Abstract
Thermally degraded diglycolamine® (DGA®)/dimethylaminoethoxyethanol (DMAEE) was found to have a better performance for CO2 capture than the fresh, undegraded solvent. At high temperature, DGA®/DMAEE reaches equilibrium with its major degradation product, methylaminoethoxyethanol (MAEE). The production of MAEE enhances the CO2 absorption rate, while maintaining the CO2 capacity of the original solvent. The normalized CO2 cyclic capacity of DGA®/MAEE/DMAEE is substantially greater than that of 7 m monoethanolamine (MEA) and 10 m DGA®, and comparable to 5 m piperazine (PZ). The average CO2 absorption rate of DGA®/MAEE/DMAEE is 30–70% higher than 7 m MEA, although it is still much lower than 5 m PZ. The heat of CO2 absorption (ΔHabs) for 1.75 m DGA®/1.75 m MAEE/3.5 m DMAEE at CO2 loading corresponding to PCO2* of 1.5kPa at 40°C is 72kJ/mol, which is comparable to 7 m MEA, and greater than 5 m PZ.
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