Effect of moisture on the heat capacity and the regeneration heat required for CO₂ capture process using PEI impregnated mesoporous precipitated silica

Abstract

In this study, we report the effect of the moisture of polyethylenimine (PEI) impregnated mesoporous precipitated silica used for CO2 adsorption on the heat capacity and the heat required to regenerate the adsorbent. The results indicate that the heat capacity of the absorbent increases as its moisture content increases. The increase in moisture results in the rise of the vaporization heat of water and the elevated heat capacity results in higher sensible heat. For these reasons, the total regeneration heat required for CO2 capture process increases significantly. The adsorbent has a maximum CO2 adsorption capacity at 75 °C. CO2 capture process using PEI impregnated mesoporous precipitated silica requires a minimum energy to regenerate the adsorbent; it reduces 46% of the energy compared to a process using an aqueous MEA 30 wt%, as the process operates at 75 °C.

Enhancement of carbon dioxide capture by amine‐modified rice husk mesoporous material

“…The maximum adsorption capacity was obtained at an influent CO 2 concentration of 100%v/v and at an adsorption temperature of 75°C as 1.70 mmol g −1 . These results agree with the adsorption capacity of the polyethylenimine‐impregnated mesoporous material .…”

Investigation of CO2 adsorption performance and fluidization behavior of mesoporous silica supported polyethyleneimine

“…The characteristics of dry N 2 gas, however, are much different with that of the flue gas, which contains a certain amount of water vapor. The PEI impregnated silica can adsorb the water from flue gas and changes the properties, the density in particular [22]. Increasing in the sorbent humidity will enhance the interaction among particles as well as the interaction between particles and column wall, which will cause the change in sorbent's fluidization characteristics.…”

“…As a result, there has been a strong interest to develop alternative more stable and less energy-intensive CO 2 removal technologies. Adsorption using solid sorbents [6][7][8][9], particularly amine-functionalized sorbents, is appealing due to their potentially lower energy requirements for sorbent regeneration [1,2,[10][11][12][13][14][15][16][17][18][19][20][21][22]. By immobilizing amine functionalities on high-surface porous solid supports, the amino solid sorbents offer higher amine efficiency and thus superior sorbent performance [18,19,23,24].…”

“…Generally, the heat of CO 2 adsorption is reduced due to the impregnation of amine solvents on a solid support. Because of low heat capacity, solid sorbent also requires less the sensible heat to raise temperature of adsorption bed to the regeneration temperature, however, the most significance of solid sorbent is the avoidance of solvent vaporization which could account for 30-50% of total regeneration energy [10,22,42].…”

CO2 adsorption testing on fly ash derived cancrinite‐type zeolite and its amine‐functionalized derivatives

“…Solid adsorption has several advantages over the conventional aqueous amine process, the most important of which is its lower costs due to its lower energy requirements . Solid sorbents may also eliminate the problem of corrosion and offer higher resistance to flue gas contaminants than aqueous systems .…”