Carbon dioxide removal from flue gas using amine-based hybrid solvent absorption

Abstract

Flue gas released from most industries through the combustion of fossil fuels contained approximately 80 % N2, 15 % CO2, 5 % O2. It is considered to contribute greatly to the global warming. The objective of this study was to investigate the performance of hybrid solvents blended between primary, secondary, or tertiary amines (monoethanolamine (MEA), diethanolamine (DEA), or triethanolamine (TEA), respectively) and piperazine (PZ) for CO2 removal from flue gas in terms of CO2 absorption capacity and regeneration efficiency at different regeneration temperatures. The CO2 absorption was examined at atmospheric pressure and room temperature. The results showed that MEA blend with PZ provided a maximum CO2 absorption capacity of 0.50 mol CO2/mol amine while TEA gave the minimum CO2 absorption capacity of 0.30 mol CO2/mol amine. The regeneration of TEA at 100 °C gave the highest regeneration efficiency in both the first cycle (97.7%) and second cycle (95.2%) with less loss of absorption capacity.