Capture of CO₂ by highly concentrated alkanolamine solutions in a rotating packed bed

Abstract

The capture of CO2 in a rotating packed bed (RPB) using highly concentrated alkanolamine solutions has been proved to be an effective way to enhance the absorption efficiency of CO2. In this investigation, the effects of alkanolamine concentration on the CO2 removal efficiency and mass transfer coefficients (KGa) at various lean CO2 loadings were studied. Monoethanolamine and 2‐methyl‐amino‐ethanol solutions were used to absorb CO2 in an RPB. Experimental results showed that increasing the alkanolamine concentration effectively enhanced the CO2 absorption efficiency of a fresh absorbent. For an absorbent with a high CO2 loading, an optimal alkanolamine concentration was observed because the viscosity of the absorbent dramatically increased at high alkanolamine concentration and high CO2 loading. A correlation of KGa was proposed and the mass transfer coefficient can be expressed as a function of the free alkanolamine concentration and the viscosity of the absorbent.

Process Modeling of CO2 Absorption with Monoethanolamine Aqueous Solutions Using Rotating Packed Beds

“…Conventional CO 2 chemical absorption processes with packed beds (PB) require excessive packing volume in the CO 2 absorber due to the large mass transfer resistance across the gas–liquid interface . As a process intensification alternative to PB, rotating packed beds (RPB) have been experimentally investigated by many researchers for their use in CO 2 capture with chemical absorption. − Moreover, extensive process simulation efforts for CO 2 capture with RPB have been reported to capture process fundamentals of CO 2 chemical absorption and to predict CO 2 removal efficiency. ,− …”

Modification g‐C3N4 by MgO and its application for glycerol carbonate synthesis from glycerol and dimethyl carbonate

“…Butanol was used as the internal standard. Conversion of GLY, GC selectivity, and yield of GC were calculated using the following equations 2,19 : …”

“…However, these catalysts also had some disadvantages such as poor reusability, high molar ratio of DMC/GLY, and leaching of metal ions. In addition, KF‐based catalyst such as KF/hydroxyapatite and KF/Al 2 O 3 categorized in toxic materials 2,19 …”

“…With increasing energy demands and CO 2 emission, biodiesel production methods have been developed because of their renewable feedstocks and low CO 2 emission. [1][2][3] Triglycerides are known as raw materials for the production of biodiesel in significant amounts, because of easy and global availability from animal fats or vegetable oils. 4,5 During biodiesel production from triglycerides, glycerol (GLY) is always coproduced in about 10 wt %.…”

“…In addition, KF-based catalyst such as KF/hydroxyapatite and KF/Al 2 O 3 categorized in toxic materials. 2,19 Recently, nitrogen-based carbon materials such as nitrogendoped carbon nanotubes have developed to use as base catalysts in organic reactions 20 ; however, the catalytic activity of these materials was not significant. Among several carbon-nitrogen based materials, graphitic carbon nitrogen (g-C 3 N 4 ) have appealed immense attention for various applications such as supercapacitors, flameretardants, photocatalyst, and wastewater treatment.…”