Ming Tong

Comparison of absorption and regeneration performance for post-combustion CO2 capture by mixed MEA solvents

ABSTRACT In this work, the absorption performance, regeneration performance, and cyclic absorption capacity of three kinds of mixed monoethanolamine (MEA) solvents were studied compared to those of using MEA solvents alone in self-made apparatuses, including MEA-piperazine (PZ), MEA-potassium carbonate (K2CO3), and MEA-ammonia (NH3). The mixed solvent of 10 wt% MEA/5 wt% PZ has a similar absorption performance and a higher regeneration temperature compared with the 20 wt% MEA solvent. And the mixed solvent of 10 wt% MEA/5 wt% K2CO3 has the lowest initial absorption rate, but it has a better cyclic absorption performance and a longer effective reaction time. The mixed solvent of 10 wt% MEA/5 wt% NH3 has both a faster absorption rate and a lower regeneration temperature. These results prove that the mixed MEA solvent mixed with K2CO3 or NH3 has good potential to replace the MEA solvent alone with a lower energy consumption.

CO2 removal in a packed tower with two different fillers

ABSTRACT The present study investigated the CO2 capture characteristics of Structured mesh packing BX500 and Pall ring packing 16 × 16 in the absorption tower by using monoethanolamine-methanol solutions. Moreover, it studied the effects of CO2 loading, reaction temperatures, liquid flow rate, and gas flow rate on CO2 capture characteristics. Experimental results concluded that the excellent order of the two fillers was: Structured mesh packing BX500 > Pall ring packing 16 × 16. The absorption temperature at 321 K and the gas flow rate in 1.76 m3/h would be the best choice for CO2 capture process.

Absorption and regeneration characteristics of alkanolamines after CO2 removal from flue gas

ABSTRACT The investigations of CO2 absorption rate, absorption capacity, and removal efficiency in monoethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA), and nonaqueous MEA solutions were carried out to improve the absorption characteristics of the absorbents. The experiments were performed using a synthetic flue gas consisting of 15% CO2 with a flow rate of approximately 0.8 L/min. It was observed that 10 wt% MEA methanol solution had the fastest CO2 absorption rate of 8.03 × 10−5 mol/s. Furthermore, 10 wt% MEA methanol solution had the lowest regeneration temperature of 320 K.