor).